D49031.1789653583.diff
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D49031.1789653583.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
	@@ -2616,6 +2616,10 @@
	}
	} else if (owner == UMUTEX_RB_NOTRECOV) {
	error = ENOTRECOVERABLE;
	+ } else if (owner == UMUTEX_CONTESTED) {
	+ /* Spurious failure, retry. */
	+ umtxq_unbusy_unlocked(&uq->uq_key);
	+ continue;
	}

	if (try != 0)
	@@ -2834,6 +2838,14 @@
	if (error != 0)
	break;

	+ /*
	+ * We may have gotten a spurious failure.
	+ */
	+ if (owner == UMUTEX_CONTESTED) {
	+ umtxq_unbusy_unlocked(&uq->uq_key);
	+ continue;
	+ }
	+
	/*
	* We set the contested bit, sleep. Otherwise the lock changed
	* and we need to retry or we lost a race to the thread