[asterisk-bugs] [JIRA] (ASTERISK-29775) CPU spike

[Dan Cropp (JIRA)]

Dan Cropp created ASTERISK-29775:
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             Summary: CPU spike
                 Key: ASTERISK-29775
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29775
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Applications/app_confbridge, Channels/chan_local
    Affects Versions: 18.8.0, 16.22.0
         Environment: Ubuntu 18 and also Ubuntu 20
            Reporter: Dan Cropp
            Severity: Major


We use AMI to do the following.  I don't think it's AMI causing the issue, but mentioning it.

Create 2 ConfBridges (A and B)
Create a Local channel 1234.  
Add one end of the local channel 1234;1 to ConfBridge A.
Add the other end of local channel 1234;2 to ConfBridge B.
Create another Local channel 5678.
Add one end of local channel 5678;2 to ConfBridge B.
Now on local channel 5678;1, we execute a Record.

The CPU spikes at this point.  I suspect the code is in some loop with processing the multiple calls with the ConfBridge.
Even when the Record completes, the CPU is still running 95+%.  The top PIDs are all asterisk running CPU% 95-96%, others four are 10-20%.
Basically, the box becomes so bogged down it runs into problems and can't process other things.

Even if I remove local channel 5678;2 from ConfBridge B, the CPU stays running at peak.

Once either ConfBridge has the calls kicked or either end of the local channel 1234 is removed from either ConfBridge, the CPU issue is resolved.

While local channels like this doesn't make sense.  We originally found this because we had PJSIP calls in different ConfBridges but needed the ConfBridges to be connected with a local channel.  All was fine until a customer started requiring us to have separate recording for each participant in one of the bridge.  That's when we started adding local channels as each participant joined and began recording.

By eliminating the PJSIP calls in the sample, it eliminates areas to look at.



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