D27327.diff
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	Index: head/sys/kern/vfs_mount.c
	===================================================================
	--- head/sys/kern/vfs_mount.c
	+++ head/sys/kern/vfs_mount.c
	@@ -903,6 +903,7 @@
	struct mount *mp;
	struct vnode newdp, rootvp;
	int error, error1;
	+ bool unmounted;

	ASSERT_VOP_ELOCKED(vp, __func__);
	KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
	@@ -964,23 +965,39 @@
	* get. No freeing of cn_pnbuf.
	*/
	error1 = 0;
	+ unmounted = true;
	if ((error = VFS_MOUNT(mp)) != 0 \|\|
	(error1 = VFS_STATFS(mp, &mp->mnt_stat)) != 0 \|\|
	(error1 = VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) != 0) {
	rootvp = NULL;
	if (error1 != 0) {
	- error = error1;
	+ MPASS(error == 0);
	rootvp = vfs_cache_root_clear(mp);
	if (rootvp != NULL) {
	vhold(rootvp);
	vrele(rootvp);
	}
	- if ((error1 = VFS_UNMOUNT(mp, 0)) != 0)
	- printf("VFS_UNMOUNT returned %d\n", error1);
	+ (void)vn_start_write(NULL, &mp, V_WAIT);
	+ MNT_ILOCK(mp);
	+ mp->mnt_kern_flag \|= MNTK_UNMOUNT \| MNTK_UNMOUNTF;
	+ MNT_IUNLOCK(mp);
	+ VFS_PURGE(mp);
	+ error = VFS_UNMOUNT(mp, 0);
	+ vn_finished_write(mp);
	+ if (error != 0) {
	+ printf(
	+ "failed post-mount (%d): rollback unmount returned %d\n",
	+ error1, error);
	+ unmounted = false;
	+ }
	+ error = error1;
	}
	vfs_unbusy(mp);
	mp->mnt_vnodecovered = NULL;
	- vfs_mount_destroy(mp);
	+ if (unmounted) {
	+ /* XXXKIB wait for mnt_lockref drain? */
	+ vfs_mount_destroy(mp);
	+ }
	VI_LOCK(vp);
	vp->v_iflag &= ~VI_MOUNT;
	VI_UNLOCK(vp);