Index: usr.sbin/bhyve/pci_virtio_net.c
===================================================================
--- usr.sbin/bhyve/pci_virtio_net.c
+++ usr.sbin/bhyve/pci_virtio_net.c
@@ -582,10 +582,12 @@
 	/*
 	 * A qnotify means that the rx process can now begin
 	 */
+	pthread_mutex_lock(&sc->rx_mtx);
 	if (sc->vsc_rx_ready == 0) {
 		sc->vsc_rx_ready = 1;
 		vq_kick_disable(vq);
 	}
+	pthread_mutex_unlock(&sc->rx_mtx);
 }
 
 static void