linux-kernel - Re: [syzbot] WARNING in kernfs_remove_by_name

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Date: Wed, 15 May 2024 18:29:44 +0200
From: David Sterba <dsterba@...e.cz>
To: syzbot <syzbot+93cbdd0ab421adc5275d@...kaller.appspotmail.com>
Cc: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com, tj@...nel.org
Subject: Re: [syzbot] WARNING in kernfs_remove_by_name_ns (3)

On Mon, Nov 08, 2021 at 03:24:26AM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    ce840177930f Merge tag 'defconfig-5.16' of git://git.kerne..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1516eb12b00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=647adc5a101c9bf3
> dashboard link: https://syzkaller.appspot.com/bug?extid=93cbdd0ab421adc5275d
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+93cbdd0ab421adc5275d@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> kernfs: can not remove 'nr_tags', no directory
> WARNING: CPU: 0 PID: 352 at fs/kernfs/dir.c:1535 kernfs_remove_by_name_ns+0x96/0xa0 fs/kernfs/dir.c:1535

#syz set subsystems: kernfs

Remove btrfs from subsystems.  Multiple reports, injected ENOMEM and
sysfs cannot remove the files and warns

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/kernfs/dir.c?id=d3fa86b1a7b4cdc4367acacea16b72e0a200b3d7#n1662