[asterisk-bugs] [JIRA] Commented: (ASTERISK-20212) Deadlock / TCP SIP Stack

[Mark Michelson (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-20212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=195940#comment-195940 ] 

Mark Michelson commented on ASTERISK-20212:
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One thing that seems a bit odd to me is that there are apparently two threads polling the same same tcptls_session. One is a client thread and the other is the server thread. As far as I'm aware, such a situation is not supposed to happen. I suspect that what has occurred here is that somehow, both threads were polling on the same file descriptors. When this occurs, it likely can lead to some weird things happening like what you are seeing. I will try to find what could cause this situation to occur and look into trying to prevent it from occurring.

> Deadlock / TCP SIP Stack
> ------------------------
>
>                 Key: ASTERISK-20212
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20212
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/TCP-TLS
>    Affects Versions: 10.7.0
>         Environment: CentOS 5.7 / Asterisk 10.7.0
>            Reporter: Phil Ciccone
>         Attachments: backtrace-threads.txt, core-show-locks.txt
>
>
> We have been experiencing Asterisk deadlocks for the past week, from at the time, what seemed like nowhere. We upgraded to the latest 10.7.0 stable and enabled the debug flag and disabled optimizations in hopes to catch the deadlock. It seems from looking at the locks we have some sort of problem with our TCP connected SIP devices. Things are now starting to make sense as connecting TCP SIP devices is something newer that we started to do. The deadlocks we experience happen anywhere from every-other-day to several times a day, all involving a restart. Would you be so kind as to look at the attached backtrace and locks output?

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