[OpenSIPS-Devel] [opensips] abandoned turn causes processes to sleep forever when handling retransmitted publishes (#754)

[Will Mitchell]

>  It continues processing, but it never calls next_turn_phtable before exiting. 

It technically *does* call next_turn_phtable, but on a *new* presentity in the phtable.  It does not increment the current_turn on the same presentity that it updated last_turn on.  This causes a mismatch on that presentity going forward.

> This will cause the process to lockup forever, waiting for its turn, on the next publish received.

Specifically, both of the processes in this scenario will continue on their way.  The *next* publish to the original presentity will lock, because current_turn is less than last_turn, and nothing exists to increment it.

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https://github.com/OpenSIPS/opensips/issues/754#issuecomment-171401097
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