9 Apr
2014
9 Apr
'14
5:51 p.m.
Hi All,
I have been experiencing a deadlock when a timeout occurs on a t_relayed()
INVITE. Going through the code I have noticed a possible chance of deadlock
(without re-entrant enabled). Here is my thinking:
t_should_relay_response() is called with REPLY_LOCK when the timer process
fires on the fr_inv_timer (no response from the INVITE that was relayed,
other than 100 provisional) and a 408 is generated. However, from within
that function there are calls to run_failure_handlers() which in turn
*could* try and lock the reply (viz. somebody having a t_reply() call in
the cfg file - in failure route block). This would result in another lock
on the same transaction's REPLY_LOCK....
Has anybody else experienced something like this?
this is on master btw.
Cheers
Jason
9 Apr
9 Apr
9:34 p.m.
Hello,
that should not be a very rare case and I would expect to be caught so
far, anyhow ... this looks like easy to reproduce, have you tried it?
You can have two kamailio, one relying the invite to the second, which
will reply with 100, then wait for the timeout on the first instance.
You can add some debug messages in the code to see if the lock is called
twice.
Cheers,
Daniel
On 09/04/14 17:51, Jason Penton wrote:
Hi All,
I have been experiencing a deadlock when a timeout occurs on a
t_relayed() INVITE. Going through the code I have noticed a possible
chance of deadlock (without re-entrant enabled). Here is my thinking:
t_should_relay_response() is called with REPLY_LOCK when the timer
process fires on the fr_inv_timer (no response from the INVITE that
was relayed, other than 100 provisional) and a 408 is generated.
However, from within that function there are calls
to run_failure_handlers() which in turn *could* try and lock the reply
(viz. somebody having a t_reply() call in the cfg file - in failure
route block). This would result in another lock on the same
transaction's REPLY_LOCK....
Has anybody else experienced something like this?
this is on master btw.
Cheers
Jason
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
10:32 p.m.
Hey Daniel,
Yes I did a test with a very basic config file and I am not able to
re-create. However, with my *complex* cfg file I can re-create every time.
Tomorrow I will compare what is different and report back... hopefully with
fix ;)
here is bt of timer process deadlocking itself:
#0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
#1 0x00007f5009f22004 in futex_get (lock=0x7f4fc55030d8) at
../../mem/../futexlock.h:123
#2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8, file=0x7f5009f90fd1
"t_cancel.c", function=0x7f5009f91980 "cancel_branch", line=250) at
lock.h:99
#3 0x00007f5009f23271 in cancel_branch (t=0x7f4fc5501b40, branch=0,
reason=0x7fff646d03a8, flags=3) at t_cancel.c:250
#4 0x00007f5009f22c02 in cancel_uacs (t=0x7f4fc5501b40,
cancel_data=0x7fff646d03a0, flags=1) at t_cancel.c:123
#5 0x00007f5009f718c4 in _reply_light (trans=0x7f4fc5501b40,
buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR select next
S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
SIP/2.0/UDP 10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"..., len=778,
code=500, to_tag=0x7f500a1c7ae0 "c82b15d7f12ef185f95fe4945457d449-8bab",
to_tag_len=37, lock=0, bm=0x7fff646d0b60) at t_reply.c:660
#6 0x00007f5009f7244c in _reply (trans=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
select next S-CSCF", lock=0) at t_reply.c:795
#7 0x00007f5009f76436 in t_reply_unsafe (t=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
select next S-CSCF") at t_reply.c:1643
#8 0x00007f5009f57621 in w_t_reply (msg=0x7f500a1c6bc0, p1=0x7f500a2497d8
"\340\332$\nP\177", p2=0x7f500a249870 "h\321$\nP\177") at tm.c:1324
#9 0x000000000041a700 in do_action (h=0x7fff646d1d30, a=0x7f500a24cee8,
msg=0x7f500a1c6bc0) at action.c:1119
#10 0x0000000000423831 in run_actions (h=0x7fff646d1d30, a=0x7f500a24cee8,
msg=0x7f500a1c6bc0) at action.c:1607
#11 0x000000000041a5a4 in do_action (h=0x7fff646d1d30, a=0x7f500a24d478,
msg=0x7f500a1c6bc0) at action.c:1102
#12 0x0000000000423831 in run_actions (h=0x7fff646d1d30, a=0x7f500a249148,
msg=0x7f500a1c6bc0) at action.c:1607
#13 0x000000000041a54e in do_action (h=0x7fff646d1d30, a=0x7f500a24c500,
msg=0x7f500a1c6bc0) at action.c:1098
#14 0x0000000000423831 in run_actions (h=0x7fff646d1d30, a=0x7f500a247a28,
msg=0x7f500a1c6bc0) at action.c:1607
#15 0x0000000000423fdf in run_top_route (a=0x7f500a247a28,
msg=0x7f500a1c6bc0, c=0x0) at action.c:1693
#16 0x00007f5009f73815 in run_failure_handlers (t=0x7f4fc5501b40,
rpl=0xffffffffffffffff, code=408, extra_flags=96) at t_reply.c:1061
#17 0x00007f5009f7527a in t_should_relay_response (Trans=0x7f4fc5501b40,
new_code=408, branch=1, should_store=0x7fff646d201c,
should_relay=0x7fff646d2018, cancel_data=0x7fff646d2070,
reply=0xffffffffffffffff) at t_reply.c:1416
#18 0x00007f5009f76ede in relay_reply (t=0x7f4fc5501b40,
p_msg=0xffffffffffffffff, branch=1, msg_status=408,
cancel_data=0x7fff646d2070, do_put_on_wait=0) at t_reply.c:1819
#19 0x00007f5009f44c88 in fake_reply (t=0x7f4fc5501b40, branch=1, code=408)
at timer.c:354
#20 0x00007f5009f450e7 in final_response_handler (r_buf=0x7f4fc5501e60,
t=0x7f4fc5501b40) at timer.c:526
#21 0x00007f5009f4518d in retr_buf_handler (ticks=260027386,
tl=0x7f4fc5501e80, p=0x3e8) at timer.c:584
#22 0x0000000000544119 in timer_list_expire (t=260027386, h=0x7f4fc527cbe0,
slow_l=0x7f4fc527cdf0, slow_mark=0) at timer.c:894
#23 0x0000000000544418 in timer_handler () at timer.c:959
#24 0x00000000005446b2 in timer_main () at timer.c:998
#25 0x0000000000471ddf in main_loop () at main.c:1689
On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin Mierla
<miconda(a)gmail.com>wrote;wrote:
Hello,
that should not be a very rare case and I would expect to be caught so
far, anyhow ... this looks like easy to reproduce, have you tried it?
You can have two kamailio, one relying the invite to the second, which
will reply with 100, then wait for the timeout on the first instance. You
can add some debug messages in the code to see if the lock is called twice.
Cheers,
Daniel
On 09/04/14 17:51, Jason Penton wrote:
Hi All,
I have been experiencing a deadlock when a timeout occurs on a
t_relayed() INVITE. Going through the code I have noticed a possible chance
of deadlock (without re-entrant enabled). Here is my thinking:
t_should_relay_response() is called with REPLY_LOCK when the timer
process fires on the fr_inv_timer (no response from the INVITE that was
relayed, other than 100 provisional) and a 408 is generated. However, from
within that function there are calls to run_failure_handlers() which in
turn *could* try and lock the reply (viz. somebody having a t_reply() call
in the cfg file - in failure route block). This would result in another
lock on the same transaction's REPLY_LOCK....
Has anybody else experienced something like this?
this is on master btw.
Cheers
Jason
_______________________________________________
sr-dev mailing
listsr-dev@lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
--
Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
11 p.m.
Hello,
what are the parameters for tm you are using?
Cheers,
Daniel
On 09/04/14 22:32, Jason Penton wrote:
Hey Daniel,
Yes I did a test with a very basic config file and I am not able to
re-create. However, with my *complex* cfg file I can re-create every
time. Tomorrow I will compare what is different and report back...
hopefully with fix ;)
here is bt of timer process deadlocking itself:
#0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
#1 0x00007f5009f22004 in futex_get (lock=0x7f4fc55030d8) at
../../mem/../futexlock.h:123
#2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8, file=0x7f5009f90fd1
"t_cancel.c", function=0x7f5009f91980 "cancel_branch", line=250) at
lock.h:99
#3 0x00007f5009f23271 in cancel_branch (t=0x7f4fc5501b40, branch=0,
reason=0x7fff646d03a8, flags=3) at t_cancel.c:250
#4 0x00007f5009f22c02 in cancel_uacs (t=0x7f4fc5501b40,
cancel_data=0x7fff646d03a0, flags=1) at t_cancel.c:123
#5 0x00007f5009f718c4 in _reply_light (trans=0x7f4fc5501b40,
buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR select next
S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
SIP/2.0/UDP 10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"...,
len=778, code=500, to_tag=0x7f500a1c7ae0
"c82b15d7f12ef185f95fe4945457d449-8bab", to_tag_len=37, lock=0,
bm=0x7fff646d0b60) at t_reply.c:660
#6 0x00007f5009f7244c in _reply (trans=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on
LIR select next S-CSCF", lock=0) at t_reply.c:795
#7 0x00007f5009f76436 in t_reply_unsafe (t=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on
LIR select next S-CSCF") at t_reply.c:1643
#8 0x00007f5009f57621 in w_t_reply (msg=0x7f500a1c6bc0,
p1=0x7f500a2497d8 "\340\332$\nP\177", p2=0x7f500a249870
"h\321$\nP\177") at tm.c:1324
#9 0x000000000041a700 in do_action (h=0x7fff646d1d30,
a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1119
#10 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1607
#11 0x000000000041a5a4 in do_action (h=0x7fff646d1d30,
a=0x7f500a24d478, msg=0x7f500a1c6bc0) at action.c:1102
#12 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a249148, msg=0x7f500a1c6bc0) at action.c:1607
#13 0x000000000041a54e in do_action (h=0x7fff646d1d30,
a=0x7f500a24c500, msg=0x7f500a1c6bc0) at action.c:1098
#14 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a247a28, msg=0x7f500a1c6bc0) at action.c:1607
#15 0x0000000000423fdf in run_top_route (a=0x7f500a247a28,
msg=0x7f500a1c6bc0, c=0x0) at action.c:1693
#16 0x00007f5009f73815 in run_failure_handlers (t=0x7f4fc5501b40,
rpl=0xffffffffffffffff, code=408, extra_flags=96) at t_reply.c:1061
#17 0x00007f5009f7527a in t_should_relay_response
(Trans=0x7f4fc5501b40, new_code=408, branch=1,
should_store=0x7fff646d201c, should_relay=0x7fff646d2018,
cancel_data=0x7fff646d2070,
reply=0xffffffffffffffff) at t_reply.c:1416
#18 0x00007f5009f76ede in relay_reply (t=0x7f4fc5501b40,
p_msg=0xffffffffffffffff, branch=1, msg_status=408,
cancel_data=0x7fff646d2070, do_put_on_wait=0) at t_reply.c:1819
#19 0x00007f5009f44c88 in fake_reply (t=0x7f4fc5501b40, branch=1,
code=408) at timer.c:354
#20 0x00007f5009f450e7 in final_response_handler
(r_buf=0x7f4fc5501e60, t=0x7f4fc5501b40) at timer.c:526
#21 0x00007f5009f4518d in retr_buf_handler (ticks=260027386,
tl=0x7f4fc5501e80, p=0x3e8) at timer.c:584
#22 0x0000000000544119 in timer_list_expire (t=260027386,
h=0x7f4fc527cbe0, slow_l=0x7f4fc527cdf0, slow_mark=0) at timer.c:894
#23 0x0000000000544418 in timer_handler () at timer.c:959
#24 0x00000000005446b2 in timer_main () at timer.c:998
#25 0x0000000000471ddf in main_loop () at main.c:1689
On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin Mierla
<miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote:
Hello,
that should not be a very rare case and I would expect to be
caught so far, anyhow ... this looks like easy to reproduce, have
you tried it?
