Index: sys/kern/vfs_subr.c
===================================================================
--- sys/kern/vfs_subr.c
+++ sys/kern/vfs_subr.c
@@ -3191,6 +3191,7 @@
 	db_printf("    mnt_maxsymlinklen = %d\n", mp->mnt_maxsymlinklen);
 	db_printf("    mnt_iosize_max = %d\n", mp->mnt_iosize_max);
 	db_printf("    mnt_hashseed = %u\n", mp->mnt_hashseed);
+	db_printf("    mnt_lockref = %d\n", mp->mnt_lockref);
 	db_printf("    mnt_secondary_writes = %d\n", mp->mnt_secondary_writes);
 	db_printf("    mnt_secondary_accwrites = %d\n",
 	    mp->mnt_secondary_accwrites);