linux-kernel - Re: [syzbot] [mm?] [bcachefs?] WARNING in lock_list_lru_of

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Message-Id: <20250214152358.7ba29d10229e2155c0899774@linux-foundation.org>
Date: Fri, 14 Feb 2025 15:23:58 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: syzbot <syzbot+38a0cbd267eff2d286ff@...kaller.appspotmail.com>
Cc: chengming.zhou@...ux.dev, hannes@...xchg.org, kasong@...cent.com,
 kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org, mhocko@...e.com,
 muchun.song@...ux.dev, roman.gushchin@...ux.dev, ryncsn@...il.com,
 sashal@...nel.org, shakeel.butt@...ux.dev, syzkaller-bugs@...glegroups.com,
 willy@...radead.org, yuzhao@...gle.com, zhengqi.arch@...edance.com
Subject: Re: [syzbot] [mm?] [bcachefs?] WARNING in lock_list_lru_of_memcg

On Fri, 14 Feb 2025 10:11:19 -0800 syzbot <syzbot+38a0cbd267eff2d286ff@...kaller.appspotmail.com> wrote:

> syzbot has found a reproducer for the following issue on:

Thanks.  I doubt if bcachefs is implicated in this?

> HEAD commit:    128c8f96eb86 Merge tag 'drm-fixes-2025-02-14' of https://g..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=148019a4580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c776e555cfbdb82d
> dashboard link: https://syzkaller.appspot.com/bug?extid=38a0cbd267eff2d286ff
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12328bf8580000
> 
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-128c8f96.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/a97f78ac821e/vmlinux-128c8f96.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/f451cf16fc9f/bzImage-128c8f96.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/a7da783f97cf/mount_3.gz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+38a0cbd267eff2d286ff@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 5459 at mm/list_lru.c:96 lock_list_lru_of_memcg+0x39e/0x4d0 mm/list_lru.c:96

	VM_WARN_ON(!css_is_dying(&memcg->css));

>
> ...
>