linux-kernel - Re: [syzbot] [ext4?] INFO: task hung in vfs

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Date: Mon,  3 Jun 2024 18:42:11 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+42986aeeddfd7ed93c8b@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] INFO: task hung in vfs_rmdir (2)

On Sun, 02 Jun 2024 20:50:18 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    4a4be1ad3a6e Revert "vfs: Delete the associated dentry whe..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=103820f2980000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  master

--- x/fs/namei.c
+++ y/fs/namei.c
@@ -4198,6 +4198,8 @@ int vfs_rmdir(struct mnt_idmap *idmap, s
 
 	if (!dir->i_op->rmdir)
 		return -EPERM;
+	if (dir == dentry->d_inode)
+		return -EDEADLK;
 
 	dget(dentry);
 	inode_lock(dentry->d_inode);
--