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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <vjqyx3bkhyomb6zafk5xmjpfsitmqll3wcoean3orwpl7vkgb3@pbo33km36ek2>
Date: Mon, 16 Jun 2025 11:49:22 +0200
From: Michal Koutný <mkoutny@...e.com>
To: syzbot <syzbot+8d052e8b99e40bc625ed@...kaller.appspotmail.com>
Cc: cgroups@...r.kernel.org, hannes@...xchg.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, tj@...nel.org, 
	JP Kobryn <inwardvessel@...il.com>
Subject: Re: [syzbot] [cgroups?] WARNING in css_rstat_exit

+Cc: JP

On Fri, Jun 13, 2025 at 09:55:30AM -0700, syzbot <syzbot+8d052e8b99e40bc625ed@...kaller.appspotmail.com> wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    27605c8c0f69 Merge tag 'net-6.16-rc2' of git://git.kernel...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=103b1e0c580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=89df02a4e09cb64d
> dashboard link: https://syzkaller.appspot.com/bug?extid=8d052e8b99e40bc625ed
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/79ab1e186123/disk-27605c8c.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/d37bf85b966d/vmlinux-27605c8c.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/eed2865abf8f/bzImage-27605c8c.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+8d052e8b99e40bc625ed@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 5887 at kernel/cgroup/rstat.c:497 css_rstat_exit+0x368/0x470 kernel/cgroup/rstat.c:497
> Modules linked in:
> CPU: 0 UID: 0 PID: 5887 Comm: kworker/0:5 Not tainted 6.16.0-rc1-syzkaller-00101-g27605c8c0f69 #0 PREEMPT(full) 
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
> Workqueue: cgroup_destroy css_free_rwork_fn
> RIP: 0010:css_rstat_exit+0x368/0x470 kernel/cgroup/rstat.c:497
> Code: 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 0e 01 00 00 49 c7 85 70 05 00 00 00 00 00 00 e9 00 ff ff ff e8 c9 07 07 00 90 <0f> 0b 90 e9 3e ff ff ff e8 bb 07 07 00 90 0f 0b 90 e9 30 ff ff ff
> RSP: 0000:ffffc9000b6afbc0 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffff888057c7a800 RCX: ffff888124754000
> RDX: ffff8880308b8000 RSI: ffffffff81b514e7 RDI: ffffffff8df26da0
> RBP: ffff888057c7a808 R08: 0000000000000005 R09: 0000000000000007
> R10: 0000000000000000 R11: 0000000000000001 R12: ffff888057c7a820
> R13: 0000000000000000 R14: 0000000000000003 R15: dffffc0000000000
> FS:  0000000000000000(0000) GS:ffff888124754000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001b31b10ff8 CR3: 0000000079092000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  css_free_rwork_fn+0x80/0x12e0 kernel/cgroup/cgroup.c:5449
>  process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
>  process_scheduled_works kernel/workqueue.c:3321 [inline]
>  worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
>  kthread+0x3c5/0x780 kernel/kthread.c:464
>  ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>  </TASK>
> 
> 
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> 
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
> 
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
> 
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
> 
> If you want to undo deduplication, reply with:
> #syz undup

Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)