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Index: sys/kern/kern_rmlock.c
===================================================================
--- sys/kern/kern_rmlock.c
+++ sys/kern/kern_rmlock.c
@@ -362,8 +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. */
- if (tracker->rmp_flags) {
+ /*
+ * 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.
+ */
+ if (atomic_load_int(&tracker->rmp_flags) != 0) {
/* Just add back tracker - we hold the lock. */
rm_tracker_add(pc, tracker);
critical_exit();

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