You can have two kamailio, one relying the invite to the second,
which will reply with 100, then wait for the timeout on the first
instance. You can add some debug messages in the code to see if
the lock is called twice.
Cheers,
Daniel
On 09/04/14 17:51, Jason Penton wrote:
--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Hi All,
I have been experiencing a deadlock when a timeout occurs on a
t_relayed() INVITE. Going through the code I have noticed a
possible chance of deadlock (without re-entrant enabled). Here is
my thinking:
t_should_relay_response() is called with REPLY_LOCK when the
timer process fires on the fr_inv_timer (no response from the
INVITE that was relayed, other than 100 provisional) and a 408 is
generated. However, from within that function there are calls
to run_failure_handlers() which in turn *could* try and lock the
reply (viz. somebody having a t_reply() call in the cfg file - in
failure route block). This would result in another lock on the
same transaction's REPLY_LOCK....
Has anybody else experienced something like this?
this is on master btw.
Cheers
Jason
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org <mailto:sr-dev@lists.sip-router.org>
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
--
Daniel-Constantin Mierla -http://www.asipto.com
http://twitter.com/#!/miconda <http://twitter.com/#%21/miconda>
-http://www.linkedin.com/in/miconda
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org <mailto:sr-dev@lists.sip-router.org>
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
11:26 p.m.
Hey Daniel,
nothing extraordinary...
# -- TM params --
modparam("tm", "fr_timer", 20000);
modparam("tm", "fr_inv_timer", 10000)
Cheers
Jason
On Wed, Apr 9, 2014 at 10:32 PM, Jason Penton <jason.penton(a)gmail.com>wrote;wrote:
Hey Daniel,
Yes I did a test with a very basic config file and I am not able to
re-create. However, with my *complex* cfg file I can re-create every time.
Tomorrow I will compare what is different and report back... hopefully with
fix ;)
here is bt of timer process deadlocking itself:
#0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
#1 0x00007f5009f22004 in futex_get (lock=0x7f4fc55030d8) at
../../mem/../futexlock.h:123
#2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8, file=0x7f5009f90fd1
"t_cancel.c", function=0x7f5009f91980 "cancel_branch", line=250) at
lock.h:99
#3 0x00007f5009f23271 in cancel_branch (t=0x7f4fc5501b40, branch=0,
reason=0x7fff646d03a8, flags=3) at t_cancel.c:250
#4 0x00007f5009f22c02 in cancel_uacs (t=0x7f4fc5501b40,
cancel_data=0x7fff646d03a0, flags=1) at t_cancel.c:123
#5 0x00007f5009f718c4 in _reply_light (trans=0x7f4fc5501b40,
buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR select next
S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
SIP/2.0/UDP 10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"..., len=778,
code=500, to_tag=0x7f500a1c7ae0 "c82b15d7f12ef185f95fe4945457d449-8bab",
to_tag_len=37, lock=0, bm=0x7fff646d0b60) at t_reply.c:660
#6 0x00007f5009f7244c in _reply (trans=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
select next S-CSCF", lock=0) at t_reply.c:795
#7 0x00007f5009f76436 in t_reply_unsafe (t=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
select next S-CSCF") at t_reply.c:1643
#8 0x00007f5009f57621 in w_t_reply (msg=0x7f500a1c6bc0, p1=0x7f500a2497d8
"\340\332$\nP\177", p2=0x7f500a249870 "h\321$\nP\177") at tm.c:1324
#9 0x000000000041a700 in do_action (h=0x7fff646d1d30, a=0x7f500a24cee8,
msg=0x7f500a1c6bc0) at action.c:1119
#10 0x0000000000423831 in run_actions (h=0x7fff646d1d30, a=0x7f500a24cee8,
msg=0x7f500a1c6bc0) at action.c:1607
#11 0x000000000041a5a4 in do_action (h=0x7fff646d1d30, a=0x7f500a24d478,
msg=0x7f500a1c6bc0) at action.c:1102
#12 0x0000000000423831 in run_actions (h=0x7fff646d1d30, a=0x7f500a249148,
msg=0x7f500a1c6bc0) at action.c:1607
#13 0x000000000041a54e in do_action (h=0x7fff646d1d30, a=0x7f500a24c500,
msg=0x7f500a1c6bc0) at action.c:1098
#14 0x0000000000423831 in run_actions (h=0x7fff646d1d30, a=0x7f500a247a28,
msg=0x7f500a1c6bc0) at action.c:1607
#15 0x0000000000423fdf in run_top_route (a=0x7f500a247a28,
msg=0x7f500a1c6bc0, c=0x0) at action.c:1693
#16 0x00007f5009f73815 in run_failure_handlers (t=0x7f4fc5501b40,
rpl=0xffffffffffffffff, code=408, extra_flags=96) at t_reply.c:1061
#17 0x00007f5009f7527a in t_should_relay_response (Trans=0x7f4fc5501b40,
new_code=408, branch=1, should_store=0x7fff646d201c,
should_relay=0x7fff646d2018, cancel_data=0x7fff646d2070,
reply=0xffffffffffffffff) at t_reply.c:1416
#18 0x00007f5009f76ede in relay_reply (t=0x7f4fc5501b40,
p_msg=0xffffffffffffffff, branch=1, msg_status=408,
cancel_data=0x7fff646d2070, do_put_on_wait=0) at t_reply.c:1819
#19 0x00007f5009f44c88 in fake_reply (t=0x7f4fc5501b40, branch=1,
code=408) at timer.c:354
#20 0x00007f5009f450e7 in final_response_handler (r_buf=0x7f4fc5501e60,
t=0x7f4fc5501b40) at timer.c:526
#21 0x00007f5009f4518d in retr_buf_handler (ticks=260027386,
tl=0x7f4fc5501e80, p=0x3e8) at timer.c:584
#22 0x0000000000544119 in timer_list_expire (t=260027386,
h=0x7f4fc527cbe0, slow_l=0x7f4fc527cdf0, slow_mark=0) at timer.c:894
#23 0x0000000000544418 in timer_handler () at timer.c:959
#24 0x00000000005446b2 in timer_main () at timer.c:998
#25 0x0000000000471ddf in main_loop () at main.c:1689
On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin Mierla <
miconda(a)gmail.com> wrote:
Hello,
that should not be a very rare case and I would expect to be caught so
far, anyhow ... this looks like easy to reproduce, have you tried it?
You can have two kamailio, one relying the invite to the second, which
will reply with 100, then wait for the timeout on the first instance. You
can add some debug messages in the code to see if the lock is called twice.
Cheers,
Daniel
On 09/04/14 17:51, Jason Penton wrote:
Hi All,
I have been experiencing a deadlock when a timeout occurs on a
t_relayed() INVITE. Going through the code I have noticed a possible chance
of deadlock (without re-entrant enabled). Here is my thinking:
t_should_relay_response() is called with REPLY_LOCK when the timer
process fires on the fr_inv_timer (no response from the INVITE that was
relayed, other than 100 provisional) and a 408 is generated. However, from
within that function there are calls to run_failure_handlers() which in
turn *could* try and lock the reply (viz. somebody having a t_reply() call
in the cfg file - in failure route block). This would result in another
lock on the same transaction's REPLY_LOCK....
Has anybody else experienced something like this?
this is on master btw.
Cheers
Jason
_______________________________________________
sr-dev mailing
listsr-dev@lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
--
Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
10 Apr
10 Apr
9:01 a.m.
Hello Jason,
I pushed a patch trying to fix this case, it is only on git master
branch. Can you test it? If all goes fine, we can consider backporting it.
Cheers,
Daniel
On 09/04/14 23:26, Jason Penton wrote:
Hey Daniel,
nothing extraordinary...
# -- TM params --
modparam("tm", "fr_timer", 20000);
modparam("tm", "fr_inv_timer", 10000)
Cheers
Jason
On Wed, Apr 9, 2014 at 10:32 PM, Jason Penton <jason.penton(a)gmail.com
<mailto:jason.penton@gmail.com>> wrote:
Hey Daniel,
Yes I did a test with a very basic config file and I am not able
to re-create. However, with my *complex* cfg file I can re-create
every time. Tomorrow I will compare what is different and report
back... hopefully with fix ;)
here is bt of timer process deadlocking itself:
#0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
#1 0x00007f5009f22004 in futex_get (lock=0x7f4fc55030d8) at
../../mem/../futexlock.h:123
#2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8,
file=0x7f5009f90fd1 "t_cancel.c", function=0x7f5009f91980
"cancel_branch", line=250) at lock.h:99
#3 0x00007f5009f23271 in cancel_branch (t=0x7f4fc5501b40,
branch=0, reason=0x7fff646d03a8, flags=3) at t_cancel.c:250
#4 0x00007f5009f22c02 in cancel_uacs (t=0x7f4fc5501b40,
cancel_data=0x7fff646d03a0, flags=1) at t_cancel.c:123
#5 0x00007f5009f718c4 in _reply_light (trans=0x7f4fc5501b40,
buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR select
next S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
SIP/2.0/UDP 10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"...,
len=778, code=500, to_tag=0x7f500a1c7ae0
"c82b15d7f12ef185f95fe4945457d449-8bab", to_tag_len=37, lock=0,
bm=0x7fff646d0b60) at t_reply.c:660
#6 0x00007f5009f7244c in _reply (trans=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error
on LIR select next S-CSCF", lock=0) at t_reply.c:795
#7 0x00007f5009f76436 in t_reply_unsafe (t=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error
on LIR select next S-CSCF") at t_reply.c:1643
#8 0x00007f5009f57621 in w_t_reply (msg=0x7f500a1c6bc0,
p1=0x7f500a2497d8 "\340\332$\nP\177", p2=0x7f500a249870
"h\321$\nP\177") at tm.c:1324
#9 0x000000000041a700 in do_action (h=0x7fff646d1d30,
a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1119
#10 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1607
#11 0x000000000041a5a4 in do_action (h=0x7fff646d1d30,
a=0x7f500a24d478, msg=0x7f500a1c6bc0) at action.c:1102
#12 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a249148, msg=0x7f500a1c6bc0) at action.c:1607
#13 0x000000000041a54e in do_action (h=0x7fff646d1d30,
a=0x7f500a24c500, msg=0x7f500a1c6bc0) at action.c:1098
#14 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a247a28, msg=0x7f500a1c6bc0) at action.c:1607
#15 0x0000000000423fdf in run_top_route (a=0x7f500a247a28,
msg=0x7f500a1c6bc0, c=0x0) at action.c:1693
#16 0x00007f5009f73815 in run_failure_handlers (t=0x7f4fc5501b40,
rpl=0xffffffffffffffff, code=408, extra_flags=96) at t_reply.c:1061
#17 0x00007f5009f7527a in t_should_relay_response
(Trans=0x7f4fc5501b40, new_code=408, branch=1,
should_store=0x7fff646d201c, should_relay=0x7fff646d2018,
cancel_data=0x7fff646d2070,
reply=0xffffffffffffffff) at t_reply.c:1416
#18 0x00007f5009f76ede in relay_reply (t=0x7f4fc5501b40,
p_msg=0xffffffffffffffff, branch=1, msg_status=408,
cancel_data=0x7fff646d2070, do_put_on_wait=0) at t_reply.c:1819
#19 0x00007f5009f44c88 in fake_reply (t=0x7f4fc5501b40, branch=1,
code=408) at timer.c:354
#20 0x00007f5009f450e7 in final_response_handler
(r_buf=0x7f4fc5501e60, t=0x7f4fc5501b40) at timer.c:526
#21 0x00007f5009f4518d in retr_buf_handler (ticks=260027386,
tl=0x7f4fc5501e80, p=0x3e8) at timer.c:584
#22 0x0000000000544119 in timer_list_expire (t=260027386,
h=0x7f4fc527cbe0, slow_l=0x7f4fc527cdf0, slow_mark=0) at timer.c:894
#23 0x0000000000544418 in timer_handler () at timer.c:959
#24 0x00000000005446b2 in timer_main () at timer.c:998
#25 0x0000000000471ddf in main_loop () at main.c:1689
On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin Mierla
<miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote:
Hello,
that should not be a very rare case and I would expect to be
caught so far, anyhow ... this looks like easy to reproduce,
have you tried it?
