K 10
svn:author
V 2
kp
K 8
svn:date
V 27
2017-03-22T21:18:18.183782Z
K 7
svn:log
V 433
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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