D28821.id84355.diff
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	Index: sys/kern/kern_rmlock.c
	===================================================================
	--- sys/kern/kern_rmlock.c
	+++ sys/kern/kern_rmlock.c
	@@ -362,7 +362,11 @@
	/* Remove our tracker from the per-cpu list. */
	rm_tracker_remove(pc, tracker);

	- /* Check to see if the IPI granted us the lock after all. */
	+ /*
	+ * Check to see if the IPI granted us the lock after all. The load of
	+ * rmp_flags must happen after the tracker is removed from the list.
	+ */
	+ __compiler_membar();
	if (tracker->rmp_flags) {
	/* Just add back tracker - we hold the lock. */
	rm_tracker_add(pc, tracker);