Index: sys/libkern/arc4random.c
===================================================================
--- sys/libkern/arc4random.c
+++ 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 +107,8 @@
 				    "enabled.\n");
 		}
 
+		kmsan_mark(key, sizeof(key), KMSAN_STATE_INITED);
+
 		/* Last ditch effort to inject something in a bad condition. */
 		cc = get_cyclecount();
 		SHA256_Init(&ctx);