--- sys/dev/virtio/random/virtio_random.c.orig	2022-02-04 20:36:41.288163000 +0000
+++ sys/dev/virtio/random/virtio_random.c	2022-03-11 00:47:55.303250000 +0000
@@ -223,6 +223,8 @@ vtrnd_alloc_virtqueue(struct vtrnd_softc *sc)
 	return (virtio_alloc_virtqueues(dev, 0, 1, &vq_info));
 }
 
+extern int rebooting;
+
 static int
 vtrnd_harvest(struct vtrnd_softc *sc, void *buf, size_t *sz)
 {
@@ -232,6 +234,9 @@ vtrnd_harvest(struct vtrnd_softc *sc, void *buf, size_
 	uint32_t value[HARVESTSIZE] __aligned(sizeof(uint32_t) * HARVESTSIZE);
 	uint32_t rdlen;
 	int error;
+
+	if (rebooting)
+		return (EDEADLK);
 
 	_Static_assert(sizeof(value) < PAGE_SIZE, "sglist assumption");