You can have two kamailio, one relying the invite to the
second, which will reply with 100, then wait for the timeout
on the first instance. You can add some debug messages in the
code to see if the lock is called twice.
Cheers,
Daniel
On 09/04/14 17:51, Jason Penton wrote:
--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Hi All,
I have been experiencing a deadlock when a timeout occurs on
a t_relayed() INVITE. Going through the code I have noticed a
possible chance of deadlock (without re-entrant enabled).
Here is my thinking:
t_should_relay_response() is called with REPLY_LOCK when the
timer process fires on the fr_inv_timer (no response from the
INVITE that was relayed, other than 100 provisional) and a
408 is generated. However, from within that function there
are calls to run_failure_handlers() which in turn *could* try
and lock the reply (viz. somebody having a t_reply() call in
the cfg file - in failure route block). This would result in
another lock on the same transaction's REPLY_LOCK....
Has anybody else experienced something like this?
this is on master btw.
Cheers
Jason
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org <mailto:sr-dev@lists.sip-router.org>
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
--
Daniel-Constantin Mierla -http://www.asipto.com
http://twitter.com/#!/miconda <http://twitter.com/#%21/miconda>
-http://www.linkedin.com/in/miconda
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org <mailto:sr-dev@lists.sip-router.org>
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
9:06 a.m.
oh excellent, I will look at it right away - was just getting ready to jump
in myself ;)
Cheers
Jason
On Thu, Apr 10, 2014 at 9:01 AM, Daniel-Constantin Mierla <miconda(a)gmail.com
wrote:
> Hello Jason,
>
> I pushed a patch trying to fix this case, it is only on git master branch.
> Can you test it? If all goes fine, we can consider backporting it.
>
> Cheers,
> Daniel
>
>
> On 09/04/14 23:26, Jason Penton wrote:
>
> Hey Daniel,
>
> nothing extraordinary...
>
> # -- TM params --
> modparam("tm", "fr_timer", 20000);
> modparam("tm", "fr_inv_timer", 10000)
>
>
> Cheers
> Jason
>
>
> On Wed, Apr 9, 2014 at 10:32 PM, Jason Penton <jason.penton(a)gmail.com>wrote;wrote:
>
>> Hey Daniel,
>>
>> Yes I did a test with a very basic config file and I am not able to
>> re-create. However, with my *complex* cfg file I can re-create every time.
>> Tomorrow I will compare what is different and report back... hopefully with
>> fix ;)
>>
>> here is bt of timer process deadlocking itself:
>>
>> #0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
>> #1 0x00007f5009f22004 in futex_get (lock=0x7f4fc55030d8) at
>> ../../mem/../futexlock.h:123
>> #2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8, file=0x7f5009f90fd1
>> "t_cancel.c", function=0x7f5009f91980 "cancel_branch",
line=250) at
>> lock.h:99
>> #3 0x00007f5009f23271 in cancel_branch (t=0x7f4fc5501b40, branch=0,
>> reason=0x7fff646d03a8, flags=3) at t_cancel.c:250
>> #4 0x00007f5009f22c02 in cancel_uacs (t=0x7f4fc5501b40,
>> cancel_data=0x7fff646d03a0, flags=1) at t_cancel.c:123
>> #5 0x00007f5009f718c4 in _reply_light (trans=0x7f4fc5501b40,
>> buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR select next
>> S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
>> SIP/2.0/UDP 10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"..., len=778,
>> code=500, to_tag=0x7f500a1c7ae0
"c82b15d7f12ef185f95fe4945457d449-8bab",
>> to_tag_len=37, lock=0, bm=0x7fff646d0b60) at t_reply.c:660
>> #6 0x00007f5009f7244c in _reply (trans=0x7f4fc5501b40,
>> p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
>> select next S-CSCF", lock=0) at t_reply.c:795
>> #7 0x00007f5009f76436 in t_reply_unsafe (t=0x7f4fc5501b40,
>> p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
>> select next S-CSCF") at t_reply.c:1643
>> #8 0x00007f5009f57621 in w_t_reply (msg=0x7f500a1c6bc0,
>> p1=0x7f500a2497d8 "\340\332$\nP\177", p2=0x7f500a249870
"h\321$\nP\177") at
>> tm.c:1324
>> #9 0x000000000041a700 in do_action (h=0x7fff646d1d30, a=0x7f500a24cee8,
>> msg=0x7f500a1c6bc0) at action.c:1119
>> #10 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
>> a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1607
>> #11 0x000000000041a5a4 in do_action (h=0x7fff646d1d30, a=0x7f500a24d478,
>> msg=0x7f500a1c6bc0) at action.c:1102
>> #12 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
>> a=0x7f500a249148, msg=0x7f500a1c6bc0) at action.c:1607
>> #13 0x000000000041a54e in do_action (h=0x7fff646d1d30, a=0x7f500a24c500,
>> msg=0x7f500a1c6bc0) at action.c:1098
>> #14 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
>> a=0x7f500a247a28, msg=0x7f500a1c6bc0) at action.c:1607
>> #15 0x0000000000423fdf in run_top_route (a=0x7f500a247a28,
>> msg=0x7f500a1c6bc0, c=0x0) at action.c:1693
>> #16 0x00007f5009f73815 in run_failure_handlers (t=0x7f4fc5501b40,
>> rpl=0xffffffffffffffff, code=408, extra_flags=96) at t_reply.c:1061
>> #17 0x00007f5009f7527a in t_should_relay_response (Trans=0x7f4fc5501b40,
>> new_code=408, branch=1, should_store=0x7fff646d201c,
>> should_relay=0x7fff646d2018, cancel_data=0x7fff646d2070,
>> reply=0xffffffffffffffff) at t_reply.c:1416
>> #18 0x00007f5009f76ede in relay_reply (t=0x7f4fc5501b40,
>> p_msg=0xffffffffffffffff, branch=1, msg_status=408,
>> cancel_data=0x7fff646d2070, do_put_on_wait=0) at t_reply.c:1819
>> #19 0x00007f5009f44c88 in fake_reply (t=0x7f4fc5501b40, branch=1,
>> code=408) at timer.c:354
>> #20 0x00007f5009f450e7 in final_response_handler (r_buf=0x7f4fc5501e60,
>> t=0x7f4fc5501b40) at timer.c:526
>> #21 0x00007f5009f4518d in retr_buf_handler (ticks=260027386,
>> tl=0x7f4fc5501e80, p=0x3e8) at timer.c:584
>> #22 0x0000000000544119 in timer_list_expire (t=260027386,
>> h=0x7f4fc527cbe0, slow_l=0x7f4fc527cdf0, slow_mark=0) at timer.c:894
>> #23 0x0000000000544418 in timer_handler () at timer.c:959
>> #24 0x00000000005446b2 in timer_main () at timer.c:998
>> #25 0x0000000000471ddf in main_loop () at main.c:1689
>>
>>
>>
>> On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin Mierla <
>> miconda(a)gmail.com wrote:
>>
>>> Hello,
>>>
>>> that should not be a very rare case and I would expect to be caught so
>>> far, anyhow ... this looks like easy to reproduce, have you tried it?
>>>
>>> You can have two kamailio, one relying the invite to the second, which
>>> will reply with 100, then wait for the timeout on the first instance. You
>>> can add some debug messages in the code to see if the lock is called twice.
>>>
>>> Cheers,
>>> Daniel
>>>
>>>
>>> On 09/04/14 17:51, Jason Penton wrote:
>>>
>>> Hi All,
>>>
>>> I have been experiencing a deadlock when a timeout occurs on a
>>> t_relayed() INVITE. Going through the code I have noticed a possible chance
>>> of deadlock (without re-entrant enabled). Here is my thinking:
>>>
>>> t_should_relay_response() is called with REPLY_LOCK when the timer
>>> process fires on the fr_inv_timer (no response from the INVITE that was
>>> relayed, other than 100 provisional) and a 408 is generated. However, from
>>> within that function there are calls to run_failure_handlers() which in
>>> turn *could* try and lock the reply (viz. somebody having a t_reply() call
>>> in the cfg file - in failure route block). This would result in another
>>> lock on the same transaction's REPLY_LOCK....
>>>
>>> Has anybody else experienced something like this?
>>>
>>> this is on master btw.
>>>
>>> Cheers
>>> Jason
>>>
>>>
>>> _______________________________________________
>>> sr-dev mailing
listsr-dev@lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>>>
>>>
>>> --
>>> Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda
- http://www.linkedin.com/in/miconda
>>>
>>>
>>> _______________________________________________
>>> sr-dev mailing list
>>> sr-dev(a)lists.sip-router.org
>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>>>
>>>
>>
>
> --
> Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
>
>
10:51 a.m.
Nice work Daniel!! - Works perfectly! ;)
Cheers
Jason
On Thu, Apr 10, 2014 at 9:06 AM, Jason Penton <jason.penton(a)gmail.com>wrote;wrote:
oh excellent, I will look at it right away - was just
getting ready to
jump in myself ;)
Cheers
Jason
On Thu, Apr 10, 2014 at 9:01 AM, Daniel-Constantin Mierla <
miconda(a)gmail.com> wrote:
Hello Jason,
I pushed a patch trying to fix this case, it is only on git master
branch. Can you test it? If all goes fine, we can consider backporting it.
Cheers,
Daniel
On 09/04/14 23:26, Jason Penton wrote:
Hey Daniel,
nothing extraordinary...
# -- TM params --
modparam("tm", "fr_timer", 20000);
modparam("tm", "fr_inv_timer", 10000)
Cheers
Jason
On Wed, Apr 9, 2014 at 10:32 PM, Jason Penton <jason.penton(a)gmail.com>wrote;wrote:
Hey Daniel,
Yes I did a test with a very basic config file and I am not able to
re-create. However, with my *complex* cfg file I can re-create every time.
