Index: sys/kern/kern_umtx.c
===================================================================
--- sys/kern/kern_umtx.c
+++ sys/kern/kern_umtx.c
@@ -3123,7 +3123,6 @@
 	umtxq_busy(&key);
 	cnt = umtxq_count(&key);
 	if (cnt > 0) {
-		umtxq_signal(&key, 1);
 		/*
 		 * Check if count is greater than 0, this means the memory is
 		 * still being referenced by user code, so we can safely
@@ -3136,6 +3135,7 @@
 			if (error == -1)
 				error = EFAULT;
 		}
+		umtxq_signal(&key, 1);
 	}
 	umtxq_unbusy(&key);
 	umtxq_unlock(&key);
@@ -3235,8 +3235,6 @@
 	umtxq_busy(&key);
 	cnt = umtxq_count(&key);
 	if (cnt > 0) {
-		umtxq_signal(&key, 1);
-
 		/*
 		 * If this was the last sleeping thread, clear the waiters
 		 * flag in _count.
@@ -3251,6 +3249,8 @@
 				error = EFAULT;
 			umtxq_lock(&key);
 		}
+
+		umtxq_signal(&key, 1);
 	}
 	umtxq_unbusy(&key);
 	umtxq_unlock(&key);