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([2601:648:8100:3b5:c6ef:bbff:fec0:9e95]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2365d88c239sm70416975ad.11.2025.06.16.21.46.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 16 Jun 2025 21:46:54 -0700 (PDT) Message-ID: Date: Mon, 16 Jun 2025 21:46:52 -0700 Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [cgroups?] WARNING in css_rstat_exit To: =?UTF-8?Q?Michal_Koutn=C3=BD?= , syzbot Cc: cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tj@kernel.org References: <684c5802.a00a0220.279073.0016.GAE@google.com> Content-Language: en-US From: JP Kobryn In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 6/16/25 2:49 AM, Michal Koutný wrote: > +Cc: JP Thanks. Looking into this. > > On Fri, Jun 13, 2025 at 09:55:30AM -0700, syzbot 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@syzkaller.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: >> >> 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 >> >> >> >> --- >> 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@googlegroups.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