Index: head/sys/kern/kern_rmlock.c
===================================================================
--- head/sys/kern/kern_rmlock.c
+++ head/sys/kern/kern_rmlock.c
@@ -652,8 +652,8 @@
 		KASSERT(!rm_wowned(rm),
 		    ("rm_rlock: wlock already held for %s @ %s:%d",
 		    rm->lock_object.lo_name, file, line));
-		WITNESS_CHECKORDER(&rm->lock_object, LOP_NEWORDER, file, line,
-		    NULL);
+		WITNESS_CHECKORDER(&rm->lock_object,
+		    LOP_NEWORDER | LOP_NOSLEEP, file, line, NULL);
 	}
 
 	if (_rm_rlock(rm, tracker, trylock)) {
@@ -663,7 +663,7 @@
 		else
 			LOCK_LOG_LOCK("RMRLOCK", &rm->lock_object, 0, 0, file,
 			    line);
-		WITNESS_LOCK(&rm->lock_object, 0, file, line);
+		WITNESS_LOCK(&rm->lock_object, LOP_NOSLEEP, file, line);
 		TD_LOCKS_INC(curthread);
 		return (1);
 	} else if (trylock)
Index: head/sys/kern/subr_witness.c
===================================================================
--- head/sys/kern/subr_witness.c
+++ head/sys/kern/subr_witness.c
@@ -131,6 +131,7 @@
 #define	LI_RECURSEMASK	0x0000ffff	/* Recursion depth of lock instance. */
 #define	LI_EXCLUSIVE	0x00010000	/* Exclusive lock instance. */
 #define	LI_NORELEASE	0x00020000	/* Lock not allowed to be released. */
+#define	LI_SLEEPABLE	0x00040000	/* Lock may be held while sleeping. */
 
 #ifndef WITNESS_COUNT
 #define	WITNESS_COUNT 		1536
@@ -1302,7 +1303,7 @@
 			 * If we are locking Giant and this is a sleepable
 			 * lock, then skip it.
 			 */
-			if ((lock1->li_lock->lo_flags & LO_SLEEPABLE) != 0 &&
+			if ((lock1->li_flags & LI_SLEEPABLE) != 0 &&
 			    lock == &Giant.lock_object)
 				continue;
 
@@ -1311,6 +1312,7 @@
 			 * is Giant, then skip it.
 			 */
 			if ((lock->lo_flags & LO_SLEEPABLE) != 0 &&
+			    (flags & LOP_NOSLEEP) == 0 &&
 			    lock1->li_lock == &Giant.lock_object)
 				continue;
 
@@ -1320,15 +1322,16 @@
 			 * order violation to enfore a general lock order of
 			 * sleepable locks before non-sleepable locks.
 			 */
-			if (((lock->lo_flags & LO_SLEEPABLE) != 0 &&
-			    (lock1->li_lock->lo_flags & LO_SLEEPABLE) == 0))
+			if ((lock->lo_flags & LO_SLEEPABLE) != 0 &&
+			    (flags & LOP_NOSLEEP) == 0 &&
+			    (lock1->li_flags & LI_SLEEPABLE) == 0)
 				goto reversal;
 
 			/*
 			 * If we are locking Giant and this is a non-sleepable
 			 * lock, then treat it as a reversal.
 			 */
-			if ((lock1->li_lock->lo_flags & LO_SLEEPABLE) == 0 &&
+			if ((lock1->li_flags & LI_SLEEPABLE) == 0 &&
 			    lock == &Giant.lock_object)
 				goto reversal;
 
@@ -1378,11 +1381,12 @@
 			/*
 			 * Ok, yell about it.
 			 */
-			if (((lock->lo_flags & LO_SLEEPABLE) != 0 &&
-			    (lock1->li_lock->lo_flags & LO_SLEEPABLE) == 0))
+			if ((lock->lo_flags & LO_SLEEPABLE) != 0 &&
+			    (flags & LOP_NOSLEEP) == 0 &&
+			    (lock1->li_flags & LI_SLEEPABLE) == 0)
 				witness_output(
 		"lock order reversal: (sleepable after non-sleepable)\n");
-			else if ((lock1->li_lock->lo_flags & LO_SLEEPABLE) == 0
+			else if ((lock1->li_flags & LI_SLEEPABLE) == 0
 			    && lock == &Giant.lock_object)
 				witness_output(
 		"lock order reversal: (Giant after non-sleepable)\n");
@@ -1440,7 +1444,8 @@
 	 */
 	if (flags & LOP_NEWORDER &&
 	    !(plock->li_lock == &Giant.lock_object &&
-	    (lock->lo_flags & LO_SLEEPABLE) != 0)) {
+	    (lock->lo_flags & LO_SLEEPABLE) != 0 &&
+	    (flags & LOP_NOSLEEP) == 0)) {
 		CTR3(KTR_WITNESS, "%s: adding %s as a child of %s", __func__,
 		    w->w_name, plock->li_lock->lo_witness->w_name);
 		itismychild(plock->li_lock->lo_witness, w);
@@ -1500,10 +1505,11 @@
 	instance->li_lock = lock;
 	instance->li_line = line;
 	instance->li_file = file;
+	instance->li_flags = 0;
 	if ((flags & LOP_EXCLUSIVE) != 0)
-		instance->li_flags = LI_EXCLUSIVE;
-	else
-		instance->li_flags = 0;
+		instance->li_flags |= LI_EXCLUSIVE;
+	if ((lock->lo_flags & LO_SLEEPABLE) != 0 && (flags & LOP_NOSLEEP) == 0)
+		instance->li_flags |= LI_SLEEPABLE;
 	CTR4(KTR_WITNESS, "%s: pid %d added %s as lle[%d]", __func__,
 	    td->td_proc->p_pid, lock->lo_name, lle->ll_count - 1);
 }
@@ -1763,7 +1769,7 @@
 			    lock1->li_lock == &Giant.lock_object)
 				continue;
 			if (flags & WARN_SLEEPOK &&
-			    (lock1->li_lock->lo_flags & LO_SLEEPABLE) != 0)
+			    (lock1->li_flags & LI_SLEEPABLE) != 0)
 				continue;
 			if (n == 0) {
 				va_start(ap, fmt);
Index: head/sys/sys/lock.h
===================================================================
--- head/sys/sys/lock.h
+++ head/sys/sys/lock.h
@@ -107,6 +107,7 @@
 #define	LOP_TRYLOCK	0x00000004	/* Don't check lock order. */
 #define	LOP_EXCLUSIVE	0x00000008	/* Exclusive lock. */
 #define	LOP_DUPOK	0x00000010	/* Don't check for duplicate acquires */
+#define	LOP_NOSLEEP	0x00000020	/* Non-sleepable despite LO_SLEEPABLE */
 
 /* Flags passed to witness_assert. */
 #define	LA_MASKASSERT	0x000000ff	/* Mask for witness defined asserts. */