[asterisk-bugs] [JIRA] (ASTERISK-26197) chan_sip: Deadlock during hangup

[Joshua Colp (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-26197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=231411#comment-231411 ] 

Joshua Colp commented on ASTERISK-26197:
----------------------------------------

This appears to be a locking inversion between "sip show channels" and other operations. The repeated AMI executions of it just increases the chance greatly of it happening.

> chan_sip: Deadlock during hangup
> --------------------------------
>
>                 Key: ASTERISK-26197
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26197
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/General
>    Affects Versions: 11.22.0
>         Environment: CentOS release 6.7 (Final) x64
>            Reporter: Dmitrii kondrashin
>         Attachments: backtrace.txt, core-show-fd.txt, core-show-locks.txt, core-show-taskprocessors.txt, core-show-threads.txt
>
>
> Periodically, the asterisk stop to handle call(SIP messages) correctly. Сorrect handling is restored only after restarting asterisk.
> It seems that the lock is created while asterisk tries to read from the tls socket, after that the thread crushes without release  of lock, and  all other threads are waiting for the release of this lock.
> Asterisk was compiled without srtp module and tls is disabled in asterisk's configs. 
> I've attached  the output of commands "core show locks", "core show taskprocessors", "core show threads", "core show fd", and backtrace-file prepared using gdb. 
> Build Options: DONT_OPTIMIZE, DEBUG_THREADS, LOADABLE_MODULES, DEBUG_FD_LEAKS



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