[SR-Users] Core crash in del_lump() "offset exceeds message size" when using subst() inside tm:local-request route.

Mon Jul 31 08:11:57 CEST 2017

Hello,

what's the version of Kamailio and the operating system you run on?

Cheers,
Daniel

On 28.07.17 23:53, Cody Herzog wrote:
>
> Hello.
>
>  
>
> Inside the tm:local-request route, I am trying to modify the body of
> outgoing NOTIFY messages using the subst_body() function.
>
>  
>
> Things seem to work fine most of the time. The NOTIFY messages are
> correctly modified. However, I will very rarely hit a crash.
>
>  
>
> I can force the crash to happen more quickly by stress testing with
> thousands of NOTIFY messages being modified.
>
>  
>
> Is it safe to call subst() or subst_body() inside the tm:local-request
> route? If not, is there another way I can modify the outgoing NOTIFY
> messages safely?
>
>  
>
> Note that I am also calling append_hf() inside the same
> tm:local-request route, but that has been working for a very long time
> without causing any problems. Could there be some kind of bad
> interaction between append_hf() and subst_body()?
>
>  
>
> Strangely, it seems like using subst() makes the crash more likely to
> happen. For some reason, subst_body() seems to be more robust.
>
>  
>
> Here are the logs I see:
>
>  
>
> ---------
>
> Jul 28 10:57:40 SIPCOMM-VEGAS-TEST /usr/local/sbin/kamailio[2476]:
> CRITICAL: <core> [data_lump.c:292]: del_lump(): offset exceeds message
> size (1625 > 1194) aborting...
>
> Jul 28 10:57:43 SIPCOMM-VEGAS-TEST /usr/local/sbin/kamailio[2481]:
> CRITICAL: <core> [pass_fd.c:275]: receive_fd(): EOF on 53
>
> Jul 28 10:57:44 SIPCOMM-VEGAS-TEST /usr/local/sbin/kamailio[2367]:
> ALERT: <core> [main.c:731]: handle_sigs(): child process 2476 exited
> by a signal 6
>
> Jul 28 10:57:44 SIPCOMM-VEGAS-TEST /usr/local/sbin/kamailio[2367]:
> ALERT: <core> [main.c:734]: handle_sigs(): core was generated
>
> Jul 28 10:57:44 SIPCOMM-VEGAS-TEST /usr/local/sbin/kamailio[2367]:
> INFO: <core> [main.c:756]: handle_sigs(): terminating due to SIGCHLD
>
> ---------
>
>  
>
> Here is a GDB back trace from the core dump:
>
> ---------
>
> #0  0x00007fd91a567c37 in __GI_raise (sig=sig at entry=6) at
> ../nptl/sysdeps/unix/sysv/linux/raise.c:56
>
> #1  0x00007fd91a56b028 in __GI_abort () at abort.c:89
>
> #2  0x000000000044e981 in del_lump (msg=0x7fd917c5ed60 <lreq>,
> offset=1625, len=20, type=HDR_OTHER_T) at data_lump.c:293
>
> #3  0x00007fd91676297f in subst_f (msg=0x7fd917c5ed60 <lreq>,
> subst=0x7fd919e5ccc0 "\320\356\345\031\331\177", ignored=0x0) at
> textops.c:681
>
> #4  0x000000000041e1dd in do_action (h=0x7ffd364b87c0,
> a=0x7fd919e9b438, msg=0x7fd917c5ed60 <lreq>) at action.c:1059
>
> #5  0x000000000042a917 in run_actions (h=0x7ffd364b87c0,
