[asterisk-bugs] [Asterisk 0011730]: Multiple deadlock / show channels freeze on Queues 1.4.16/17

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
====================================================================== 
http://bugs.digium.com/view.php?id=11730 
====================================================================== 
Reported By:                UDI-Doug
Assigned To:                putnopvut
====================================================================== 
Project:                    Asterisk
Issue ID:                   11730
Category:                   Channels/chan_agent
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     assigned
Asterisk Version:           1.4.17 
SVN Branch (only for SVN checkouts, not tarball releases): N/A  
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
====================================================================== 
Date Submitted:             01-10-2008 08:51 CST
Last Modified:              01-10-2008 09:35 CST
====================================================================== 
Summary:                    Multiple deadlock / show channels freeze on Queues
1.4.16/17
Description: 
Hi all

I have a deadlock bug on queues that will happen 2-3 times daily, where
there will be a call the gets stuck in the queue and will not hangup untill
restart of Asterisk. When this occurs if we use the "show channels" command
the CLI will freeze but we are able to logout and back in to get the CLI
running again. If left to long there will be problems with Agent state
reporting and some agents will not recive calls unless they log out and in
again (where their state is reset) or we reload the queue app. We cannot
see the ZAP channel due to the "show channels" freezing CLI and the same
will happen using tab with "soft hangup". I am able to see the ZAP channel
in the queue and have tried "core destroy channel" with no success, this
will kill the ZAP channel but leave the Queued call. The only way that we
can clear the lock is a full restart of Asterisk. Below please find the CLI
outputs and attached the Thread Debug info on the lock. 
====================================================================== 

---------------------------------------------------------------------- 
 callguy - 01-10-08 09:35  
---------------------------------------------------------------------- 
putnopvut: if you look at the core show locks output from 11712 at least
part of it looks similar to what we are seeing there. i can't confirm that
the same use case is triggering it but thought it was worth noting. 

Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
01-10-08 09:35  callguy        Note Added: 0076652                          
======================================================================