[asterisk-dev] [Code Review] Fix some issues in the provisional response keepalive code.

[Russell Bryant]

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https://reviewboard.asterisk.org/r/1648/
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Review request for Asterisk Developers.


Summary
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1) Fix a sip_pvt reference leak.  If the scheduler callback returned 0, it did not release the reference to the associated sip_pvt.
    
2) Add locking in the scheduler callback.  This code runs from the scheduler, which is executed in the SIP monitor thread.  A channel thread will be working with the sip_pvt at the same time.  Use sip_pvt_lock_full to ensure that the ast_channel/sip_pvt locking order is honored.


This addresses bug ASTERISK-18979.
    https://issues.asterisk.org/jira/browse/ASTERISK-18979


Diffs
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  /branches/1.8/channels/chan_sip.c 349408 

Diff: https://reviewboard.asterisk.org/r/1648/diff


Testing
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Currently running under heavy load on the reporter's production system.


Thanks,

Russell

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