[asterisk-bugs] [JIRA] (ASTERISK-21239) [patch] - Deadlock on fax extension calling ast_async_goto() with locked channel

[Matt Jordan (JIRA)]

Matt Jordan created ASTERISK-21239:
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             Summary: [patch] - Deadlock on fax extension calling ast_async_goto() with locked channel
                 Key: ASTERISK-21239
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21239
             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


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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