[asterisk-bugs] [JIRA] (ASTERISK-27094) res_fax: Deadlock when using Local channels and fax gateway

[Richard Mudgett (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=239018#comment-239018 ] 

Richard Mudgett commented on ASTERISK-27094:
--------------------------------------------

This deadlock is in the bridging core and is not channel driver specific.

The newer backtrace and core_show_locks files still don't have a lot of source file debug information.  The core_show_locks file does point out the two threads that are deadlocked.  The {{Thread ID: 0x7fceb6fe8700 LWP:16926}} and {{Thread ID: 0x7fce703cb700 LWP:16930}} threads are deadlocked.  There is a BETTER_BACKTRACES menuselect option that would actually make the core_show_locks backtraces very helpful and should absolutely confirm that it is the first ast_indicate() in the bridge_channel_internal_join() I mentioned back in July.  However, I'm quite certain that it is the first ast_indicate() that is causing the deadlock.


> res_fax: Deadlock when using Local channels and fax gateway
> -----------------------------------------------------------
>
>                 Key: ASTERISK-27094
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27094
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_fax
>    Affects Versions: 13.15.1, 13.17.0
>            Reporter: David Brillert
>         Attachments: coreshowlocks.txt, gdbthreadapplyallbtfull(1).txt, gdbthreadapplyallbt.txt
>
>
> All calling via SIP PSTN carrier.
> progressinband = yes
> directmedia =  yes
> prematuremedia  =  no
> Incoming call A is answered with progress
> Then bridged with progress to external call B
> Call is processed with audio OK
> But no further SIP processing in console and all SIP further signalling dies including OPTIONS packets.



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