D37198.diff
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	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
	@@ -1201,10 +1201,16 @@
	mp->mnt_kern_flag &= ~MNTK_ASYNC;
	MNT_IUNLOCK(mp);

	+ /*
	+ * VIRF_MOUNTPOINT and v_mountedhere need to be set under the
	+ * vp lock to satisfy vfs_lookup() requirements.
	+ */
	+ VOP_LOCK(vp, LK_EXCLUSIVE \| LK_RETRY);
	VI_LOCK(vp);
	vn_irflag_set_locked(vp, VIRF_MOUNTPOINT);
	vp->v_mountedhere = mp;
	VI_UNLOCK(vp);
	+ VOP_UNLOCK(vp);
	cache_purge(vp);

	/*