Tomorrow I will compare what is different and report back... hopefully with
fix ;)
here is bt of timer process deadlocking itself:
#0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
#1 0x00007f5009f22004 in futex_get (lock=0x7f4fc55030d8) at
../../mem/../futexlock.h:123
#2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8, file=0x7f5009f90fd1
"t_cancel.c", function=0x7f5009f91980 "cancel_branch", line=250) at
lock.h:99
#3 0x00007f5009f23271 in cancel_branch (t=0x7f4fc5501b40, branch=0,
reason=0x7fff646d03a8, flags=3) at t_cancel.c:250
#4 0x00007f5009f22c02 in cancel_uacs (t=0x7f4fc5501b40,
cancel_data=0x7fff646d03a0, flags=1) at t_cancel.c:123
#5 0x00007f5009f718c4 in _reply_light (trans=0x7f4fc5501b40,
buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR select next
S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
SIP/2.0/UDP 10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"..., len=778,
code=500, to_tag=0x7f500a1c7ae0 "c82b15d7f12ef185f95fe4945457d449-8bab",
to_tag_len=37, lock=0, bm=0x7fff646d0b60) at t_reply.c:660
#6 0x00007f5009f7244c in _reply (trans=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
select next S-CSCF", lock=0) at t_reply.c:795
#7 0x00007f5009f76436 in t_reply_unsafe (t=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
select next S-CSCF") at t_reply.c:1643
#8 0x00007f5009f57621 in w_t_reply (msg=0x7f500a1c6bc0,
p1=0x7f500a2497d8 "\340\332$\nP\177", p2=0x7f500a249870
"h\321$\nP\177") at
tm.c:1324
#9 0x000000000041a700 in do_action (h=0x7fff646d1d30, a=0x7f500a24cee8,
msg=0x7f500a1c6bc0) at action.c:1119
#10 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1607
#11 0x000000000041a5a4 in do_action (h=0x7fff646d1d30, a=0x7f500a24d478,
msg=0x7f500a1c6bc0) at action.c:1102
#12 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a249148, msg=0x7f500a1c6bc0) at action.c:1607
#13 0x000000000041a54e in do_action (h=0x7fff646d1d30, a=0x7f500a24c500,
msg=0x7f500a1c6bc0) at action.c:1098
#14 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a247a28, msg=0x7f500a1c6bc0) at action.c:1607
#15 0x0000000000423fdf in run_top_route (a=0x7f500a247a28,
msg=0x7f500a1c6bc0, c=0x0) at action.c:1693
#16 0x00007f5009f73815 in run_failure_handlers (t=0x7f4fc5501b40,
rpl=0xffffffffffffffff, code=408, extra_flags=96) at t_reply.c:1061
#17 0x00007f5009f7527a in t_should_relay_response (Trans=0x7f4fc5501b40,
new_code=408, branch=1, should_store=0x7fff646d201c,
should_relay=0x7fff646d2018, cancel_data=0x7fff646d2070,
reply=0xffffffffffffffff) at t_reply.c:1416
#18 0x00007f5009f76ede in relay_reply (t=0x7f4fc5501b40,
p_msg=0xffffffffffffffff, branch=1, msg_status=408,
cancel_data=0x7fff646d2070, do_put_on_wait=0) at t_reply.c:1819
#19 0x00007f5009f44c88 in fake_reply (t=0x7f4fc5501b40, branch=1,
code=408) at timer.c:354
#20 0x00007f5009f450e7 in final_response_handler (r_buf=0x7f4fc5501e60,
t=0x7f4fc5501b40) at timer.c:526
#21 0x00007f5009f4518d in retr_buf_handler (ticks=260027386,
tl=0x7f4fc5501e80, p=0x3e8) at timer.c:584
#22 0x0000000000544119 in timer_list_expire (t=260027386,
h=0x7f4fc527cbe0, slow_l=0x7f4fc527cdf0, slow_mark=0) at timer.c:894
#23 0x0000000000544418 in timer_handler () at timer.c:959
#24 0x00000000005446b2 in timer_main () at timer.c:998
#25 0x0000000000471ddf in main_loop () at main.c:1689
On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin Mierla <
miconda(a)gmail.com> wrote:
--
Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
Hello,
that should not be a very rare case and I would expect to be caught so
far, anyhow ... this looks like easy to reproduce, have you tried it?
You can have two kamailio, one relying the invite to the second, which
will reply with 100, then wait for the timeout on the first instance. You
can add some debug messages in the code to see if the lock is called twice.
Cheers,
Daniel
On 09/04/14 17:51, Jason Penton wrote:
Hi All,
I have been experiencing a deadlock when a timeout occurs on a
t_relayed() INVITE. Going through the code I have noticed a possible chance
of deadlock (without re-entrant enabled). Here is my thinking:
t_should_relay_response() is called with REPLY_LOCK when the timer
process fires on the fr_inv_timer (no response from the INVITE that was
relayed, other than 100 provisional) and a 408 is generated. However, from
within that function there are calls to run_failure_handlers() which in
turn *could* try and lock the reply (viz. somebody having a t_reply() call
in the cfg file - in failure route block). This would result in another
lock on the same transaction's REPLY_LOCK....
Has anybody else experienced something like this?
this is on master btw.
Cheers
Jason
_______________________________________________
sr-dev mailing
listsr-dev@lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
--
Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
12:53 p.m.
OK. I will leave it a bit in master to see if there are any new reports,
then I will backport. I will also have to review the tm reply functions
that can be used from config to align them to the new check.
Cheers,
Daniel
On 10/04/14 09:06, Jason Penton wrote:
oh excellent, I will look at it right away - was just
getting ready to
jump in myself ;)
Cheers
Jason
On Thu, Apr 10, 2014 at 9:01 AM, Daniel-Constantin Mierla
<miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote:
Hello Jason,
I pushed a patch trying to fix this case, it is only on git master
branch. Can you test it? If all goes fine, we can consider
backporting it.
Cheers,
Daniel
On 09/04/14 23:26, Jason Penton wrote:
--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Hey Daniel,
nothing extraordinary...
# -- TM params --
modparam("tm", "fr_timer", 20000);
modparam("tm", "fr_inv_timer", 10000)
Cheers
Jason
On Wed, Apr 9, 2014 at 10:32 PM, Jason Penton
<jason.penton(a)gmail.com <mailto:jason.penton@gmail.com>> wrote:
Hey Daniel,
Yes I did a test with a very basic config file and I am not
able to re-create. However, with my *complex* cfg file I can
re-create every time. Tomorrow I will compare what is
different and report back... hopefully with fix ;)
here is bt of timer process deadlocking itself:
#0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
#1 0x00007f5009f22004 in futex_get (lock=0x7f4fc55030d8) at
../../mem/../futexlock.h:123
#2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8,
file=0x7f5009f90fd1 "t_cancel.c", function=0x7f5009f91980
"cancel_branch", line=250) at lock.h:99
#3 0x00007f5009f23271 in cancel_branch (t=0x7f4fc5501b40,
branch=0, reason=0x7fff646d03a8, flags=3) at t_cancel.c:250
#4 0x00007f5009f22c02 in cancel_uacs (t=0x7f4fc5501b40,
cancel_data=0x7fff646d03a0, flags=1) at t_cancel.c:123
#5 0x00007f5009f718c4 in _reply_light (trans=0x7f4fc5501b40,
buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR
select next S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
SIP/2.0/UDP
10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"..., len=778,
code=500, to_tag=0x7f500a1c7ae0
"c82b15d7f12ef185f95fe4945457d449-8bab", to_tag_len=37,
lock=0, bm=0x7fff646d0b60) at t_reply.c:660
#6 0x00007f5009f7244c in _reply (trans=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server
error on LIR select next S-CSCF", lock=0) at t_reply.c:795
#7 0x00007f5009f76436 in t_reply_unsafe (t=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server
error on LIR select next S-CSCF") at t_reply.c:1643
#8 0x00007f5009f57621 in w_t_reply (msg=0x7f500a1c6bc0,
p1=0x7f500a2497d8 "\340\332$\nP\177", p2=0x7f500a249870
"h\321$\nP\177") at tm.c:1324
#9 0x000000000041a700 in do_action (h=0x7fff646d1d30,
a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1119
#10 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1607
#11 0x000000000041a5a4 in do_action (h=0x7fff646d1d30,
a=0x7f500a24d478, msg=0x7f500a1c6bc0) at action.c:1102
#12 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a249148, msg=0x7f500a1c6bc0) at action.c:1607
#13 0x000000000041a54e in do_action (h=0x7fff646d1d30,
a=0x7f500a24c500, msg=0x7f500a1c6bc0) at action.c:1098
#14 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a247a28, msg=0x7f500a1c6bc0) at action.c:1607
#15 0x0000000000423fdf in run_top_route (a=0x7f500a247a28,
msg=0x7f500a1c6bc0, c=0x0) at action.c:1693
#16 0x00007f5009f73815 in run_failure_handlers
(t=0x7f4fc5501b40, rpl=0xffffffffffffffff, code=408,
extra_flags=96) at t_reply.c:1061
#17 0x00007f5009f7527a in t_should_relay_response
(Trans=0x7f4fc5501b40, new_code=408, branch=1,
should_store=0x7fff646d201c, should_relay=0x7fff646d2018,
cancel_data=0x7fff646d2070,
reply=0xffffffffffffffff) at t_reply.c:1416
#18 0x00007f5009f76ede in relay_reply (t=0x7f4fc5501b40,
p_msg=0xffffffffffffffff, branch=1, msg_status=408,
cancel_data=0x7fff646d2070, do_put_on_wait=0) at t_reply.c:1819
#19 0x00007f5009f44c88 in fake_reply (t=0x7f4fc5501b40,
branch=1, code=408) at timer.c:354
#20 0x00007f5009f450e7 in final_response_handler
(r_buf=0x7f4fc5501e60, t=0x7f4fc5501b40) at timer.c:526
#21 0x00007f5009f4518d in retr_buf_handler (ticks=260027386,
tl=0x7f4fc5501e80, p=0x3e8) at timer.c:584
#22 0x0000000000544119 in timer_list_expire (t=260027386,
h=0x7f4fc527cbe0, slow_l=0x7f4fc527cdf0, slow_mark=0) at
timer.c:894
#23 0x0000000000544418 in timer_handler () at timer.c:959
#24 0x00000000005446b2 in timer_main () at timer.c:998
#25 0x0000000000471ddf in main_loop () at main.c:1689
On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin Mierla
<miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote:
Hello,
that should not be a very rare case and I would expect to
be caught so far, anyhow ... this looks like easy to
reproduce, have you tried it?
You can have two kamailio, one relying the invite to the
second, which will reply with 100, then wait for the
timeout on the first instance. You can add some debug
messages in the code to see if the lock is called twice.
Cheers,
Daniel
On 09/04/14 17:51, Jason Penton wrote:
--
Daniel-Constantin Mierla -http://www.asipto.com
http://twitter.com/#!/miconda <http://twitter.com/#%21/miconda>
-http://www.linkedin.com/in/miconda
Hi All,
I have been experiencing a deadlock when a timeout
occurs on a t_relayed() INVITE. Going through the code I
have noticed a possible chance of deadlock (without
re-entrant enabled). Here is my thinking:
t_should_relay_response() is called with REPLY_LOCK when
the timer process fires on the fr_inv_timer (no response
from the INVITE that was relayed, other than 100
provisional) and a 408 is generated. However, from
within that function there are calls
to run_failure_handlers() which in turn *could* try and
lock the reply (viz. somebody having a t_reply() call in
the cfg file - in failure route block). This would
result in another lock on the same transaction's
REPLY_LOCK....
Has anybody else experienced something like this?
this is on master btw.
Cheers
Jason
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org <mailto:sr-dev@lists.sip-router.org>
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
--
Daniel-Constantin Mierla -http://www.asipto.com
http://twitter.com/#!/miconda <http://twitter.com/#%21/miconda>
-http://www.linkedin.com/in/miconda
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org
<mailto:sr-dev@lists.sip-router.org>
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
1:24 p.m.
Hey Daniel,
which reply functions are you referring to? API functions?
Cheers
Jason
On Thu, Apr 10, 2014 at 12:53 PM, Daniel-Constantin Mierla <
miconda(a)gmail.com> wrote:
OK. I will leave it a bit in master to see if there
are any new reports,
then I will backport. I will also have to review the tm reply functions
that can be used from config to align them to the new check.
Cheers,
Daniel
On 10/04/14 09:06, Jason Penton wrote:
oh excellent, I will look at it right away - was just getting ready to
jump in myself ;)
Cheers
Jason
On Thu, Apr 10, 2014 at 9:01 AM, Daniel-Constantin Mierla <
miconda(a)gmail.com> wrote:
Hello Jason,
I pushed a patch trying to fix this case, it is only on git master
branch. Can you test it? If all goes fine, we can consider backporting it.
Cheers,
Daniel
On 09/04/14 23:26, Jason Penton wrote:
Hey Daniel,
nothing extraordinary...
# -- TM params --
modparam("tm", "fr_timer", 20000);
modparam("tm", "fr_inv_timer", 10000)
Cheers
Jason
On Wed, Apr 9, 2014 at 10:32 PM, Jason Penton <jason.penton(a)gmail.com>wrote;wrote:
--
Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
Hey Daniel,
Yes I did a test with a very basic config file and I am not able to
re-create. However, with my *complex* cfg file I can re-create every time.
