[asterisk-bugs] [JIRA] (ASTERISK-28560) do_monitor Thread hangs on 99% cpu and doesn't respond

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-28560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=248199#comment-248199 ] 

Asterisk Team commented on ASTERISK-28560:
------------------------------------------

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].

Please note that once your issue enters an open state it has been accepted. As Asterisk is an open source project there is no guarantee or timeframe on when your issue will be looked into. If you need expedient resolution you will need to find and pay a suitable developer. Asking for an update on your issue will not yield any progress on it and will not result in a response. All updates are posted to the issue when they occur.

> do_monitor Thread hangs on 99% cpu and doesn't respond
> ------------------------------------------------------
>
>                 Key: ASTERISK-28560
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28560
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/Registration
>    Affects Versions: 13.29.0
>         Environment: CentOS 7.5, 2 Cores, 16GB RAM, Gigabit ethernet, XCP hosted VM
>            Reporter: Eike Maier
>
> We have a small Asterisk PBX with about 50 to 70 extensions, 5 simult. calls and are using the queue app. 
> We're using some realtime functions like dynamic realtime for queue, queue member, queue log, moh and voicemail.
> Most of the other config files are used via static realtime. 
> When we're having some calls on our PBX and there are registers at the same time, sometimes the do_monitor thread of asterisk hangs on 99% CPU and doesn't respond to any input. The chan_sip module isn't doing anything after that. Most of the time, only a restart is solving this state.
> This state happens at least 2 times a day and is a bit annoying to reproduce.
> We're using a small modification, to ensure the sippeer table is updated, like via dynamic realtime, but this happens even without the modification.
> I have the output of core show locks and core show threads, a gdb trace could be done the next time, this happens.



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