[asterisk-bugs] [JIRA] (ASTERISK-21207) [patch] - Deadlock on fax extension calling ast_async_goto() with locked channel

[Andrew Nowrot (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-21207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=205308#comment-205308 ] 

Andrew Nowrot commented on ASTERISK-21207:
------------------------------------------

I am not sure this is related, but my asterisk got deadlock today. I was able to catch "core show locks" and backtrace-threads, I was also logging debug messages (with verbose level 8) and I can see that the last thing it did was related to fax T38. 
It all had happened after applying the lates fax-deadlock-v2-patch-11.3.30.
                
> [patch] - Deadlock on fax extension calling ast_async_goto() with locked channel
> --------------------------------------------------------------------------------
>
>                 Key: ASTERISK-21207
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21207
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_dahdi, Channels/chan_sip/General
>    Affects Versions: 10.7.1, 11.2.1
>         Environment: CentOS 6.3 x86_64
>            Reporter: Ashley Winters
>            Severity: Critical
>         Attachments: backtrace-threads.txt, core-show-locks.txt, fax-deadlock.patch, fax-deadlock-v2.patch, fax-deadlock-v2.patch-11.3.0, gdb-fax-deadlock.txt, issue_log
>
>
> On an asterisk system with heavy use of AGI and inbound CNG-detected faxing, occasionally all channel activity will freeze. Running 'core show channels' returns nothing, but the logs continue running with anything except channel activity. Running with 'sip set debug on' shows that chan_sip.c doesn't even claim to be reading packets anymore.
> This deadlock was triggered several times daily across our array of asterisk servers, which process hundreds of faxes and tens of thousands of calls daily.

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