linux-kernel - Re: [syzbot] [cgroups?] [mm?] WARNING in folio

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Message-Id: <B2518F6C-7652-4AE5-AE57-39380E79932D@linux.dev>
Date: Mon, 19 Aug 2024 16:05:41 +0800
From: Muchun Song <muchun.song@...ux.dev>
To: syzbot <syzbot+ef4ecf7b6bdc4157bfa4@...kaller.appspotmail.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 cgroups@...r.kernel.org,
 Johannes Weiner <hannes@...xchg.org>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 Linux Memory Management List <linux-mm@...ck.org>,
 Michal Hocko <mhocko@...nel.org>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 Shakeel Butt <shakeel.butt@...ux.dev>,
 Muchun Song <songmuchun@...edance.com>,
 syzkaller-bugs@...glegroups.com,
 Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [syzbot] [cgroups?] [mm?] WARNING in folio_memcg



> On Aug 19, 2024, at 15:22, syzbot <syzbot+ef4ecf7b6bdc4157bfa4@...kaller.appspotmail.com> wrote:
> 
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    367b5c3d53e5 Add linux-next specific files for 20240816
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=11be396b980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=61ba6f3b22ee5467
> dashboard link: https://syzkaller.appspot.com/bug?extid=ef4ecf7b6bdc4157bfa4
> 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=147469f5980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=153c5ad5980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/0b1b4e3cad3c/disk-367b5c3d.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/5bb090f7813c/vmlinux-367b5c3d.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/6674cb0709b1/bzImage-367b5c3d.xz
> 
> The issue was bisected to:
> 
> commit ebadc95608dc3ee87ad4e5dc4f2c665c709bb899
> Author: Muchun Song <songmuchun@...edance.com>
> Date:   Wed Aug 14 09:34:15 2024 +0000
> 
>    mm: kmem: add lockdep assertion to obj_cgroup_memcg
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=170875f5980000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=148875f5980000
> console output: https://syzkaller.appspot.com/x/log.txt?x=108875f5980000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+ef4ecf7b6bdc4157bfa4@...kaller.appspotmail.com

Thanks for your report. I've fixed this in patch [1].

[1] https://lore.kernel.org/linux-mm/20240819080415.44964-1-songmuchun@bytedance.com/T/#u