D37198.id112340.diff
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D37198.id112340.diff
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	diff --git a/sys/kern/vfs_lookup.c b/sys/kern/vfs_lookup.c
	--- a/sys/kern/vfs_lookup.c
	+++ b/sys/kern/vfs_lookup.c
	@@ -1259,6 +1259,12 @@
	* if so find the root of the mounted filesystem.
	*/
	do {
	+ /*
	+ * Ensure that the v_mounthere update from
	+ * vfs_domount() is visible if we saw the
	+ * VIRF_MOUNTPOINT flag.
	+ */
	+ atomic_thread_fence_acq();
	mp = dp->v_mountedhere;
	KASSERT(mp != NULL,
	("%s: NULL mountpoint for VIRF_MOUNTPOINT vnode", __func__));
	diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c
	--- a/sys/kern/vfs_mount.c
	+++ b/sys/kern/vfs_mount.c
	@@ -1202,8 +1202,9 @@
	MNT_IUNLOCK(mp);

	VI_LOCK(vp);
	- vn_irflag_set_locked(vp, VIRF_MOUNTPOINT);
	vp->v_mountedhere = mp;
	+ atomic_thread_fence_rel(); /* see vfs_lookup() */
	+ vn_irflag_set_locked(vp, VIRF_MOUNTPOINT);
	VI_UNLOCK(vp);
	cache_purge(vp);