D7505.id.diff
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	Index: head/sys/kern/kern_umtx.c
	===================================================================
	--- head/sys/kern/kern_umtx.c
	+++ head/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);