D49031.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)
	@@ -2825,6 +2829,10 @@
	} else if (owner == UMUTEX_RB_NOTRECOV) {
	error = ENOTRECOVERABLE;
	break;
	+ } else if (owner == UMUTEX_CONTESTED) {
	+ /* Spurious failure, retry. */
	+ umtxq_unbusy_unlocked(&uq->uq_key);
	+ continue;
	}

	/*