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

[Masahide Yamamoto (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-21207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=220283#comment-220283 ] 

Masahide Yamamoto edited comment on ASTERISK-21207 at 7/6/14 10:03 AM:
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Probably the same approach can be taken in functions like ast_async_goto which calls ast_channel_alloc, ast_do_masquerade, etc, in which threads cannot hold any channel locks. 


was (Author: m.yamamoto):
Probably the same approach can be taken in something like ast_async_goto which calls ast_do_masquerade or ast_do_masquerade itself.

> [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: backtrace-threads.txt, core-show-locks.txt, fax-deadlock.patch, fax-deadlock-v2.patch, fax-deadlock-v2.patch-11.3.0, gdb-fax-deadlock.txt, issue_log
>
>
> 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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