[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=195934#comment-195934 ] 

Mark Michelson commented on ASTERISK-20212:
-------------------------------------------

Thanks for the core show locks and backtrace. It looks like a call to fgets() in chan_sip.c is blocking forever while holding a lock. The solution here is to figure out why that function call would block since we should only be calling it when there is data to be read. Reproducing this is not going to be easy since things appear to happen at random, so I'm going to have to inspect the code for potential problems and see if I can find anything.

> 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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