diff --git a/fs/namespace.c b/fs/namespace.c
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -888,8 +888,9 @@ static int show_mountinfo(struct seq_file *m, void *v)
 		   MAJOR(sb->s_dev), MINOR(sb->s_dev));
 	seq_dentry(m, mnt->mnt_root, " \t\n\\");
 	seq_putc(m, ' ');
-	seq_path_root(m, &mnt_path, &root, " \t\n\\");
-	if (root.mnt != p->root.mnt || root.dentry != p->root.dentry) {
+	err = seq_path_root(m, &mnt_path, &root, " \t\n\\");
+	if (root.mnt != p->root.mnt || root.dentry != p->root.dentry ||
+							err == -EINVAL) {
 		/*
 		 * Mountpoint is outside root, discard that one.  Ugly,
 		 * but less so than trying to do that in iterator in a