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

[Chris Cappuccio (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-21207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=204511#comment-204511 ] 

Chris Cappuccio edited comment on ASTERISK-21207 at 3/24/13 8:36 PM:
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I upgraded from 1.8.8.1. Tried 10.12.1 first, then 11.3.0rc1. Just wanted to let Digium and the submitters know, with either new version, I now seem to be running into the same deadlock. I have one server with 600 endpoints registering, proxying SIP calls with T.38 and RTP, and also using ReceiveFAX (SpanDSP) with T.38. With this patch, I haven't seen the deadlock after 4 days, where I was getting it almost every day. I will post an update after a week.
                
      was (Author: chriscappuccio):
    I upgraded from 1.8.8.1 after a while. Tried 10.12.1 first, then 11.3.0rc1. Just wanted to let Digium and the submitters know, with either new version, I now seem to be running into the same deadlock. I have one server with 600 endpoints registering, proxying SIP calls with T.38 and RTP, and also using ReceiveFAX (SpanDSP) with T.38. With this patch, I haven't seen the deadlock after 4 days, where I was getting it almost every day. I will post an update after a week.
                  
> [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: fax-deadlock.patch, gdb-fax-deadlock.txt, t38-fax-deadlock.patch
>
>
> 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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