Tomorrow I will compare what is different and report back... hopefully with
fix ;)
here is bt of timer process deadlocking itself:
#0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
#1 0x00007f5009f22004 in futex_get (lock=0x7f4fc55030d8) at
../../mem/../futexlock.h:123
#2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8, file=0x7f5009f90fd1
"t_cancel.c", function=0x7f5009f91980 "cancel_branch", line=250) at
lock.h:99
#3 0x00007f5009f23271 in cancel_branch (t=0x7f4fc5501b40, branch=0,
reason=0x7fff646d03a8, flags=3) at t_cancel.c:250
#4 0x00007f5009f22c02 in cancel_uacs (t=0x7f4fc5501b40,
cancel_data=0x7fff646d03a0, flags=1) at t_cancel.c:123
#5 0x00007f5009f718c4 in _reply_light (trans=0x7f4fc5501b40,
buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR select next
S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
SIP/2.0/UDP 10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"..., len=778,
code=500, to_tag=0x7f500a1c7ae0 "c82b15d7f12ef185f95fe4945457d449-8bab",
to_tag_len=37, lock=0, bm=0x7fff646d0b60) at t_reply.c:660
#6 0x00007f5009f7244c in _reply (trans=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
select next S-CSCF", lock=0) at t_reply.c:795
#7 0x00007f5009f76436 in t_reply_unsafe (t=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
select next S-CSCF") at t_reply.c:1643
#8 0x00007f5009f57621 in w_t_reply (msg=0x7f500a1c6bc0,
p1=0x7f500a2497d8 "\340\332$\nP\177", p2=0x7f500a249870
"h\321$\nP\177") at
tm.c:1324
#9 0x000000000041a700 in do_action (h=0x7fff646d1d30, a=0x7f500a24cee8,
msg=0x7f500a1c6bc0) at action.c:1119
#10 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1607
#11 0x000000000041a5a4 in do_action (h=0x7fff646d1d30, a=0x7f500a24d478,
msg=0x7f500a1c6bc0) at action.c:1102
#12 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a249148, msg=0x7f500a1c6bc0) at action.c:1607
#13 0x000000000041a54e in do_action (h=0x7fff646d1d30, a=0x7f500a24c500,
msg=0x7f500a1c6bc0) at action.c:1098
#14 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a247a28, msg=0x7f500a1c6bc0) at action.c:1607
#15 0x0000000000423fdf in run_top_route (a=0x7f500a247a28,
msg=0x7f500a1c6bc0, c=0x0) at action.c:1693
#16 0x00007f5009f73815 in run_failure_handlers (t=0x7f4fc5501b40,
rpl=0xffffffffffffffff, code=408, extra_flags=96) at t_reply.c:1061
#17 0x00007f5009f7527a in t_should_relay_response (Trans=0x7f4fc5501b40,
new_code=408, branch=1, should_store=0x7fff646d201c,
should_relay=0x7fff646d2018, cancel_data=0x7fff646d2070,
reply=0xffffffffffffffff) at t_reply.c:1416
#18 0x00007f5009f76ede in relay_reply (t=0x7f4fc5501b40,
p_msg=0xffffffffffffffff, branch=1, msg_status=408,
cancel_data=0x7fff646d2070, do_put_on_wait=0) at t_reply.c:1819
#19 0x00007f5009f44c88 in fake_reply (t=0x7f4fc5501b40, branch=1,
code=408) at timer.c:354
#20 0x00007f5009f450e7 in final_response_handler (r_buf=0x7f4fc5501e60,
t=0x7f4fc5501b40) at timer.c:526
#21 0x00007f5009f4518d in retr_buf_handler (ticks=260027386,
tl=0x7f4fc5501e80, p=0x3e8) at timer.c:584
#22 0x0000000000544119 in timer_list_expire (t=260027386,
h=0x7f4fc527cbe0, slow_l=0x7f4fc527cdf0, slow_mark=0) at timer.c:894
#23 0x0000000000544418 in timer_handler () at timer.c:959
#24 0x00000000005446b2 in timer_main () at timer.c:998
#25 0x0000000000471ddf in main_loop () at main.c:1689
On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin Mierla <
miconda(a)gmail.com> wrote:
--
Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
Hello,
that should not be a very rare case and I would expect to be caught so
far, anyhow ... this looks like easy to reproduce, have you tried it?
You can have two kamailio, one relying the invite to the second, which
will reply with 100, then wait for the timeout on the first instance. You
can add some debug messages in the code to see if the lock is called twice.
Cheers,
Daniel
On 09/04/14 17:51, Jason Penton wrote:
Hi All,
I have been experiencing a deadlock when a timeout occurs on a
t_relayed() INVITE. Going through the code I have noticed a possible chance
of deadlock (without re-entrant enabled). Here is my thinking:
t_should_relay_response() is called with REPLY_LOCK when the timer
process fires on the fr_inv_timer (no response from the INVITE that was
relayed, other than 100 provisional) and a 408 is generated. However, from
within that function there are calls to run_failure_handlers() which in
turn *could* try and lock the reply (viz. somebody having a t_reply() call
in the cfg file - in failure route block). This would result in another
lock on the same transaction's REPLY_LOCK....
Has anybody else experienced something like this?
this is on master btw.
Cheers
Jason
_______________________________________________
sr-dev mailing
listsr-dev@lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
--
Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
4:35 p.m.
Hello,
iirc, there are several functions that script writer can use, like
t_reply_callid() from tmx. The idea is to analyze a bit in order to
detect if a forced reply may end up in canceling some pending branches
-- the reply on the branch doesnt matter anymore and should not be
considered anymore for relaying upstream, because the script writer
already decided what to send out.
Cheers,
Daniel
On 10/04/14 13:24, Jason Penton wrote:
Hey Daniel,
which reply functions are you referring to? API functions?
Cheers
Jason
On Thu, Apr 10, 2014 at 12:53 PM, Daniel-Constantin Mierla
<miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote:
OK. I will leave it a bit in master to see if there are any new
reports, then I will backport. I will also have to review the tm
reply functions that can be used from config to align them to the
new check.
Cheers,
Daniel
On 10/04/14 09:06, Jason Penton wrote:
--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
oh excellent, I will look at it right away -
was just getting
ready to jump in myself ;)
Cheers
Jason
On Thu, Apr 10, 2014 at 9:01 AM, Daniel-Constantin Mierla
<miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote:
Hello Jason,
I pushed a patch trying to fix this case, it is only on git
master branch. Can you test it? If all goes fine, we can
consider backporting it.
Cheers,
Daniel
On 09/04/14 23:26, Jason Penton wrote:
--
Daniel-Constantin Mierla -http://www.asipto.com
http://twitter.com/#!/miconda <http://twitter.com/#%21/miconda>
-http://www.linkedin.com/in/miconda
Hey Daniel,
nothing extraordinary...
# -- TM params --
modparam("tm", "fr_timer", 20000);
modparam("tm", "fr_inv_timer", 10000)
Cheers
Jason
On Wed, Apr 9, 2014 at 10:32 PM, Jason Penton
<jason.penton(a)gmail.com <mailto:jason.penton@gmail.com>> wrote:
Hey Daniel,
Yes I did a test with a very basic config file and I am
not able to re-create. However, with my *complex* cfg
file I can re-create every time. Tomorrow I will compare
what is different and report back... hopefully with fix ;)
here is bt of timer process deadlocking itself:
#0 syscall () at
../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
#1 0x00007f5009f22004 in futex_get
(lock=0x7f4fc55030d8) at ../../mem/../futexlock.h:123
#2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8,
file=0x7f5009f90fd1 "t_cancel.c",
function=0x7f5009f91980 "cancel_branch", line=250) at
lock.h:99
#3 0x00007f5009f23271 in cancel_branch
(t=0x7f4fc5501b40, branch=0, reason=0x7fff646d03a8,
flags=3) at t_cancel.c:250
#4 0x00007f5009f22c02 in cancel_uacs (t=0x7f4fc5501b40,
cancel_data=0x7fff646d03a0, flags=1) at t_cancel.c:123
#5 0x00007f5009f718c4 in _reply_light
(trans=0x7f4fc5501b40,
buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR
select next S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
SIP/2.0/UDP
10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"...,
len=778, code=500, to_tag=0x7f500a1c7ae0
"c82b15d7f12ef185f95fe4945457d449-8bab", to_tag_len=37,
lock=0, bm=0x7fff646d0b60) at t_reply.c:660
#6 0x00007f5009f7244c in _reply (trans=0x7f4fc5501b40,
p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48
"Server error on LIR select next S-CSCF", lock=0) at
t_reply.c:795
#7 0x00007f5009f76436 in t_reply_unsafe
(t=0x7f4fc5501b40, p_msg=0x7f500a1c6bc0, code=500,
text=0x7f500a249a48 "Server error on LIR select next
S-CSCF") at t_reply.c:1643
#8 0x00007f5009f57621 in w_t_reply (msg=0x7f500a1c6bc0,
p1=0x7f500a2497d8 "\340\332$\nP\177", p2=0x7f500a249870
"h\321$\nP\177") at tm.c:1324
#9 0x000000000041a700 in do_action (h=0x7fff646d1d30,
a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1119
#10 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1607
#11 0x000000000041a5a4 in do_action (h=0x7fff646d1d30,
a=0x7f500a24d478, msg=0x7f500a1c6bc0) at action.c:1102
#12 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a249148, msg=0x7f500a1c6bc0) at action.c:1607
#13 0x000000000041a54e in do_action (h=0x7fff646d1d30,
a=0x7f500a24c500, msg=0x7f500a1c6bc0) at action.c:1098
#14 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
a=0x7f500a247a28, msg=0x7f500a1c6bc0) at action.c:1607
#15 0x0000000000423fdf in run_top_route
(a=0x7f500a247a28, msg=0x7f500a1c6bc0, c=0x0) at
action.c:1693
#16 0x00007f5009f73815 in run_failure_handlers
(t=0x7f4fc5501b40, rpl=0xffffffffffffffff, code=408,
extra_flags=96) at t_reply.c:1061
#17 0x00007f5009f7527a in t_should_relay_response
(Trans=0x7f4fc5501b40, new_code=408, branch=1,
should_store=0x7fff646d201c,
should_relay=0x7fff646d2018, cancel_data=0x7fff646d2070,
reply=0xffffffffffffffff) at t_reply.c:1416
#18 0x00007f5009f76ede in relay_reply (t=0x7f4fc5501b40,
p_msg=0xffffffffffffffff, branch=1, msg_status=408,
cancel_data=0x7fff646d2070, do_put_on_wait=0) at
t_reply.c:1819
#19 0x00007f5009f44c88 in fake_reply (t=0x7f4fc5501b40,
branch=1, code=408) at timer.c:354
#20 0x00007f5009f450e7 in final_response_handler
(r_buf=0x7f4fc5501e60, t=0x7f4fc5501b40) at timer.c:526
#21 0x00007f5009f4518d in retr_buf_handler
(ticks=260027386, tl=0x7f4fc5501e80, p=0x3e8) at timer.c:584
#22 0x0000000000544119 in timer_list_expire
(t=260027386, h=0x7f4fc527cbe0, slow_l=0x7f4fc527cdf0,
slow_mark=0) at timer.c:894
#23 0x0000000000544418 in timer_handler () at timer.c:959
#24 0x00000000005446b2 in timer_main () at timer.c:998
#25 0x0000000000471ddf in main_loop () at main.c:1689
On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin Mierla
<miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote:
Hello,
that should not be a very rare case and I would
expect to be caught so far, anyhow ... this looks
like easy to reproduce, have you tried it?
You can have two kamailio, one relying the invite to
the second, which will reply with 100, then wait for
the timeout on the first instance. You can add some
debug messages in the code to see if the lock is
called twice.
Cheers,
Daniel
On 09/04/14 17:51, Jason Penton wrote:
--
Daniel-Constantin Mierla -http://www.asipto.com
http://twitter.com/#!/miconda <http://twitter.com/#%21/miconda>
-http://www.linkedin.com/in/miconda
Hi All,
I have been experiencing a deadlock when a timeout
occurs on a t_relayed() INVITE. Going through the
code I have noticed a possible chance of deadlock
(without re-entrant enabled). Here is my thinking:
t_should_relay_response() is called with REPLY_LOCK
when the timer process fires on the fr_inv_timer
(no response from the INVITE that was relayed,
other than 100 provisional) and a 408 is generated.
However, from within that function there are calls
to run_failure_handlers() which in turn *could* try
and lock the reply (viz. somebody having a
t_reply() call in the cfg file - in failure route
block). This would result in another lock on the
same transaction's REPLY_LOCK....
