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diff --git a/sys/fs/nullfs/null_vfsops.c b/sys/fs/nullfs/null_vfsops.c
--- a/sys/fs/nullfs/null_vfsops.c
+++ b/sys/fs/nullfs/null_vfsops.c
@@ -151,6 +151,14 @@
*/
lowerrootvp = ndp->ni_vp;
+ /*
+ * Do not allow to mount a vnode over itself.
+ */
+ if (mp->mnt_vnodecovered == lowerrootvp) {
+ vput(lowerrootvp);
+ return (EDEADLK);
+ }
+
/*
* Check multi null mount to avoid `lock against myself' panic.
*/

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