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

[Asterisk Team (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-27617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Asterisk Team updated ASTERISK-27617:
-------------------------------------

    Assignee: Asterisk Team  (was: Colin)
      Status: Triage  (was: Waiting for Feedback)

> 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
>            Assignee: Asterisk Team
>              Labels: pjsip
>         Attachments: CoreDump-brief.txt, CoreDump-full.txt, CoreDump-thread1.txt, 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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