Has anybody else experienced something like this?
this is on master btw.
Cheers
Jason
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org <mailto:sr-dev@lists.sip-router.org>
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
--
Daniel-Constantin Mierla -http://www.asipto.com
http://twitter.com/#!/miconda <http://twitter.com/#%21/miconda>
-http://www.linkedin.com/in/miconda
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org
<mailto:sr-dev@lists.sip-router.org>
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
11 Apr
11 Apr
2:45 p.m.
yes okay - got it. I will test and analyse.
Thanks Daniel!
On Thu, Apr 10, 2014 at 4:35 PM, Daniel-Constantin Mierla <miconda(a)gmail.com
wrote:
> Hello,
>
> iirc, there are several functions that script writer can use, like
> t_reply_callid() from tmx. The idea is to analyze a bit in order to detect
> if a forced reply may end up in canceling some pending branches -- the
> reply on the branch doesnt matter anymore and should not be considered
> anymore for relaying upstream, because the script writer already decided
> what to send out.
>
> Cheers,
> Daniel
>
>
>
> On 10/04/14 13:24, Jason Penton wrote:
>
> Hey Daniel,
>
> which reply functions are you referring to? API functions?
>
> Cheers
> Jason
>
>
> On Thu, Apr 10, 2014 at 12:53 PM, Daniel-Constantin Mierla <
> miconda(a)gmail.com wrote:
>
>> OK. I will leave it a bit in master to see if there are any new reports,
>> then I will backport. I will also have to review the tm reply functions
>> that can be used from config to align them to the new check.
>>
>> Cheers,
>> Daniel
>>
>>
>> On 10/04/14 09:06, Jason Penton wrote:
>>
>> oh excellent, I will look at it right away - was just getting ready to
>> jump in myself ;)
>>
>> Cheers
>> Jason
>>
>>
>> On Thu, Apr 10, 2014 at 9:01 AM, Daniel-Constantin Mierla <
>> miconda(a)gmail.com wrote:
>>
>>> Hello Jason,
>>>
>>> I pushed a patch trying to fix this case, it is only on git master
>>> branch. Can you test it? If all goes fine, we can consider backporting it.
>>>
>>> Cheers,
>>> Daniel
>>>
>>>
>>> On 09/04/14 23:26, Jason Penton wrote:
>>>
>>> Hey Daniel,
>>>
>>> nothing extraordinary...
>>>
>>> # -- TM params --
>>> modparam("tm", "fr_timer", 20000);
>>> modparam("tm", "fr_inv_timer", 10000)
>>>
>>>
>>> Cheers
>>> Jason
>>>
>>>
>>> On Wed, Apr 9, 2014 at 10:32 PM, Jason Penton
<jason.penton(a)gmail.com>wrote;wrote:
>>>
>>>> Hey Daniel,
>>>>
>>>> Yes I did a test with a very basic config file and I am not able to
>>>> re-create. However, with my *complex* cfg file I can re-create every
time.
>>>> Tomorrow I will compare what is different and report back... hopefully
with
>>>> fix ;)
>>>>
>>>> here is bt of timer process deadlocking itself:
>>>>
>>>> #0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
>>>> #1 0x00007f5009f22004 in futex_get (lock=0x7f4fc55030d8) at
>>>> ../../mem/../futexlock.h:123
>>>> #2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8, file=0x7f5009f90fd1
>>>> "t_cancel.c", function=0x7f5009f91980
"cancel_branch", line=250) at
>>>> lock.h:99
>>>> #3 0x00007f5009f23271 in cancel_branch (t=0x7f4fc5501b40, branch=0,
>>>> reason=0x7fff646d03a8, flags=3) at t_cancel.c:250
>>>> #4 0x00007f5009f22c02 in cancel_uacs (t=0x7f4fc5501b40,
>>>> cancel_data=0x7fff646d03a0, flags=1) at t_cancel.c:123
>>>> #5 0x00007f5009f718c4 in _reply_light (trans=0x7f4fc5501b40,
>>>> buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR select next
>>>> S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
>>>> SIP/2.0/UDP 10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"...,
>>>> len=778, code=500, to_tag=0x7f500a1c7ae0
>>>> "c82b15d7f12ef185f95fe4945457d449-8bab", to_tag_len=37,
lock=0,
>>>> bm=0x7fff646d0b60) at t_reply.c:660
>>>> #6 0x00007f5009f7244c in _reply (trans=0x7f4fc5501b40,
>>>> p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on
LIR
>>>> select next S-CSCF", lock=0) at t_reply.c:795
>>>> #7 0x00007f5009f76436 in t_reply_unsafe (t=0x7f4fc5501b40,
>>>> p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on
LIR
>>>> select next S-CSCF") at t_reply.c:1643
>>>> #8 0x00007f5009f57621 in w_t_reply (msg=0x7f500a1c6bc0,
>>>> p1=0x7f500a2497d8 "\340\332$\nP\177", p2=0x7f500a249870
"h\321$\nP\177") at
>>>> tm.c:1324
>>>> #9 0x000000000041a700 in do_action (h=0x7fff646d1d30,
>>>> a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1119
>>>> #10 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
>>>> a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1607
>>>> #11 0x000000000041a5a4 in do_action (h=0x7fff646d1d30,
>>>> a=0x7f500a24d478, msg=0x7f500a1c6bc0) at action.c:1102
>>>> #12 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
>>>> a=0x7f500a249148, msg=0x7f500a1c6bc0) at action.c:1607
>>>> #13 0x000000000041a54e in do_action (h=0x7fff646d1d30,
>>>> a=0x7f500a24c500, msg=0x7f500a1c6bc0) at action.c:1098
>>>> #14 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
>>>> a=0x7f500a247a28, msg=0x7f500a1c6bc0) at action.c:1607
>>>> #15 0x0000000000423fdf in run_top_route (a=0x7f500a247a28,
>>>> msg=0x7f500a1c6bc0, c=0x0) at action.c:1693
>>>> #16 0x00007f5009f73815 in run_failure_handlers (t=0x7f4fc5501b40,
>>>> rpl=0xffffffffffffffff, code=408, extra_flags=96) at t_reply.c:1061
>>>> #17 0x00007f5009f7527a in t_should_relay_response
>>>> (Trans=0x7f4fc5501b40, new_code=408, branch=1,
should_store=0x7fff646d201c,
>>>> should_relay=0x7fff646d2018, cancel_data=0x7fff646d2070,
>>>> reply=0xffffffffffffffff) at t_reply.c:1416
>>>> #18 0x00007f5009f76ede in relay_reply (t=0x7f4fc5501b40,
>>>> p_msg=0xffffffffffffffff, branch=1, msg_status=408,
>>>> cancel_data=0x7fff646d2070, do_put_on_wait=0) at t_reply.c:1819
>>>> #19 0x00007f5009f44c88 in fake_reply (t=0x7f4fc5501b40, branch=1,
>>>> code=408) at timer.c:354
>>>> #20 0x00007f5009f450e7 in final_response_handler (r_buf=0x7f4fc5501e60,
>>>> t=0x7f4fc5501b40) at timer.c:526
>>>> #21 0x00007f5009f4518d in retr_buf_handler (ticks=260027386,
>>>> tl=0x7f4fc5501e80, p=0x3e8) at timer.c:584
>>>> #22 0x0000000000544119 in timer_list_expire (t=260027386,
>>>> h=0x7f4fc527cbe0, slow_l=0x7f4fc527cdf0, slow_mark=0) at timer.c:894
>>>> #23 0x0000000000544418 in timer_handler () at timer.c:959
>>>> #24 0x00000000005446b2 in timer_main () at timer.c:998
>>>> #25 0x0000000000471ddf in main_loop () at main.c:1689
>>>>
>>>>
>>>>
>>>> On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin Mierla <
>>>> miconda(a)gmail.com wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> that should not be a very rare case and I would expect to be caught
so
>>>>> far, anyhow ... this looks like easy to reproduce, have you tried
it?
>>>>>
>>>>> You can have two kamailio, one relying the invite to the second,
which
>>>>> will reply with 100, then wait for the timeout on the first instance.
You
>>>>> can add some debug messages in the code to see if the lock is called
twice.
>>>>>
>>>>> Cheers,
>>>>> Daniel
>>>>>
>>>>>
>>>>> On 09/04/14 17:51, Jason Penton wrote:
>>>>>
>>>>> Hi All,
>>>>>
>>>>> I have been experiencing a deadlock when a timeout occurs on a
>>>>> t_relayed() INVITE. Going through the code I have noticed a possible
chance
>>>>> of deadlock (without re-entrant enabled). Here is my thinking:
>>>>>
>>>>> t_should_relay_response() is called with REPLY_LOCK when the timer
>>>>> process fires on the fr_inv_timer (no response from the INVITE that
was
>>>>> relayed, other than 100 provisional) and a 408 is generated. However,
from
>>>>> within that function there are calls to run_failure_handlers() which
in
>>>>> turn *could* try and lock the reply (viz. somebody having a t_reply()
call
>>>>> in the cfg file - in failure route block). This would result in
another
>>>>> lock on the same transaction's REPLY_LOCK....
>>>>>
>>>>> Has anybody else experienced something like this?
>>>>>
>>>>> this is on master btw.
>>>>>
>>>>> Cheers
>>>>> Jason
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> sr-dev mailing
listsr-dev@lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>>>>>
>>>>>
>>>>> --
>>>>> Daniel-Constantin Mierla -
http://www.asipto.comhttp://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> sr-dev mailing list
>>>>> sr-dev(a)lists.sip-router.org
>>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>>>>>
>>>>>
>>>>
>>>
>>> --
>>> Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda
- http://www.linkedin.com/in/miconda
>>>
>>>
>>
>> --
>> Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
>>
>>
>
> --
> Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
>
>
2:48 p.m.
On 11/04/14 14:45, Jason Penton wrote:
yes okay - got it. I will test and analyse.
I
meant I want to analyze before deciding to backport, but a second
analysis is never bad :-)
Cheers,
Daniel
Thanks Daniel!
On Thu, Apr 10, 2014 at 4:35 PM, Daniel-Constantin Mierla
<miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote:
Hello,
iirc, there are several functions that script writer can use, like
t_reply_callid() from tmx. The idea is to analyze a bit in order
to detect if a forced reply may end up in canceling some pending
branches -- the reply on the branch doesnt matter anymore and
should not be considered anymore for relaying upstream, because
the script writer already decided what to send out.
Cheers,
Daniel
On 10/04/14 13:24, Jason Penton wrote:
--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Hey Daniel,
which reply functions are you referring to? API functions?
Cheers
Jason
On Thu, Apr 10, 2014 at 12:53 PM, Daniel-Constantin Mierla
<miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote:
OK. I will leave it a bit in master to see if there are any
new reports, then I will backport. I will also have to review
the tm reply functions that can be used from config to align
them to the new check.
Cheers,
Daniel
On 10/04/14 09:06, Jason Penton wrote:
--
Daniel-Constantin Mierla -http://www.asipto.com
http://twitter.com/#!/miconda <http://twitter.com/#%21/miconda>
-http://www.linkedin.com/in/miconda
oh excellent, I will look at it right
away - was just
getting ready to jump in myself ;)
Cheers
Jason
On Thu, Apr 10, 2014 at 9:01 AM, Daniel-Constantin Mierla
<miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote:
Hello Jason,
I pushed a patch trying to fix this case, it is only on
git master branch. Can you test it? If all goes fine, we
can consider backporting it.
Cheers,
Daniel
On 09/04/14 23:26, Jason Penton wrote:
--
Daniel-Constantin Mierla -http://www.asipto.com
http://twitter.com/#!/miconda <http://twitter.com/#%21/miconda>
-http://www.linkedin.com/in/miconda
Hey Daniel,
nothing extraordinary...
