Kristof Provost
2f8fb3a868
pf: Fix possible shutdown race ...
Prevent possible races in the pf_unload() / pf_purge_thread() shutdown
code. Lock the pf_purge_thread() with the new pf_end_lock to prevent
these races.
Use a shared/exclusive lock, as we need to also acquire another sx lock
(VNET_LIST_RLOCK). It's fine for both pf_purge_thread() and pf_unload()
to sleep,
Pointed out by: eri, glebius, jhb
Differential Revision: https://reviews.freebsd.org/D10026
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2f8fb3a868