[asterisk-bugs] [JIRA] (ASTERISK-25435) Asterisk periodically hangs. UDP Recv-Q greatly exceeds zero.

[Mark Michelson (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-25435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=227751#comment-227751 ] 

Mark Michelson commented on ASTERISK-25435:
-------------------------------------------

It looks like the problem is that the send_request_wrapper structure in res_pjsip.c has its mutex created using pj_mutex_create_simple(). The lock is then attempted to be locked recursively (see thread 14 of 2015_09_29__21_43_01.backtrace-threads.txt), which results in the thread blocking forever. There are two potential solutions here:

1) Declare the lock using pj_mutex_create_recursive() so that this will not cause a deadlock
2) Use an ast_mutex_t, which is always created recursive. This also would allow for the lock to show up in 'core show locks' output.

> Asterisk periodically hangs. UDP Recv-Q greatly exceeds zero.
> -------------------------------------------------------------
>
>                 Key: ASTERISK-25435
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25435
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>    Affects Versions: 13.5.0
>            Reporter: Dmitriy Serov
>            Assignee: Mark Michelson
>         Attachments: 2015_09_29__21_42_01.full.tail.txt, 2015_09_29__21_42_01.netstat.txt, 2015_09_29__21_43_01.backtrace-threads.txt, 2015_09_29__21_43_01.full.tail.txt, 2015_09_29__21_43_01.locks.txt, 2015_09_29__21_43_01.netstat.txt, 2015_09_29__21_44_07.backtrace-threads.txt, 2015_09_29__21_44_07.full.tail.txt
>
>
> Asterisk periodic hangs. 
> UDP Recv-Q greatly exceeds zero.
> No errors in log (like DNS error, function getaddr).
> The system behavior is very similar to ASTERISK-25421.
> STUN is Off
> Backtraces attached.



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