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<p>Hello,<br>
</p>
<br>
<div class="moz-cite-prefix">On 12.01.18 11:48, Sebastian Damm
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABkWSFy9Yiii4OSGdtH-Tr-5knLmra3tR0A_O7+6noJJT8xwvg@mail.gmail.com">
<div dir="ltr">Hi Daniel,
<div><br>
</div>
<div>unless there is a silent exit from some module (those extra
routes just write some information into redis), I can't find
any other drop and exits than the one in the route posted. </div>
<div><br>
</div>
<div>We have added some logging around the lock functions, and
although we are missing some log lines for some packets,
making it look like some locks don't get released, we do see
that another PID can successfully lock the same key later.</div>
<div><br>
</div>
<div>There is no other lock/unlock in the config.</div>
<div><br>
</div>
<div>Is there a way to debug the lock array?</div>
</div>
</blockquote>
attaching with gdb and looking at the values is always an option.
Otherwise, I do not recall anything for this purpose written in
kamailio.<br>
<br>
<blockquote type="cite"
cite="mid:CABkWSFy9Yiii4OSGdtH-Tr-5knLmra3tR0A_O7+6noJJT8xwvg@mail.gmail.com">
<div dir="ltr">
<div> One guess could be that the lock array is full, although
we already have the lock size set to 10.</div>
</div>
</blockquote>
<br>
Lock array cannot become "full", if you thought like that if there
are 10 lock operations with different keys on an array of 10 locks.<br>
<br>
Actually many string keys can use same lock/mutex -- a hashing
function is performed over the key value results in an integer value
which then is made modulo number of locks and the lock at that index
is chosen from the array. So if you do lock("abc") and then you
don't release it, then lock("xyz") can get blocked. Also, doing
unlock("xyz") without lock("xyz") is releasing the lock("abc") --
note that "abc" and "xyz" are just random example to explain what
can happen, but does not mean it happens for these keys.<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<blockquote type="cite"
cite="mid:CABkWSFy9Yiii4OSGdtH-Tr-5knLmra3tR0A_O7+6noJJT8xwvg@mail.gmail.com">
<div dir="ltr">
<div><br>
</div>
<div>Regards,</div>
<div>Sebastian<br>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Fri, Jan 12, 2018 at 11:08 AM,
Daniel-Constantin Mierla <span dir="ltr"><<a
href="mailto:miconda@gmail.com" target="_blank"
moz-do-not-send="true">miconda@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Hello,</p>
<p>have you checked that any of the route blocks used
in between lock() and unlock() don't do an exit/drop
(also not return 0)?</p>
<p>Do you have other lock() / unlock() in the config?<br>
</p>
<p>Cheers,<br>
Daniel<br>
</p>
<div>
<div class="h5"> <br>
<div class="m_8714090039324674859moz-cite-prefix">On
12.01.18 08:49, Sebastian Damm wrote:<br>
</div>
</div>
</div>
<blockquote type="cite">
<div>
<div class="h5">
<div dir="ltr">Hi,
<div><br>
</div>
<div>this morning, two Kamailio servers
suddenly stopped working after having worked
without a problem for months. Both are
running 5.0.2 on Debian Jessie. Those
systems only analyze mirrored traffic and
write some information to a RabbitMQ.</div>
<div><br>
</div>
<div>I tried restarting, but after a few
