[asterisk-dev] [Code Review] 3431: Fix channel staging assertion failure.

[rmudgett]

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https://reviewboard.asterisk.org/r/3431/
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Review request for Asterisk Developers.


Repository: Asterisk


Description
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The failing assertion ensures that the final snapshot gets generated so CDR records can get finalized.  The only place where a channel staging snapshot flag could be left set is in the handle_request_bye().  The function could return before clearing the flag because the channel could dissappear while the function had to have the channel unlocked.

* Fixed handle_request_bye() channel snapshot staging coverage area to not have a return in the middle of it and be unable to clear the staging flag.

* Pushed the channel snapshot staging coverage area into ast_rtp_instance_set_stats_vars() to ensure that the staging is not interrutped.

* Made callers of ast_rtp_instance_set_stats_vars() not call it with channels or channel driver private locks held to eliminate the deadlock potential.  The callers must hold references to the passed in channel and rtp objects.

* Eliminated sip_hangup() trying to get the bridge peer.  It is futile at this point because the channel could never be in a bridge.

* Moved sip_pvt unref in ast_hangup() and handle_request_do() to the end of the function.  The unref needs to happen after the last use of the pointer.


Diffs
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  /branches/12/main/rtp_engine.c 412047 
  /branches/12/channels/chan_sip.c 412047 

Diff: https://reviewboard.asterisk.org/r/3431/diff/


Testing
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I was unsuccessful in reproducing the testsuite channel staging assertion failure.
However, SIP calls can still setup and teardown with the patch installed.


Thanks,

rmudgett

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