[asterisk-bugs] [Asterisk 0011165]: Deadlock in channel.c

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
====================================================================== 
http://bugs.digium.com/view.php?id=11165 
====================================================================== 
Reported By:                callguy
Assigned To:                
====================================================================== 
Project:                    Asterisk
Issue ID:                   11165
Category:                   Channels/General
Reproducibility:            random
Severity:                   block
Priority:                   normal
Status:                     feedback
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:              
====================================================================== 
Date Submitted:             11-05-2007 14:18 CST
Last Modified:              11-13-2007 23:51 CST
====================================================================== 
Summary:                    Deadlock in channel.c
Description: 
We had what appears to be a new deadlock in channel.c today. output of core
show locks attached.
====================================================================== 

---------------------------------------------------------------------- 
 enst - 11-13-07 23:51  
---------------------------------------------------------------------- 
dklima: when I find the dead lock
 core show locks     
=== Thread ID: 1102494016 (pbx_thread           started at [ 2627] pbx.c
ast_pbx_start())
=== ---> Waiting for Lock http://bugs.digium.com/view.php?id=0 (channel.c):
MUTEX 5009 ast_channel_lock
&chan->lock 0x2aaad804dab8 (1)

=== Thread ID: 1076197696 (do_monitor           started at [15443]
chan_sip.c restart_monitor())
=== ---> Lock http://bugs.digium.com/view.php?id=0 (chan_sip.c): MUTEX 15144
sipsock_read &netlock
0x2aaabca29580 (1)
=== ---> Lock http://bugs.digium.com/view.php?id=1 (chan_sip.c): MUTEX 4526
find_call &p->lock
0x2aaad804bc60 (2)
=== ---> Lock http://bugs.digium.com/view.php?id=2 (channel.c): MUTEX 5041
ast_channel_trylock &chan->lock
0x2aaad804dab8 (1)

then use 'gdb asterisk pidnum'    debug the thread 1076197696 , 
3 0x00002aaabc7c1f22 in __ast_pthread_mutex_lock (filename=0x2aaabc815c13
"chan_sip.c", lineno=2133, func=0x2aaabc816a0f "__sip_ack",
I find in func __sip_ack try to lock the same lock which is locked by
find_call 0x2aaad804bc60 

Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
11-13-07 23:51  enst           Note Added: 0073625                          
======================================================================