seconds they get stuck the same way as
before. Then I attached a gdb to some of the
UDP listeners, and they all look pretty much
the same.</div>
<div><br>
</div>
<div><br>
</div>
<div>===========8< process 1
=================</div>
<div>
<div>(gdb) bt</div>
<div>#0 0x00007f404ca435b9 in syscall ()
from /lib/x86_64-linux-gnu/libc.so.<wbr>6</div>
<div>#1 0x00007f4049f41260 in futex_get
(lock=0x7f4041bccd00) at
../../core/parser/../mem/../<wbr>futexlock.h:108</div>
<div>#2 0x00007f4049f477d7 in
cfg_lock_helper (lkey=0x7fff3c048650,
mode=0) at cfgutils.c:667</div>
<div>#3 0x00007f4049f481ed in
w_cfg_lock_wrapper (msg=0x7f404ba17f18,
key=0x7f404ba15488, mode=0) at
cfgutils.c:712</div>
<div>#4 0x00007f4049f4823c in w_cfg_lock
(msg=0x7f404ba17f18, key=0x7f404ba15488
"\210a\241K@\177", s2=0x0) at
cfgutils.c:717</div>
<div>#5 0x000000000045cd85 in do_action
(h=0x7fff3c049410, a=0x7f404b9d5170,
msg=0x7f404ba17f18) at core/action.c:1060</div>
<div>#6 0x0000000000469afa in run_actions
(h=0x7fff3c049410, a=0x7f404b9d5170,
msg=0x7f404ba17f18) at core/action.c:1552</div>
<div>#7 0x000000000045958d in do_action
(h=0x7fff3c049410, a=0x7f404b9ce558,
msg=0x7f404ba17f18) at core/action.c:678</div>
<div>#8 0x0000000000469afa in run_actions
(h=0x7fff3c049410, a=0x7f404b9cdf70,
msg=0x7f404ba17f18) at core/action.c:1552</div>
<div>#9 0x000000000046a2bd in run_top_route
(a=0x7f404b9cdf70, msg=0x7f404ba17f18,
c=0x0) at core/action.c:1641</div>
<div>#10 0x0000000000580033 in receive_msg (</div>
<div> buf=0xa393f9 <buf+121>
"REGISTER <a
class="m_8714090039324674859moz-txt-link-freetext"
moz-do-not-send="true">sip:domain</a>
SIP/2.0\r\nVia: SIP/2.0/UDP
1.2.3.4;branch=z9hG4bKfc98.<wbr>c762d7151f110c7eb71fc7d4e0648f<wbr>1f.0\r\nVia:
SIP/2.0/UDP 192.168.0.3:5060;rport=38020;<wbr>received=62.30.8.128;branch=<wbr>z9hG4"...,</div>
<div> len=799, rcv_info=0x7fff3c049810)
at core/receive.c:264</div>
<div>#11 0x00007f40483efcdf in
parsing_hepv3_message (buf=0xa39380
<buf> "HEP3\003\230", len=920) at
hep.c:499</div>
<div>#12 0x00007f40483ee264 in
hepv3_received (buf=0xa39380 <buf>
"HEP3\003\230", len=920,
ri=0x7fff3c049a50) at hep.c:231</div>
<div>#13 0x00007f40483ec9cb in
hep_msg_received (data=0x7fff3c049a30) at
hep.c:85</div>
<div>#14 0x000000000049e4e1 in sr_event_exec
(type=7, data=0x7fff3c049a30) at
core/events.c:263</div>
<div>#15 0x000000000048731a in udp_rcv_loop
() at core/udp_server.c:466</div>
<div>#16 0x0000000000422d08 in main_loop ()
at main.c:1623</div>
<div>#17 0x000000000042a408 in main
(argc=13, argv=0x7fff3c049ef8) at
main.c:2643</div>
<div>(gdb) quit</div>
</div>
<div>
<div>===========8< process 1
=================</div>
</div>
<div>
<div><br>
</div>
<div><br>
</div>
<div>
<div>===========8< process 2
=================</div>
</div>
<div>(gdb) bt</div>
<div>#0 0x00007f404ca435b9 in syscall ()
from /lib/x86_64-linux-gnu/libc.so.<wbr>6</div>
<div>#1 0x00007f4049f41260 in futex_get
(lock=0x7f4041bccd00) at
../../core/parser/../mem/../<wbr>futexlock.h:108</div>
<div>#2 0x00007f4049f477d7 in
cfg_lock_helper (lkey=0x7fff3c048650,
mode=0) at cfgutils.c:667</div>
<div>#3 0x00007f4049f481ed in
w_cfg_lock_wrapper (msg=0x7f404ba17f18,
key=0x7f404ba15488, mode=0) at
cfgutils.c:712</div>
<div>#4 0x00007f4049f4823c in w_cfg_lock