> a=0x7fd919e9b438, msg=0x7fd917c5ed60 <lreq>) at action.c:1548
>
> #6  0x000000000042af94 in run_actions_safe (h=0x7ffd364ba5b0,
> a=0x7fd919e9b438, msg=0x7fd917c5ed60 <lreq>) at action.c:1613
>
> #7  0x0000000000549972 in rval_get_int (h=0x7ffd364ba5b0,
> msg=0x7fd917c5ed60 <lreq>, i=0x7ffd364b8b58, rv=0x7fd919e9ced8,
> cache=0x0) at rvalue.c:912
>
> #8  0x000000000054dc7c in rval_expr_eval_int (h=0x7ffd364ba5b0,
> msg=0x7fd917c5ed60 <lreq>, res=0x7ffd364b8b58, rve=0x7fd919e9ced0) at
> rvalue.c:1910
>
> #9  0x000000000041dc52 in do_action (h=0x7ffd364ba5b0,
> a=0x7fd919e9d990, msg=0x7fd917c5ed60 <lreq>) at action.c:1029
>
> #10 0x000000000042a917 in run_actions (h=0x7ffd364ba5b0,
> a=0x7fd919e9d990, msg=0x7fd917c5ed60 <lreq>) at action.c:1548
>
> #11 0x000000000041e0c4 in do_action (h=0x7ffd364ba5b0,
> a=0x7fd919e9dad8, msg=0x7fd917c5ed60 <lreq>) at action.c:1044
>
> #12 0x000000000042a917 in run_actions (h=0x7ffd364ba5b0,
> a=0x7fd919e973b8, msg=0x7fd917c5ed60 <lreq>) at action.c:1548
>
> #13 0x000000000041ab46 in do_action (h=0x7ffd364ba5b0,
> a=0x7fd919e95d70, msg=0x7fd917c5ed60 <lreq>) at action.c:677
>
> #14 0x000000000042a917 in run_actions (h=0x7ffd364ba5b0,
> a=0x7fd919e8f330, msg=0x7fd917c5ed60 <lreq>) at action.c:1548
>
> #15 0x000000000041e0c4 in do_action (h=0x7ffd364ba5b0,
> a=0x7fd919e95eb8, msg=0x7fd917c5ed60 <lreq>) at action.c:1044
>
> #16 0x000000000042a917 in run_actions (h=0x7ffd364ba5b0,
> a=0x7fd919e8c8e0, msg=0x7fd917c5ed60 <lreq>) at action.c:1548
>
> #17 0x000000000042b07d in run_top_route (a=0x7fd919e8c8e0,
> msg=0x7fd917c5ed60 <lreq>, c=0x0) at action.c:1634
>
> #18 0x00007fd917a0539a in t_uac_prepare (uac_r=0x7ffd364baf20,
> dst_req=0x7ffd364ba8f0, dst_cell=0x7ffd364ba8f8) at uac.c:391
>
> #19 0x00007fd917a07945 in t_uac_with_ids (uac_r=0x7ffd364baf20,
> ret_index=0x0, ret_label=0x0) at uac.c:599
>
> #20 0x00007fd917a07918 in t_uac (uac_r=0x7ffd364baf20) at uac.c:584
>
> #21 0x00007fd917a09b9e in req_within (uac_r=0x7ffd364baf20) at uac.c:802
>
> #22 0x00007fd914674052 in send_notify_request (subs=0x7ffd364bb200,
> watcher_subs=0x0, n_body=0x0, force_null_body=0) at notify.c:1600
>
> #23 0x00007fd9146754b3 in notify (subs=0x7ffd364bb200,
> watcher_subs=0x0, n_body=0x0, force_null_body=0) at notify.c:1690
>
> #24 0x00007fd9146cec6a in update_subscription (msg=0x7fd919efeb70,
> subs=0x7ffd364bb200, to_tag_gen=1, sent_reply=0x7ffd364bb16c) at
> subscribe.c:697
>
> #25 0x00007fd9146d45b7 in handle_subscribe (msg=0x7fd919efeb70,
> watcher_user=..., watcher_domain=...) at subscribe.c:1057
>
> #26 0x00007fd9146d08b0 in handle_subscribe0 (msg=0x7fd919efeb70) at
> subscribe.c:816
>
> #27 0x000000000041e155 in do_action (h=0x7ffd364bd680,
> a=0x7fd919e19508, msg=0x7fd919efeb70) at action.c:1053
>
