K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2015-09-15T22:16:21.033444Z
K 7
svn:log
V 644
Threads holding a read lock of a sleepable rm lock are not permitted
to sleep.  The rmlock implementation enforces this by disabling
sleeping when a read lock is acquired. To simplify the implementation,
sleeping is disabled for most of the duration of rm_rlock.  However,
it doesn't need to be disabled until the lock is acquired.  If a
sleepable rm lock is contested, then rm_rlock may need to acquire the
backing sx lock.  This tripped the overly-broad assertion.  Fix by
relaxing the assertion around the call to sx_xlock().

Reported by:	mjg
Reviewed by:	kib, mjg
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D3324

END