[asterisk-bugs] [Asterisk 0011080]: SIP channel stops processing calls, but no apparent deadlock

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=11080 
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Reported By:                callguy
Assigned To:                russell
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Project:                    Asterisk
Issue ID:                   11080
Category:                   Channels/chan_sip/General
Reproducibility:            always
Severity:                   block
Priority:                   normal
Status:                     assigned
Asterisk Version:           1.4.13  
SVN Branch (only for SVN checkouts, not tarball releases): N/A  
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             10-24-2007 15:58 CDT
Last Modified:              12-07-2007 17:45 CST
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Summary:                    SIP channel stops processing calls, but no apparent
deadlock
Description: 
Approximately once per week we are seeing asterisk stop processing SIP
calls. The behavior is the same as a deadlock, but core show locks does not
show any evidence that there is a deadlock. 

The only way to resolve is to restart asterisk. 

output of:
core show locks
info thread
thread apply all bt

from the running process is attached.
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Relationships       ID      Summary
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related to          0011165 Deadlock in channel.c
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---------------------------------------------------------------------- 
 sekil - 12-07-07 17:45  
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russel: I did the exact thing you explained. I'm getting now following
output from 'core show locks' (no * crashes any more):

=== Thread ID: 3084319632 (do_devstate_changes  started at [  378]
devicestate.c ast_device_state_engine_init())
=== ---> Tried and failed to get Lock http://bugs.digium.com/view.php?id=0
(channel.c): MUTEX 5007
ast_channel_trylock &chan->lock 0xb786b8a8 (16)

=== Thread ID: 3076918160 (do_monitor           started at [15571]
chan_sip.c restart_monitor())
=== ---> Tried and failed to get Lock http://bugs.digium.com/view.php?id=0
(channel.c): MUTEX 5007
ast_channel_trylock &chan->lock 0xb786b8a8 (3)

This is accumulating in time and leads to a * stop processing SIP calls.
Problems began when I installed two phone sidecars configured to "watch"
same extensions. I have turned off hints on one of them, but still getting
deadlocks almost hourly now. Problem is hard to reproduce on a slow traffic
day. 
B.t.w, I have 1.2 in production on other places with tens of SNOMs and
plenty of SUBSCRIBE/NOTIFYs and everything is working as a charm. 

Issue History 
Date Modified   Username       Field                    Change               
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12-07-07 17:45  sekil          Note Added: 0075079                          
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