D58626.diff
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	diff --git a/sys/fs/autofs/autofs_vnops.c b/sys/fs/autofs/autofs_vnops.c
	--- a/sys/fs/autofs/autofs_vnops.c
	+++ b/sys/fs/autofs/autofs_vnops.c
	@@ -136,16 +136,22 @@
	struct vnode **newvp)
	{
	struct autofs_node *anp;
	+ struct mount *mp;
	int error, lock_flags;

	anp = vp->v_data;

	/*
	- * Release the vnode lock, so that other operations, in partcular
	- * mounting a filesystem on top of it, can proceed. Increase use
	- * count, to prevent the vnode from being deallocated and to prevent
	- * filesystem from being unmounted.
	+ * Release the vnode lock, so that other operations, in
	+ * particular mounting a filesystem on top of it, can proceed.
	+ * Increase use count and busy the mount, to prevent the vnode
	+ * from being deallocated and to prevent filesystem from being
	+ * unmounted.
	*/
	+ mp = vp->v_mount;
	+ error = vfs_busy(mp, MBF_NOWAIT);
	+ if (error != 0)
	+ return (error);
	lock_flags = VOP_ISLOCKED(vp);
	vref(vp);
	VOP_UNLOCK(vp);
	@@ -165,6 +171,7 @@
	sx_xunlock(&autofs_softc->sc_lock);
	vn_lock(vp, lock_flags \| LK_RETRY);
	vunref(vp);
	+ vfs_unbusy(mp);
	if (VN_IS_DOOMED(vp)) {
	AUTOFS_DEBUG("VIRF_DOOMED");
	return (ENOENT);