D31510.diff
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	diff --git a/sys/libkern/arc4random.c b/sys/libkern/arc4random.c
	--- a/sys/libkern/arc4random.c
	+++ b/sys/libkern/arc4random.c
	@@ -34,6 +34,7 @@
	#include <sys/linker.h>
	#include <sys/lock.h>
	#include <sys/malloc.h>
	+#include <sys/msan.h>
	#include <sys/mutex.h>
	#include <sys/random.h>
	#include <sys/smp.h>
	@@ -106,6 +107,14 @@
	"enabled.\n");
	}

	+ /*
	+ * "key" is intentionally left uninitialized here, so with KMSAN
	+ * enabled the arc4random() return value may be marked
	+ * uninitialized, leading to spurious reports. Lie to KMSAN to
	+ * avoid this situation.
	+ */
	+ kmsan_mark(key, sizeof(key), KMSAN_STATE_INITED);
	+
	/* Last ditch effort to inject something in a bad condition. */
	cc = get_cyclecount();
	SHA256_Init(&ctx);