---  sys/geom/geom_vfs.c.orig
+++  sys/geom/geom_vfs.c
@@ -72,6 +72,13 @@
 	int vfslocked;
 
 	if (bip->bio_error) {
+		/*
+		 * XXX: Workaround for bio_to pointing to uninitialized memory
+		 *      after orphaning.
+		 */
+		if (bip->bio_error == ENXIO)
+			bip->bio_to = NULL;
+
 		printf("g_vfs_done():");
 		g_print_bio(bip);
 		printf(": %s\n", strerror(bip->bio_error));