> #28 0x000000000042a917 in run_actions (h=0x7ffd364bd680,
> a=0x7fd919e19508, msg=0x7fd919efeb70) at action.c:1548
>
> #29 0x000000000041e112 in do_action (h=0x7ffd364bd680,
> a=0x7fd919e19650, msg=0x7fd919efeb70) at action.c:1048
>
> #30 0x000000000042a917 in run_actions (h=0x7ffd364bd680,
> a=0x7fd919e02638, msg=0x7fd919efeb70) at action.c:1548
>
> #31 0x000000000041e0c4 in do_action (h=0x7ffd364bd680,
> a=0x7fd919e199c0, msg=0x7fd919efeb70) at action.c:1044
>
> #32 0x000000000042a917 in run_actions (h=0x7ffd364bd680,
> a=0x7fd919e199c0, msg=0x7fd919efeb70) at action.c:1548
>
> #33 0x000000000041e112 in do_action (h=0x7ffd364bd680,
> a=0x7fd919e19b08, msg=0x7fd919efeb70) at action.c:1048
>
> #34 0x000000000042a917 in run_actions (h=0x7ffd364bd680,
> a=0x7fd919df99d8, msg=0x7fd919efeb70) at action.c:1548
>
> #35 0x000000000041ab46 in do_action (h=0x7ffd364bd680,
> a=0x7fd919dbe960, msg=0x7fd919efeb70) at action.c:677
>
> #36 0x000000000042a917 in run_actions (h=0x7ffd364bd680,
> a=0x7fd919daedf8, msg=0x7fd919efeb70) at action.c:1548
>
> #37 0x000000000042b07d in run_top_route (a=0x7fd919daedf8,
> msg=0x7fd919efeb70, c=0x0) at action.c:1634
>
> #38 0x000000000050f678 in receive_msg (buf=0x7fd8f2c6ce28 "SUBSCRIBE
> sip:endpoint-1720 at intouchstaging.com SIP/2.0\r\nRecord-Route:
> <sip:64.64.203.109:443;transport=tls;lr=on>\r\nAccept:
> application/dialog-info+xml, application/pidf+xml,
> application/pidf-diff+xml,"..., len=1284, rcv_info=0x7fd8f2c6cb50) at
> receive.c:196
>
> #39 0x00000000005fb99e in receive_tcp_msg (tcpbuf=0x7fd8f2c6ce28
> "SUBSCRIBE sip:endpoint-1720 at intouchstaging.com
> SIP/2.0\r\nRecord-Route:
> <sip:64.64.203.109:443;transport=tls;lr=on>\r\nAccept:
> application/dialog-info+xml, application/pidf+xml,
> application/pidf-diff+xml,"..., len=1284, rcv_info=0x7fd8f2c6cb50,
> con=0x7fd8f2c6cb38) at tcp_read.c:1207
>
> #40 0x00000000005fd48c in tcp_read_req (con=0x7fd8f2c6cb38,
> bytes_read=0x7ffd364bdb7c, read_flags=0x7ffd364bdb84) at tcp_read.c:1411
>
> #41 0x0000000000600aee in handle_io (fm=0x7fd919f07d80, events=1,
> idx=-1) at tcp_read.c:1643
>
> #42 0x00000000005f3ab8 in io_wait_loop_epoll (h=0xa3d3e0 <io_w>, t=2,
> repeat=0) at io_wait.h:1061
>
> #43 0x0000000000601cf7 in tcp_receive_loop (unix_sock=57) at
> tcp_read.c:1755
>
> #44 0x00000000005ea235 in tcp_init_children () at tcp_main.c:4788
>
> #45 0x00000000004ab048 in main_loop () at main.c:1675
>
> #46 0x00000000004b10c2 in main (argc=13, argv=0x7ffd364be258) at
> main.c:2566
>
> ---------
>
>  
>
> Thanks very much.
>
>     -Cody
>
>
>
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-- 
Daniel-Constantin Mierla
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - www.asipto.com
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