[asterisk-bugs] [Asterisk 0016677]: [patch] deadlock in app_queue with use_weight during reload

[Asterisk Bug Tracker]

The following issue has been UPDATED. 
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https://issues.asterisk.org/view.php?id=16677 
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Reported By:                tim_ringenbach
Assigned To:                
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Project:                    Asterisk
Issue ID:                   16677
Category:                   Applications/app_queue
Reproducibility:            random
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           1.4.29 
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:             2010-01-22 17:47 CST
Last Modified:              2010-01-22 17:48 CST
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Summary:                    [patch] deadlock in app_queue with use_weight during
reload
Description: 
There's a deadlock possible in app_queue if the use_weight global variable
is set, and someone reloads app_queue at the right point in time while a
call is coming in. The call's thread locks the queue list lock, but doesn't
unlock it, resulting in a dead lock when other threads try to do anything
with the queue list.

To reproduce easily, add a sleep() between the first if (use_weight) and
grabbing the lock.

I'll attach a patch that fixes the problem by using a local variable to
store a copy of use_weight.
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Issue History 
Date Modified    Username       Field                    Change               
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2010-01-22 17:48 tim_ringenbach Summary                  deadlock in app_queue
with use_weight during reload => [patch] deadlock in app_queue with use_weight
during reload
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