diff --git a/usr.sbin/bhyve/pci_nvme.c b/usr.sbin/bhyve/pci_nvme.c
--- a/usr.sbin/bhyve/pci_nvme.c
+++ b/usr.sbin/bhyve/pci_nvme.c
@@ -485,7 +485,7 @@
 	} else {
 		struct nvme_submission_queue *sq = sc->submit_queues;
 
-		for (i = 0; i < sc->num_squeues; i++)
+		for (i = 0; i < sc->num_squeues + 1; i++)
 			pthread_mutex_init(&sq[i].mtx, NULL);
 	}
 
@@ -508,7 +508,7 @@
 	} else {
 		struct nvme_completion_queue *cq = sc->compl_queues;
 
-		for (i = 0; i < sc->num_cqueues; i++)
+		for (i = 0; i < sc->num_cqueues + 1; i++)
 			pthread_mutex_init(&cq[i].mtx, NULL);
 	}
 }
diff --git a/usr.sbin/bhyve/pci_virtio_console.c b/usr.sbin/bhyve/pci_virtio_console.c
--- a/usr.sbin/bhyve/pci_virtio_console.c
+++ b/usr.sbin/bhyve/pci_virtio_console.c
@@ -698,6 +698,8 @@
 	sc->vsc_config->cols = 80;
 	sc->vsc_config->rows = 25;
 
+	pthread_mutex_init(&sc->vsc_mtx, NULL);
+
 	vi_softc_linkup(&sc->vsc_vs, &vtcon_vi_consts, sc, pi, sc->vsc_queues);
 	sc->vsc_vs.vs_mtx = &sc->vsc_mtx;
 
diff --git a/usr.sbin/bhyve/pci_virtio_rnd.c b/usr.sbin/bhyve/pci_virtio_rnd.c
--- a/usr.sbin/bhyve/pci_virtio_rnd.c
+++ b/usr.sbin/bhyve/pci_virtio_rnd.c
@@ -179,6 +179,8 @@
 
 	sc = calloc(1, sizeof(struct pci_vtrnd_softc));
 
+	pthread_mutex_init(&sc->vrsc_mtx, NULL);
+
 	vi_softc_linkup(&sc->vrsc_vs, &vtrnd_vi_consts, sc, pi, &sc->vrsc_vq);
 	sc->vrsc_vs.vs_mtx = &sc->vrsc_mtx;
 
diff --git a/usr.sbin/bhyve/pci_virtio_scsi.c b/usr.sbin/bhyve/pci_virtio_scsi.c
--- a/usr.sbin/bhyve/pci_virtio_scsi.c
+++ b/usr.sbin/bhyve/pci_virtio_scsi.c
@@ -700,6 +700,8 @@
 		return (1);
 	}
 
+	pthread_mutex_init(&sc->vss_mtx, NULL);
+
 	vi_softc_linkup(&sc->vss_vs, &vtscsi_vi_consts, sc, pi, sc->vss_vq);
 	sc->vss_vs.vs_mtx = &sc->vss_mtx;