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

[Ashley Winters (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-21207?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashley Winters updated ASTERISK-21207:
--------------------------------------

    Attachment: fax-deadlock.patch

Fix for all obvious locations (chan_sip.c and chan_dahdi.c) where ast_async_goto(chan, ...) is called with chan locked.
                
> 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: fax-deadlock.patch, gdb-fax-deadlock.txt
>
>
> 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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