(msg=0x7f404ba17f18, key=0x7f404ba15488
"\210a\241K@\177", s2=0x0) at
cfgutils.c:717</div>
<div>#5 0x000000000045cd85 in do_action
(h=0x7fff3c049600, a=0x7f404b9d5170,
msg=0x7f404ba17f18) at core/action.c:1060</div>
<div>#6 0x0000000000469afa in run_actions
(h=0x7fff3c049600, a=0x7f404b9d5170,
msg=0x7f404ba17f18) at core/action.c:1552</div>
<div>#7 0x000000000045958d in do_action
(h=0x7fff3c049600, a=0x7f404b9cf920,
msg=0x7f404ba17f18) at core/action.c:678</div>
<div>#8 0x0000000000469afa in run_actions
(h=0x7fff3c049600, a=0x7f404b9ce9c0,
msg=0x7f404ba17f18) at core/action.c:1552</div>
<div>#9 0x000000000046a2bd in run_top_route
(a=0x7f404b9ce9c0, msg=0x7f404ba17f18,
c=0x7fff3c049600) at core/action.c:1641</div>
<div>#10 0x0000000000580a69 in receive_msg (</div>
<div> buf=0xa393f9 <buf+121>
"SIP/2.0 200 OK\r\nVia: SIP/2.0/UDP
172.20.40.8;branch=<wbr>z9hG4bKa69c.<wbr>5cca5a54c4d270c515eeb4bbb5e0bb<wbr>44.0\r\nVia:
SIP/2.0/UDP <a href="http://2.3.4.5:5060"
target="_blank" moz-do-not-send="true">2.3.4.5:5060</a>\r\nContact:
<a
class="m_8714090039324674859moz-txt-link-rfc2396E"
moz-do-not-send="true"><sip:1234567@9.8.7.6:59669;<wbr>transport=UDP></a>\r\nTo:
"..., len=506, rcv_info=0x7fff3c049810) at
core/receive.c:327</div>
<div>#11 0x00007f40483efcdf in
parsing_hepv3_message (buf=0xa39380
<buf> "HEP3\002s", len=627) at
hep.c:499</div>
<div>#12 0x00007f40483ee264 in
hepv3_received (buf=0xa39380 <buf>
"HEP3\002s", len=627, ri=0x7fff3c049a50)
at hep.c:231</div>
<div>#13 0x00007f40483ec9cb in
hep_msg_received (data=0x7fff3c049a30) at
hep.c:85</div>
<div>#14 0x000000000049e4e1 in sr_event_exec
(type=7, data=0x7fff3c049a30) at
core/events.c:263</div>
<div>#15 0x000000000048731a in udp_rcv_loop
() at core/udp_server.c:466</div>
<div>#16 0x0000000000422d08 in main_loop ()
at main.c:1623</div>
<div>#17 0x000000000042a408 in main
(argc=13, argv=0x7fff3c049ef8) at
main.c:2643</div>
<div>(gdb) quit</div>
</div>
<div>
<div>===========8< process 2
=================</div>
<div><br>
</div>
<div>Looks to me as if Kamailio gets stuck
trying to get a lock for this packet. </div>
<div><br>
</div>
<div>The config file when handling those
packets looks like this:</div>
<div><br>
</div>
<div>
<div>request_route {</div>
<div> route(initialize_variables);<br>
</div>
<div> route(foo);</div>
<div>}</div>
<div><br>
</div>
<div>onreply_route {</div>
<div> route(initialize_variables);<br>
</div>
<div> route(foo);</div>
<div>}</div>
</div>
<div><br>
</div>
<div>
<div>route[initialize_variables] {</div>
<div> $vn(bar) = $null;</div>
<div> $vn(baz) = $null;</div>
<div>
<div> $vn(barbaz) = $null;</div>
</div>
<div>
<div> $vn(foobar) = $null;</div>
</div>
<div><br>
</div>
<div>}<br>
</div>
</div>
<div><br>
</div>
<div>
<div>route[foo] {</div>
<div> lock("$ci");</div>
<div> xlog("L_DBG", "Obtained lock,
calling lua...\n");</div>
<div> if(!lua_run("handle_packet"))
{</div>
<div> xlog("L_ERR",
"SCRIPT: failed to execute lua
function!\n");</div>
<div> }</div>
<div><br>
</div>
<div> if ($vn(bar) != $null) {</div>
<div> route(mediaIpToRedis);</div>
<div> }</div>
<div><br>
</div>
<div> if ($vn(baz) != $null) {</div>
<div> route(channelInfoToRedis);</div>
<div> }</div>
<div><br>
</div>
<div> if ($vn(barbaz) != $null) {</div>
