[asterisk-bugs] [Asterisk 0018441]: [patch] Deadlock in chan_sip

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=18441 
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Reported By:                Alric
Assigned To:                jpeeler
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Project:                    Asterisk
Issue ID:                   18441
Category:                   Core/General
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     assigned
Asterisk Version:           SVN 
JIRA:                       SWP-2737 
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): 1.8 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2010-12-08 17:10 CST
Last Modified:              2011-01-28 11:51 CST
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Summary:                    [patch] Deadlock in chan_sip
Description: 
I've been testing T.38 with my SIP provider using a Linksys ATA and a fax
machine behind it.

I initiate the fax with my fax machine and it connects with the other end.
 Shortly after the fax machine thinks the call disconnects.  If I type a
'core show channels' at this point, I don't see any active channels.  At
this point the PBX does not accept any more calls.  Commands also seem to
not go through on the CLI until I 'exit' and 'asterisk -vvvvvr' again.

Asterisk is compiled with DONT_OPTIMIZE and DEBUG_THREADS.  I have run
this scenario 3 to 5 times now with the same result so I am faithful I can
reproduce it as needed.

Attached is the output from 'core show locks' after the presumed deadlock.
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Relationships       ID      Summary
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related to          0018403 [patch] Deadlock on SIP blind transfer ...
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 (0131184) jpeeler (administrator) - 2011-01-28 11:51
 https://issues.asterisk.org/view.php?id=18441#c131184 
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The patch I uploaded should resolve the deadlock shown in the "Another core
show locks" file. The other two deadlocks (which are the same) I believe
was already fixed in https://issues.asterisk.org/view.php?id=18403 and has not
yet made it in a release.
viniciusfontes please test the patch, and the others please test the head
of the branch. 

Issue History 
Date Modified    Username       Field                    Change               
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2011-01-28 11:51 jpeeler        Note Added: 0131184                          
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