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

[Colin (JIRA)]

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

Colin updated ASTERISK-27617:
-----------------------------

    Description: 
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.

  was:
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.




> 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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