[asterisk-bugs] [JIRA] (ASTERISK-27617) Frack (crash), excessive refcount during Jitterbuffer operation

[George Joseph (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=241771#comment-241771 ] 

George Joseph commented on ASTERISK-27617:
------------------------------------------

Thank you for the crash report. However, we need more information to investigate the crash. Please provide:

1. A backtrace generated from a core dump using the instructions provided on the Asterisk wiki [1].
2. Specific steps taken that lead to the crash.
3. All configuration information necesary to reproduce the crash.

Thanks!

[1]: https://wiki.asterisk.org/wiki/display/AST/Getting+a+Backtrace

Colin,

Can you get the full backtrace for us using these instructions?

Also is this something you can reproduce?


> Frack (crash), excessive refcount during Jitterbuffer operation
> ---------------------------------------------------------------
>
>                 Key: ASTERISK-27617
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27617
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Core/Jitterbuffer
>    Affects Versions: 14.6.0
>         Environment: Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-109-generic x86_64) 
>  
>            Reporter: Colin
>         Attachments: jitterbuffer frack.txt
>
>
> During an __ast_read operation on a pushed frame (in abstract_jb::hook_event_cb()), the reference count on the ast_frame_subclass resulted in a FRACK, and system crash. 
> The referenced field which triggered the failed assert was out->subclass.format - a reference to the Asterisk media format. Bumping this causes the EXCESSIVE_REF_COUNT to be exceeded.
> This instance of Asterisk was participating in a Stasis application, with around 28 callers. At the time of the crash around 20 were muted, but no bridge or channel operations were being carried out by the Stasis application.
> Core dump included as text file.



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