Index: xfs_mountops.c
===================================================================
--- xfs_mountops.c	(revision 230661)
+++ xfs_mountops.c	(working copy)
@@ -226,7 +226,9 @@
         if (mp->mnt_iosize_max > MAXPHYS)
 		mp->mnt_iosize_max = MAXPHYS;
 
+        MNT_ILOCK(mp);
         mp->mnt_flag |= MNT_LOCAL;
+        MNT_IUNLOCK(mp);
         mp->mnt_stat.f_fsid.val[0] = dev2udev(ddev);
         mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;