[asterisk-bugs] [JIRA] (ASTERISK-25023) Deadlock in chan_sip in update_provisional_keepalive

[Rusty Newton (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-25023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=226078#comment-226078 ] 

Rusty Newton commented on ASTERISK-25023:
-----------------------------------------

I know it is probably hard for you to get a new trace with DEBUG_THREADS, but can you recompile with DONT_OPTIMIZE and BETTER_BACKTRACES? 

> Deadlock in chan_sip in update_provisional_keepalive
> ----------------------------------------------------
>
>                 Key: ASTERISK-25023
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25023
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/General
>    Affects Versions: 13.3.2
>         Environment: centos 6 / 64Bit
>            Reporter: Arnd Schmitter
>         Attachments: trace.txt
>
>
> There is a race condition / deadlock when update_provisional_keepalive is called.
> If there is already a scheduler run plant for calling send_provisional_keepalive_full.
> the func update_provisional_keepalive gets called with a locked sip_pvt struct and the first thing it does is delete the plant scheduler.
> If the plant scheduler is started after the sip_pvt lock and before the AST_SCHED_DEL_UNREF call in update_provisional_keepalive is executed, the scheduler job is blocked in send_provisional_keepalive_full, waiting to get a lock on the sip_pvt struct.
> The call to AST_SCHED_DEL_UNREF is waiting for a condistion signal, that the running scheduler finish.



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