<div> route(sendToQueue);</div>
<div> }</div>
<div> xlog("L_DBG", "All finished,
releasing lock...\n");</div>
<div> unlock("$ci");</div>
<div> xlog("L_DBG", "Released
lock...\n");</div>
<div><br>
</div>
<div> # update stats</div>
<div> if ($vn(foobar) != $null) {</div>
<div>
update_stat("$vn(foobar)", "+1");</div>
<div> }</div>
<div><br>
</div>
<div> drop;</div>
<div> exit;</div>
<div>}</div>
</div>
<div><br>
</div>
<div>Is there any race condition I am
missing? Until this morning, it ran
without problems and only every 2 minutes
or so, 4 packets were sent to the
RabbitMQ. So the system throws away nearly
100% of the traffic (which is around 20
Mbit). </div>
<div><br>
</div>
<div>In the log file, there are no errors at
all, no aborted lua scripts or whatsoever.</div>
<div><br>
</div>
<div>Does anybody have a hint for me? Thanks
in advance.</div>
<div><br>
</div>
<div>Regards</div>
<div>Sebastian</div>
</div>
</div>
<br>
<fieldset
class="m_8714090039324674859mimeAttachmentHeader"></fieldset>
<br>
</div>
</div>
<pre>______________________________<wbr>_________________
Kamailio (SER) - Users Mailing List
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<a class="m_8714090039324674859moz-txt-link-freetext" href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users" target="_blank" moz-do-not-send="true">https://lists.kamailio.org/<wbr>cgi-bin/mailman/listinfo/sr-<wbr>users</a><span class="HOEnZb"><font color="#888888">
</font></span></pre>
<span class="HOEnZb"><font color="#888888"> </font></span></blockquote>
<span class="HOEnZb"><font color="#888888"> <br>
<pre class="m_8714090039324674859moz-signature" cols="72">--
Daniel-Constantin Mierla
<a class="m_8714090039324674859moz-txt-link-abbreviated" href="http://www.twitter.com/miconda" target="_blank" moz-do-not-send="true">www.twitter.com/miconda</a> -- <a class="m_8714090039324674859moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda" target="_blank" moz-do-not-send="true">www.linkedin.com/in/miconda</a>
Kamailio Advanced Training - March 5-7, 2018, Berlin - <a class="m_8714090039324674859moz-txt-link-abbreviated" href="http://www.asipto.com" target="_blank" moz-do-not-send="true">www.asipto.com</a>
Kamailio World Conference - May 14-16, 2018 - <a class="m_8714090039324674859moz-txt-link-abbreviated" href="http://www.kamailioworld.com" target="_blank" moz-do-not-send="true">www.kamailioworld.com</a></pre>
</font></span></div>
</blockquote>
</div>
<br>
<br clear="all">
<div><br>
</div>
</div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Kamailio (SER) - Users Mailing List
<a class="moz-txt-link-abbreviated" href="mailto:sr-users@lists.kamailio.org">sr-users@lists.kamailio.org</a>
<a class="moz-txt-link-freetext" href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users</a>
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla
<a class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a>
Kamailio Advanced Training - March 5-7, 2018, Berlin - <a class="moz-txt-link-abbreviated" href="http://www.asipto.com">www.asipto.com</a>
Kamailio World Conference - May 14-16, 2018 - <a class="moz-txt-link-abbreviated" href="http://www.kamailioworld.com">www.kamailioworld.com</a></pre>
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