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

[Eike Maier (JIRA)]

Eike Maier created ASTERISK-28560:
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             Summary: 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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