# -- TM params --
modparam("tm", "fr_timer", 20000);
modparam("tm", "fr_inv_timer", 10000)
Cheers
Jason
On Wed, Apr 9, 2014 at 10:32 PM, Jason Penton
<jason.penton(a)gmail.com
<mailto:jason.penton@gmail.com>> wrote:
Hey Daniel,
Yes I did a test with a very basic config file and
I am not able to re-create. However, with my
*complex* cfg file I can re-create every time.
Tomorrow I will compare what is different and
report back... hopefully with fix ;)
here is bt of timer process deadlocking itself:
#0 syscall () at
../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
#1 0x00007f5009f22004 in futex_get
(lock=0x7f4fc55030d8) at ../../mem/../futexlock.h:123
#2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8,
file=0x7f5009f90fd1 "t_cancel.c",
function=0x7f5009f91980 "cancel_branch", line=250)
at lock.h:99
#3 0x00007f5009f23271 in cancel_branch
(t=0x7f4fc5501b40, branch=0, reason=0x7fff646d03a8,
flags=3) at t_cancel.c:250
#4 0x00007f5009f22c02 in cancel_uacs
(t=0x7f4fc5501b40, cancel_data=0x7fff646d03a0,
flags=1) at t_cancel.c:123
#5 0x00007f5009f718c4 in _reply_light
(trans=0x7f4fc5501b40,
buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR
select next S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
SIP/2.0/UDP
10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"...,
len=778, code=500, to_tag=0x7f500a1c7ae0
"c82b15d7f12ef185f95fe4945457d449-8bab",
to_tag_len=37, lock=0, bm=0x7fff646d0b60) at
t_reply.c:660
#6 0x00007f5009f7244c in _reply
(trans=0x7f4fc5501b40, p_msg=0x7f500a1c6bc0,
code=500, text=0x7f500a249a48 "Server error on LIR
select next S-CSCF", lock=0) at t_reply.c:795
#7 0x00007f5009f76436 in t_reply_unsafe
(t=0x7f4fc5501b40, p_msg=0x7f500a1c6bc0, code=500,
text=0x7f500a249a48 "Server error on LIR select
next S-CSCF") at t_reply.c:1643
#8 0x00007f5009f57621 in w_t_reply
(msg=0x7f500a1c6bc0, p1=0x7f500a2497d8
"\340\332$\nP\177", p2=0x7f500a249870
"h\321$\nP\177") at tm.c:1324
#9 0x000000000041a700 in do_action
(h=0x7fff646d1d30, a=0x7f500a24cee8,
msg=0x7f500a1c6bc0) at action.c:1119
#10 0x0000000000423831 in run_actions
(h=0x7fff646d1d30, a=0x7f500a24cee8,
msg=0x7f500a1c6bc0) at action.c:1607
#11 0x000000000041a5a4 in do_action
(h=0x7fff646d1d30, a=0x7f500a24d478,
msg=0x7f500a1c6bc0) at action.c:1102
#12 0x0000000000423831 in run_actions
(h=0x7fff646d1d30, a=0x7f500a249148,
msg=0x7f500a1c6bc0) at action.c:1607
#13 0x000000000041a54e in do_action
(h=0x7fff646d1d30, a=0x7f500a24c500,
msg=0x7f500a1c6bc0) at action.c:1098
#14 0x0000000000423831 in run_actions
(h=0x7fff646d1d30, a=0x7f500a247a28,
msg=0x7f500a1c6bc0) at action.c:1607
#15 0x0000000000423fdf in run_top_route
(a=0x7f500a247a28, msg=0x7f500a1c6bc0, c=0x0) at
action.c:1693
#16 0x00007f5009f73815 in run_failure_handlers
(t=0x7f4fc5501b40, rpl=0xffffffffffffffff,
code=408, extra_flags=96) at t_reply.c:1061
#17 0x00007f5009f7527a in t_should_relay_response
(Trans=0x7f4fc5501b40, new_code=408, branch=1,
should_store=0x7fff646d201c,
should_relay=0x7fff646d2018,
cancel_data=0x7fff646d2070,
reply=0xffffffffffffffff) at t_reply.c:1416
#18 0x00007f5009f76ede in relay_reply
(t=0x7f4fc5501b40, p_msg=0xffffffffffffffff,
branch=1, msg_status=408,
cancel_data=0x7fff646d2070, do_put_on_wait=0) at
t_reply.c:1819
#19 0x00007f5009f44c88 in fake_reply
(t=0x7f4fc5501b40, branch=1, code=408) at timer.c:354
#20 0x00007f5009f450e7 in final_response_handler
(r_buf=0x7f4fc5501e60, t=0x7f4fc5501b40) at timer.c:526
#21 0x00007f5009f4518d in retr_buf_handler
(ticks=260027386, tl=0x7f4fc5501e80, p=0x3e8) at
timer.c:584
#22 0x0000000000544119 in timer_list_expire
(t=260027386, h=0x7f4fc527cbe0,
slow_l=0x7f4fc527cdf0, slow_mark=0) at timer.c:894
#23 0x0000000000544418 in timer_handler () at
timer.c:959
#24 0x00000000005446b2 in timer_main () at timer.c:998
#25 0x0000000000471ddf in main_loop () at main.c:1689
On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin
Mierla <miconda(a)gmail.com
<mailto:miconda@gmail.com>> wrote:
Hello,
that should not be a very rare case and I would
expect to be caught so far, anyhow ... this
looks like easy to reproduce, have you tried it?
You can have two kamailio, one relying the
invite to the second, which will reply with
100, then wait for the timeout on the first
instance. You can add some debug messages in
the code to see if the lock is called twice.
Cheers,
Daniel
On 09/04/14 17:51, Jason Penton wrote:
> Hi All,
>
> I have been experiencing a deadlock when a
> timeout occurs on a t_relayed() INVITE. Going
> through the code I have noticed a possible
> chance of deadlock (without re-entrant
> enabled). Here is my thinking:
>
> t_should_relay_response() is called with
> REPLY_LOCK when the timer process fires on the
> fr_inv_timer (no response from the INVITE that
> was relayed, other than 100 provisional) and a
> 408 is generated. However, from within that
> function there are calls
> to run_failure_handlers() which in turn
> *could* try and lock the reply (viz. somebody
> having a t_reply() call in the cfg file - in
> failure route block). This would result in
> another lock on the same transaction's
> REPLY_LOCK....
>
> Has anybody else experienced something like this?
>
> this is on master btw.
>
> Cheers
> Jason
>
>
> _______________________________________________
> sr-dev mailing list
> sr-dev(a)lists.sip-router.org
<mailto:sr-dev@lists.sip-router.org>
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
--
Daniel-Constantin Mierla -http://www.asipto.com
http://twitter.com/#!/miconda
<http://twitter.com/#%21/miconda> -http://www.linkedin.com/in/miconda
_______________________________________________
sr-dev mailing list
sr-dev(a)lists.sip-router.org
<mailto:sr-dev@lists.sip-router.org>
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
--
Daniel-Constantin Mierla -http://www.asipto.com
http://twitter.com/#!/miconda <http://twitter.com/#%21/miconda>
-http://www.linkedin.com/in/miconda
3 Feb
3 Feb
8:29 a.m.
Hi Daniel,
I have found another instance of a similar bug where the a process gets
itself into deadlock. The sequence of events:
1. INVITE request is relayed downstream
2. error response or locally generated 408 occurs
2. Failure route in cfg is armed and tries to relay to alternate
destination (voicemail/annoucnement server, etc) - using t_relay()
3. t_relay fails to destination for whatever reason (in this case the
result of the destination being blacklisted in TM)
4. Original reply is attempted to be relayed upstream (this is all done
safely - ie using t_reply_unsafe() as the REPLY_LOCK has already been
acquired in failure route
5. At or around line 562 of t_reply.c we check if the reply is > 200 (final
response). If it is and if its an INVITE transaction, we clean up timers
and cancel all UAC branches. This is where we hit a problem:
cancel_uacs( trans, &cancel_data, F_CANCEL_B_KILL, lock );
6. cancel_uacs calls cancel_branch if there was no response on the branch
by calling cancel_branch()
7. cancel branch calls LOCK_REPLIES(t) on the transaction and you hit
deadlock.... (original call to LOCK_REPLIES(t) happened in failure route
processing)
This use case is slightly different to the one you fixed related to
retransmission timers... (the beginning of this thread)
Suggestion: What about a pkg/process variable that can be used to check if
you have already acquired the reply lock to combat these non-reentrant
deadlocks. A side-effect of this would save on passing variables around in
various functions indicating intention to lock or not.
Thoughts?
Cheers
Jason
On Fri Apr 11 2014 at 14:48:59 Daniel-Constantin Mierla <miconda(a)gmail.com>
wrote:
On 11/04/14 14:45, Jason Penton wrote:
yes okay - got it. I will test and analyse.
I meant I want to analyze before deciding to backport, but a second
analysis is never bad :-)
Cheers,
Daniel
Thanks Daniel!
On Thu, Apr 10, 2014 at 4:35 PM, Daniel-Constantin Mierla <
miconda(a)gmail.com> wrote:
Hello,
iirc, there are several functions that script writer can use, like
t_reply_callid() from tmx. The idea is to analyze a bit in order to detect
if a forced reply may end up in canceling some pending branches -- the
reply on the branch doesnt matter anymore and should not be considered
anymore for relaying upstream, because the script writer already decided
what to send out.
Cheers,
Daniel
On 10/04/14 13:24, Jason Penton wrote:
Hey Daniel,
which reply functions are you referring to? API functions?
Cheers
Jason
On Thu, Apr 10, 2014 at 12:53 PM, Daniel-Constantin Mierla <
miconda(a)gmail.com> wrote:
--
Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
OK. I will leave it a bit in master to see if
there are any new
reports, then I will backport. I will also have to review the tm reply
functions that can be used from config to align them to the new check.
Cheers,
Daniel
On 10/04/14 09:06, Jason Penton wrote:
oh excellent, I will look at it right away - was just getting ready to
jump in myself ;)
Cheers
Jason
On Thu, Apr 10, 2014 at 9:01 AM, Daniel-Constantin Mierla <
miconda(a)gmail.com> wrote:
--
Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
Hello Jason,
I pushed a patch trying to fix this case, it is only on git master
branch. Can you test it? If all goes fine, we can consider backporting it.
Cheers,
Daniel
On 09/04/14 23:26, Jason Penton wrote:
Hey Daniel,
nothing extraordinary...
# -- TM params --
modparam("tm", "fr_timer", 20000);
modparam("tm", "fr_inv_timer", 10000)
Cheers
Jason
On Wed, Apr 9, 2014 at 10:32 PM, Jason Penton <jason.penton(a)gmail.com>
wrote:
> Hey Daniel,
>
> Yes I did a test with a very basic config file and I am not able to
> re-create. However, with my *complex* cfg file I can re-create every time.
