[asterisk-bugs] [Asterisk 0019397]: Deadlock in queue handling

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=19397 
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Reported By:                byronclark
Assigned To:                
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Project:                    Asterisk
Issue ID:                   19397
Category:                   Applications/app_queue
Reproducibility:            random
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           1.8.4 
JIRA:                        
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:             2011-06-01 13:11 CDT
Last Modified:              2011-06-01 17:25 CDT
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Summary:                    Deadlock in queue handling
Description: 
Hit a deadlock on queue handling on a lightly loaded system. Output of
"core show locks" in the Additional Information section.

It looks like BETTER_BACKTRACES doesn't really work when the debug
information lives in a separate (installed) debuginfo package. Backtrace
attached to the ticket.

Here's a quick analysis (thread nubmers are gdb/core show locks):
Thread 20/1081149760
====================
Locks Held
----------
hints (pbx.c:4269)
hint (pbx.c:4270)

Blocking On
-----------
queues (app_queue.c:1563)


Thread 15/1088944448
====================
Locks Held
----------
dialogs (astobj2.c:657)
dialog [sip_pvt] (chan_sip.c:16147)

Blocking On
-----------
hints (pbx.c:4425)


Thread 11/1081657664
====================
Locks Held
----------

Blocking On
-----------
queues (app_queue.c:1463)


Thread 5/1102928192
===================
Locks Held
----------
queues (app_queue.c:4427)

Blocking On
-----------
dialogs (chan_sip.c:7358)


Thread 3/1109186880
===================
Locks Held
----------

Blocking On
-----------
queues (app_queue:2337)
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---------------------------------------------------------------------- 
 (0135631) byronclark (reporter) - 2011-06-01 17:25
 https://issues.asterisk.org/view.php?id=19397#c135631 
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irroot - That patch isn't really going to help here because, unfortunately,
this deadlock isn't caused by any of the paths that your patch attempts to
fix. 

Issue History 
Date Modified    Username       Field                    Change               
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2011-06-01 17:25 byronclark     Note Added: 0135631                          
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