D43984.diff
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	diff --git a/sys/kern/kern_umtx.c b/sys/kern/kern_umtx.c
	--- a/sys/kern/kern_umtx.c
	+++ b/sys/kern/kern_umtx.c
	@@ -2684,7 +2684,8 @@
	struct umtx_q uq, uq2;
	struct umtx_pi *pi;
	uint32_t id, owner, rceiling;
	- int error, pri, new_inherited_pri, su;
	+ int error, pri, new_inherited_pri;
	+ bool su;

	id = td->td_tid;
	uq = td->td_umtxq;
	@@ -2739,7 +2740,7 @@
	error = EFAULT;
	else {
	mtx_lock(&umtx_lock);
	- if (su != 0)
	+ if (su \|\| new_inherited_pri == PRI_MAX)
	uq->uq_inherited_pri = new_inherited_pri;
	pri = PRI_MAX;
	TAILQ_FOREACH(pi, &uq->uq_pi_contested, pi_link) {