Witold Kręcicki e4d39f57ff
Fix a race in isc_socket destruction. ...
There was a very slim chance of a race between isc_socket_detach and
process_fd: isc_socket_detach decrements references to 0, and before it
calls destroy gets preempted. Second thread calls process_fd, increments
socket references temporarily to 1, and then gets preempted, first thread
then hits assertion in destroy() as the reference counter is now 1 and
not 0.
(cherry picked from commit 81ba0fe0e6
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