[asterisk-bugs] [JIRA] (ASTERISK-29201) Crash occurs when Transfer and execute Hangup before the Transfer result

[Dan Cropp (JIRA)]

Dan Cropp created ASTERISK-29201:
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             Summary: Crash occurs when Transfer and execute Hangup before the Transfer result 
                 Key: ASTERISK-29201
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29201
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_pjsip
    Affects Versions: 18.1.0, 17.9.0, 16.15.0
         Environment: Ubuntu 16 and 18
            Reporter: Dan Cropp


In the code I submitted for ASTERISK-26968 there is a bug which can cause a crash.  That code added support for a SUBSCRIPTION session which was not always being cleaned up.
We perform a transfer using AMI.  The transferred call is not answered and we don't receive a transfer result, we then issue a Hangup using AMI.  The call terminates, but does not cleanup the SUBSCRIPTION.  As a result, there is a leak.  What we found at two different sites is the SUBSCRIBE/NOTIFY happens roughly 10 minutes later and often (not 100%) crashes.
Regardless of the crash or not, the code is missing some conditions where it should cleanup the subscription.

We have a fix for this issue which I would like to submit.  I will need to refresh on the steps to make a submission.



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