> Tomorrow I will compare what is different and report back... hopefully with
> fix ;)
>
> here is bt of timer process deadlocking itself:
>
> #0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:39
> #1 0x00007f5009f22004 in futex_get (lock=0x7f4fc55030d8) at
> ../../mem/../futexlock.h:123
> #2 0x00007f5009f223e1 in _lock (s=0x7f4fc55030d8, file=0x7f5009f90fd1
> "t_cancel.c", function=0x7f5009f91980 "cancel_branch", line=250)
at
> lock.h:99
> #3 0x00007f5009f23271 in cancel_branch (t=0x7f4fc5501b40, branch=0,
> reason=0x7fff646d03a8, flags=3) at t_cancel.c:250
> #4 0x00007f5009f22c02 in cancel_uacs (t=0x7f4fc5501b40,
> cancel_data=0x7fff646d03a0, flags=1) at t_cancel.c:123
> #5 0x00007f5009f718c4 in _reply_light (trans=0x7f4fc5501b40,
> buf=0x7f500a24dc68 "SIP/2.0 500 Server error on LIR select next
> S-CSCF\r\nVia: SIP/2.0/UDP
10.0.1.167:6060;branch=z9hG4bKb7.2ae09f29ffbd0034cd6d58483053603b.1\r\nVia:
> SIP/2.0/UDP 10.0.1.166:4060;branch=z9hG4bKb7.3faa03ddea80"...,
> len=778, code=500, to_tag=0x7f500a1c7ae0
> "c82b15d7f12ef185f95fe4945457d449-8bab", to_tag_len=37, lock=0,
> bm=0x7fff646d0b60) at t_reply.c:660
> #6 0x00007f5009f7244c in _reply (trans=0x7f4fc5501b40,
> p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
> select next S-CSCF", lock=0) at t_reply.c:795
> #7 0x00007f5009f76436 in t_reply_unsafe (t=0x7f4fc5501b40,
> p_msg=0x7f500a1c6bc0, code=500, text=0x7f500a249a48 "Server error on LIR
> select next S-CSCF") at t_reply.c:1643
> #8 0x00007f5009f57621 in w_t_reply (msg=0x7f500a1c6bc0,
> p1=0x7f500a2497d8 "\340\332$\nP\177", p2=0x7f500a249870
"h\321$\nP\177") at
> tm.c:1324
> #9 0x000000000041a700 in do_action (h=0x7fff646d1d30,
> a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1119
> #10 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
> a=0x7f500a24cee8, msg=0x7f500a1c6bc0) at action.c:1607
> #11 0x000000000041a5a4 in do_action (h=0x7fff646d1d30,
> a=0x7f500a24d478, msg=0x7f500a1c6bc0) at action.c:1102
> #12 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
> a=0x7f500a249148, msg=0x7f500a1c6bc0) at action.c:1607
> #13 0x000000000041a54e in do_action (h=0x7fff646d1d30,
> a=0x7f500a24c500, msg=0x7f500a1c6bc0) at action.c:1098
> #14 0x0000000000423831 in run_actions (h=0x7fff646d1d30,
> a=0x7f500a247a28, msg=0x7f500a1c6bc0) at action.c:1607
> #15 0x0000000000423fdf in run_top_route (a=0x7f500a247a28,
> msg=0x7f500a1c6bc0, c=0x0) at action.c:1693
> #16 0x00007f5009f73815 in run_failure_handlers (t=0x7f4fc5501b40,
> rpl=0xffffffffffffffff, code=408, extra_flags=96) at t_reply.c:1061
> #17 0x00007f5009f7527a in t_should_relay_response
> (Trans=0x7f4fc5501b40, new_code=408, branch=1, should_store=0x7fff646d201c,
> should_relay=0x7fff646d2018, cancel_data=0x7fff646d2070,
> reply=0xffffffffffffffff) at t_reply.c:1416
> #18 0x00007f5009f76ede in relay_reply (t=0x7f4fc5501b40,
> p_msg=0xffffffffffffffff, branch=1, msg_status=408,
> cancel_data=0x7fff646d2070, do_put_on_wait=0) at t_reply.c:1819
> #19 0x00007f5009f44c88 in fake_reply (t=0x7f4fc5501b40, branch=1,
> code=408) at timer.c:354
> #20 0x00007f5009f450e7 in final_response_handler
> (r_buf=0x7f4fc5501e60, t=0x7f4fc5501b40) at timer.c:526
> #21 0x00007f5009f4518d in retr_buf_handler (ticks=260027386,
> tl=0x7f4fc5501e80, p=0x3e8) at timer.c:584
> #22 0x0000000000544119 in timer_list_expire (t=260027386,
> h=0x7f4fc527cbe0, slow_l=0x7f4fc527cdf0, slow_mark=0) at timer.c:894
> #23 0x0000000000544418 in timer_handler () at timer.c:959
> #24 0x00000000005446b2 in timer_main () at timer.c:998
> #25 0x0000000000471ddf in main_loop () at main.c:1689
>
>
>
> On Wed, Apr 9, 2014 at 9:34 PM, Daniel-Constantin Mierla <
> miconda(a)gmail.com> wrote:
>
>> Hello,
>>
>> that should not be a very rare case and I would expect to be caught
>> so far, anyhow ... this looks like easy to reproduce, have you tried it?
>>
>> You can have two kamailio, one relying the invite to the second,
>> which will reply with 100, then wait for the timeout on the first instance.
>> You can add some debug messages in the code to see if the lock is called
>> twice.
>>
>> Cheers,
>> Daniel
>>
>>
>> On 09/04/14 17:51, Jason Penton wrote:
>>
>> Hi All,
>>
>> I have been experiencing a deadlock when a timeout occurs on a
>> t_relayed() INVITE. Going through the code I have noticed a possible chance
>> of deadlock (without re-entrant enabled). Here is my thinking:
>>
>> t_should_relay_response() is called with REPLY_LOCK when the timer
>> process fires on the fr_inv_timer (no response from the INVITE that was
>> relayed, other than 100 provisional) and a 408 is generated. However, from
>> within that function there are calls to run_failure_handlers() which in
>> turn *could* try and lock the reply (viz. somebody having a t_reply() call
>> in the cfg file - in failure route block). This would result in another
>> lock on the same transaction's REPLY_LOCK....
>>
>> Has anybody else experienced something like this?
>>
>> this is on master btw.
>>
>> Cheers
>> Jason
>>
>>
>> _______________________________________________
>> sr-dev mailing
listsr-dev@lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>>
>>
>> --
>> Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
>>
>>
>> _______________________________________________
>> sr-dev mailing list
>> sr-dev(a)lists.sip-router.org
>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>>
>>
>
--
Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
--
Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda -
http://www.linkedin.com/in/miconda
3:27 p.m.
Hi Jason,
On 03/02/15 08:29, Jason Penton wrote:
Hi Daniel,
I have found another instance of a similar bug where the a process
gets itself into deadlock. The sequence of events:
1. INVITE request is relayed downstream
2. error response or locally generated 408 occurs
2. Failure route in cfg is armed and tries to relay to alternate
destination (voicemail/annoucnement server, etc) - using t_relay()
3. t_relay fails to destination for whatever reason (in this case the
result of the destination being blacklisted in TM)
4. Original reply is attempted to be relayed upstream (this is all
done safely - ie using t_reply_unsafe() as the REPLY_LOCK has already
been acquired in failure route
5. At or around line 562 of t_reply.c we check if the reply is > 200
(final response). If it is and if its an INVITE transaction, we clean
up timers and cancel all UAC branches. This is where we hit a problem:
cancel_uacs( trans, &cancel_data, F_CANCEL_B_KILL, lock );
6. cancel_uacs calls cancel_branch if there was no response on the
branch by calling cancel_branch()
7. cancel branch calls LOCK_REPLIES(t) on the transaction and you hit
deadlock.... (original call to LOCK_REPLIES(t) happened in failure
route processing)
This use case is slightly different to the one you fixed related to
retransmission timers... (the beginning of this thread)
Suggestion: What about a pkg/process variable that can be used to
check if you have already acquired the reply lock to combat these
non-reentrant deadlocks. A side-effect of this would save on passing
variables around in various functions indicating intention to lock or
not.
Thoughts?
What about making the reply lock re-entrant? I think it should be safer
in long term to allow parts of code executed by same process to safely
acquire the lock without worrying if the same process did it before.
Global variables in pkg would need more complex management to set, test
and reset.
Cheers,
Daniel
--
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
30 Mar
30 Mar
5:03 p.m.
Hi Jason,
On 03/02/15 15:27, Daniel-Constantin Mierla wrote:
Hi Jason,
On 03/02/15 08:29, Jason Penton wrote:
I made the reply lock re-entrant, this should handle the situation you
were exposing it. if you have a chance to simulate it, then let me know
the result.
On a slightly different idea, I wonder if async_mutex should be made
re-entrant as well, what do you think? I guess it is unlikely to get two
async attempts in the same process, but you know better how the mutex is
planned to be used.
Cheers,
Daniel
--
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, May 27-29, 2015
Berlin, Germany - http://www.kamailioworld.com
Hi Daniel,
I have found another instance of a similar bug where the a process
gets itself into deadlock. The sequence of events:
1. INVITE request is relayed downstream
2. error response or locally generated 408 occurs
2. Failure route in cfg is armed and tries to relay to alternate
destination (voicemail/annoucnement server, etc) - using t_relay()
3. t_relay fails to destination for whatever reason (in this case the
result of the destination being blacklisted in TM)
4. Original reply is attempted to be relayed upstream (this is all
done safely - ie using t_reply_unsafe() as the REPLY_LOCK has already
been acquired in failure route
5. At or around line 562 of t_reply.c we check if the reply is > 200
(final response). If it is and if its an INVITE transaction, we clean
up timers and cancel all UAC branches. This is where we hit a problem:
cancel_uacs( trans, &cancel_data, F_CANCEL_B_KILL, lock );
6. cancel_uacs calls cancel_branch if there was no response on the
branch by calling cancel_branch()
7. cancel branch calls LOCK_REPLIES(t) on the transaction and you hit
deadlock.... (original call to LOCK_REPLIES(t) happened in failure
route processing)
This use case is slightly different to the one you fixed related to
retransmission timers... (the beginning of this thread)
Suggestion: What about a pkg/process variable that can be used to
check if you have already acquired the reply lock to combat these
non-reentrant deadlocks. A side-effect of this would save on passing
variables around in various functions indicating intention to lock or
not.
Thoughts?
What about making the reply lock re-entrant? I think it should be safer
in long term to allow parts of code executed by same process to safely
acquire the lock without worrying if the same process did it before.
Global variables in pkg would need more complex management to set, test
and reset.
9 Apr
9 Apr
5:07 p.m.
Hey Daniel,
Ok great, I will test. No I don't see a need to make async_mutex re-entrant
but let me check.
I will test your change too. Do you have a commit ref for your change?
Cheers
Jason
On Mon, 30 Mar 2015 at 17:03 Daniel-Constantin Mierla <miconda(a)gmail.com>
wrote:
Hi Jason,
On 03/02/15 15:27, Daniel-Constantin Mierla wrote:
Hi Jason,
On 03/02/15 08:29, Jason Penton wrote:
I made the reply lock re-entrant, this should handle the situation you
were exposing it. if you have a chance to simulate it, then let me know
the result.
On a slightly different idea, I wonder if async_mutex should be made
re-entrant as well, what do you think? I guess it is unlikely to get two
async attempts in the same process, but you know better how the mutex is
planned to be used.
Cheers,
Daniel
--
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, May 27-29, 2015
Berlin, Germany - http://www.kamailioworld.com
Hi Daniel,
I have found another instance of a similar bug where the a process
gets itself into deadlock. The sequence of events:
1. INVITE request is relayed downstream
2. error response or locally generated 408 occurs
2. Failure route in cfg is armed and tries to relay to alternate
destination (voicemail/annoucnement server, etc) - using t_relay()
3. t_relay fails to destination for whatever reason (in this case the
result of the destination being blacklisted in TM)
4. Original reply is attempted to be relayed upstream (this is all
done safely - ie using t_reply_unsafe() as the REPLY_LOCK has already
been acquired in failure route
5. At or around line 562 of t_reply.c we check if the reply is > 200
(final response). If it is and if its an INVITE transaction, we clean
up timers and cancel all UAC branches. This is where we hit a problem:
cancel_uacs( trans, &cancel_data, F_CANCEL_B_KILL, lock );
6. cancel_uacs calls cancel_branch if there was no response on the
branch by calling cancel_branch()
7. cancel branch calls LOCK_REPLIES(t) on the transaction and you hit
deadlock.... (original call to LOCK_REPLIES(t) happened in failure
route processing)
This use case is slightly different to the one you fixed related to
retransmission timers... (the beginning of this thread)
Suggestion: What about a pkg/process variable that can be used to
check if you have already acquired the reply lock to combat these
non-reentrant deadlocks. A side-effect of this would save on passing
variables around in various functions indicating intention to lock or
not.
Thoughts?
What about making the reply lock re-entrant? I think it should be safer
in long term to allow parts of code executed by same process to safely
acquire the lock without worrying if the same process did it before.
Global variables in pkg would need more complex management to set, test
and reset.
3304
days inactive
3669
days old
16 comments
2 participants
participants (2)
-
Daniel-Constantin Mierla -
Jason Penton