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

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=11165 
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Reported By:                callguy
Assigned To:                
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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:              
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Date Submitted:             11-05-2007 14:18 CST
Last Modified:              11-08-2007 23:13 CST
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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.
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---------------------------------------------------------------------- 
 enst - 11-08-07 23:13  
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I met a dead lock much like this.

chan_sip.c 
sipsock_read{
...
p = find_call(&req, &sin, req.method);	/* returns p locked */
...
handle_request
     |----__sip_ack(p, seqno, FLAG_RESPONSE, 0);
}

same p, same p->lock

http://bugs.digium.com/view.php?id=0  0x00002afa4c968bd8 in
__lll_mutex_lock_wait () from
/lib/libpthread.so.0
http://bugs.digium.com/view.php?id=1  0x00002afa4c964ac8 in _L_mutex_lock_106 ()
from /lib/libpthread.so.0
http://bugs.digium.com/view.php?id=2  0x00002afa4c964423 in pthread_mutex_lock
() from /lib/libpthread.so.0
http://bugs.digium.com/view.php?id=3  0x00002aaabc7c1f22 in
__ast_pthread_mutex_lock
(filename=0x2aaabc815c13 "chan_sip.c", lineno=2133, func=0x2aaabc816a0f
"__sip_ack", 
    mutex_name=0x2aaabc816a19 "&p->lock", t=0x2aaad804bc60) at
/usr/src/asterisk/include/asterisk/lock.h:308
http://bugs.digium.com/view.php?id=4  0x00002aaabc7c3139 in __sip_ack
(p=0x2aaad804bc60, seqno=102, resp=1,
sipmethod=0) at chan_sip.c:2133
http://bugs.digium.com/view.php?id=5  0x00002aaabc807af1 in handle_request
(p=0x2aaad804bc60,
req=0x40255b10, sin=0x40256f40, recount=0x40255afc, nounlock=0x40255b00)
    at chan_sip.c:15069
http://bugs.digium.com/view.php?id=6  0x00002aaabc8083ac in sipsock_read
(id=0x81aef0, fd=12, events=1,
ignore=0x0) at chan_sip.c:15181
http://bugs.digium.com/view.php?id=7  0x000000000047ae2a in ast_io_wait
(ioc=0x818ab0, howlong=1) at
io.c:279
http://bugs.digium.com/view.php?id=8  0x00002aaabc808e13 in do_monitor
(data=0x0) at chan_sip.c:15384
http://bugs.digium.com/view.php?id=9  0x00000000004deaae in dummy_start
(data=0x822bb0) at utils.c:806
http://bugs.digium.com/view.php?id=10 0x00002afa4c9622a5 in start_thread () from
/lib/libpthread.so.0
http://bugs.digium.com/view.php?id=11 0x00002afa4d33a61d in clone () from
/lib/libc.so.6
http://bugs.digium.com/view.php?id=12 0x0000000000000000 in ?? () 

Issue History 
Date Modified   Username       Field                    Change               
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11-08-07 23:13  enst           Note Added: 0073426                          
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