[asterisk-bugs] [JIRA] (ASTERISK-27058) Deadlock in ICE / SRTP

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=237457#comment-237457 ] 

Asterisk Team commented on ASTERISK-27058:
------------------------------------------

Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution.

A good first step is for you to review the [Asterisk Issue Guidelines|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Issue+Guidelines] if you haven't already. The guidelines detail what is expected from an Asterisk issue report.

Then, if you are submitting a patch, please review the [Patch Contribution Process|https://wiki.asterisk.org/wiki/display/AST/Patch+Contribution+Process].

> Deadlock in ICE / SRTP
> ----------------------
>
>                 Key: ASTERISK-27058
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27058
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_rtp_asterisk
>    Affects Versions: 13.17.0, 14.5.0
>         Environment: N/A
>            Reporter: Michael Walton
>
> Occasionally, when using chan_sip (and possibly PJSIP) with WebRTC ICE/SRTP and a TURN service, the Asterisk instance will encounter deadlock between the PJNATH timer_worker_thread and ioqueue_worker_thread. 
> I have a "special" version of Asterisk 11 where I've ported PJProject 2.6 because of its many deadlock issues, and found this deadlock still exists. I believe it is also as a result present in Asterisk 13 and 14. 
> The problem comes down to the classic potentially unordered use of multiple locks, for which the "group lock" was introduced in PJ (https://trac.pjsip.org/repos/ticket/1617). Unfortunately, this group lock has not been used consistently from res_rtp_asterisk. In particular, when pj_turn_sock_create() is called, it is passed a NULL instead of the existing group lock for the ICE session, causing PJ to allocate a new lock for TURN. And the potential for deadlock.



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