[asterisk-bugs] [Asterisk 0016847]: [patch] Deadlock between dahdi_exception and dahdi_indicate

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=16847 
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Reported By:                shin-shoryuken
Assigned To:                
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Project:                    Asterisk
Issue ID:                   16847
Category:                   Channels/chan_dahdi
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     ready for testing
Asterisk Version:           1.6.1.14 
JIRA:                       SWP-927 
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2010-02-16 15:16 CST
Last Modified:              2010-06-24 04:50 CDT
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Summary:                    [patch] Deadlock between dahdi_exception and
dahdi_indicate
Description: 
I've encountered a deadlock situation between dahdi_exception and
dahdi_indicate, running Asterisk 1.6.1.6 (confirmed as well in 1.6.1.14) on
Debian Lenny x86_64.  Deadlock occurs roughly once a week, usually under
lower call volume (strangely enough).  The issue seems to arise mostly when
swapping between call-waiting lines on a DAHDI channel.
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---------------------------------------------------------------------- 
 (0123815) alecdavis (manager) - 2010-06-24 04:50
 https://issues.asterisk.org/view.php?id=16847#c123815 
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callwaiting_deadlock.txt uploaded
Summary:
=== Thread ID: -1223439472 (do_devstate_changes  started at [  723]
devicestate.c ast_device_state_engine_init())
=== ---> Lock https://issues.asterisk.org/view.php?id=0 (astobj2.c): MUTEX 657
internal_ao2_callback c 0x84ae300
(1)

=== ---> Waiting for Lock https://issues.asterisk.org/view.php?id=1 (channel.c):
MUTEX 1389 ast_channel_cmp_cb
chan 0x8684c20 (1)
=== --- ---> Locked Here: channel.c line 3280 (__ast_read)

=== -------------------------------------------------------------------
===
=== Thread ID: -1347757168 (do_monitor           started at [11266]
chan_dahdi.c restart_monitor())
=== ---> Lock https://issues.asterisk.org/view.php?id=0 (chan_dahdi.c): MUTEX
10997 do_monitor &iflock 0xb6e5c060
(1)

=== ---> Waiting for Lock https://issues.asterisk.org/view.php?id=1
(chan_dahdi.c): MUTEX 11015 do_monitor
&i->lock 0xaffbf5e8 (1)
=== --- ---> Locked Here: chan_dahdi.c line 8340 (dahdi_exception)

=== -------------------------------------------------------------------
===
=== Thread ID: -1348744304 (pbx_thread           started at [ 4963] pbx.c
ast_pbx_start())
=== ---> Lock https://issues.asterisk.org/view.php?id=0 (channel.c): MUTEX 3280
__ast_read chan 0x8684c20 (1)
=== ---> Lock https://issues.asterisk.org/view.php?id=1 (chan_dahdi.c): MUTEX
8340 dahdi_exception &p->lock
0xaffbf5e8 (1)
=== ---> Waiting for Lock https://issues.asterisk.org/view.php?id=2 (channel.c):
MUTEX 1138 __ast_queue_frame
chan 0x8676508 (1)
=== --- ---> Locked Here: channel.c line 3810 (ast_indicate_data)

=== -------------------------------------------------------------------
===
=== Thread ID: -1348494448 (pbx_thread           started at [ 4963] pbx.c
ast_pbx_start())
=== ---> Lock https://issues.asterisk.org/view.php?id=0 (channel.c): MUTEX 3810
ast_indicate_data chan 0x8676508
(1)
=== ---> Waiting for Lock https://issues.asterisk.org/view.php?id=1
(chan_dahdi.c): MUTEX 8802 dahdi_indicate
&p->lock 0xaffbf5e8 (1)
=== --- ---> Locked Here: chan_dahdi.c line 8340 (dahdi_exception)
=== -------------------------------------------------------------------
===
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asterix*CLI> 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2010-06-24 04:50 alecdavis      Note Added: 0123815                          
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