D35477.diff
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	diff --git a/sys/fs/nullfs/null_vnops.c b/sys/fs/nullfs/null_vnops.c
	--- a/sys/fs/nullfs/null_vnops.c
	+++ b/sys/fs/nullfs/null_vnops.c
	@@ -989,9 +989,11 @@

	locked = VOP_ISLOCKED(vp);
	lvp = NULLVPTOLOWERVP(vp);
	- vhold(lvp);
	mp = vp->v_mount;
	- vfs_ref(mp);
	+ error = vfs_busy(mp, MBF_NOWAIT);
	+ if (error != 0)
	+ return (error);
	+ vhold(lvp);
	VOP_UNLOCK(vp); /* vp is held by vn_vptocnp_locked that called us */
	ldvp = lvp;
	vref(lvp);
	@@ -999,7 +1001,7 @@
	vdrop(lvp);
	if (error != 0) {
	vn_lock(vp, locked \| LK_RETRY);
	- vfs_rel(mp);
	+ vfs_unbusy(mp);
	return (ENOENT);
	}

	@@ -1007,7 +1009,7 @@
	if (error != 0) {
	vrele(ldvp);
	vn_lock(vp, locked \| LK_RETRY);
	- vfs_rel(mp);
	+ vfs_unbusy(mp);
	return (ENOENT);
	}
	error = null_nodeget(mp, ldvp, dvp);
	@@ -1018,7 +1020,7 @@
	VOP_UNLOCK(dvp); / keep reference on dvp /
	}
	vn_lock(vp, locked \| LK_RETRY);
	- vfs_rel(mp);
	+ vfs_unbusy(mp);
	return (error);
	}