From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D7BE6318149 for ; Thu, 13 Nov 2025 22:58:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763074711; cv=none; b=h3IjDZ1UAdsBpYR8z1KnCVH9W5uGsHOQFsBwBT6g1Ylzu/uMg3hayWagoryAjdQgX3qahRmbKtSxP5hx82wClTScUpz58ka3GUcKDpzV9RMAvgfGZlxdrqsZBj9JIW7UXoVj2RhaPcK1Ns/6RrXBL0wkJh+P/xn09Fbc43XKKmM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763074711; c=relaxed/simple; bh=lSnLSpH9yQtYLu9Cf0IZtLu/UJTSJFKK+fhiJhNtdlw=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=E0/+C2qX+HHByZs4IvdTeRHO1OQQCCS8/Ch5BJRxUYgzk/UtuO+s6V54dE6+AcZloV1KYyNgBGOSrH3MWIVCNN8bVt60CsT0zS3dWtjtmkYr/Magz0JO7eFxSkYqR+nB/J6PrTIHmZkYioTC0DsAiGCQkDYQeKVy5IjbcSsnVo0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.208 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f208.google.com with SMTP id e9e14a558f8ab-43321627eabso48438905ab.3 for ; Thu, 13 Nov 2025 14:58:29 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763074709; x=1763679509; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=CbtkDKlNE4tc2jFqlzeAg93Hnuv/kf1WNddQKsE9QL8=; b=Q1qqj7O2pRuT8EncC/lSqPYCsS9eFI4KuusOW69hiO7+DWJDHw2q3XG/bTw/2O6IL3 YU9LFX2KOnzOsbsUJNJf4JlXsuYbUJLdv9bEOuLMn+xeENdbuVnzGlZLNkQVhVM4r6rz Z882XETHdu7rDMBIWaROAiMBz50ks3U7QjBUTcAwp/rgxFeO0bCulLDoADReqDFvSjPP Ry8vQxxJXnf5bslqIx0ntB8DhrzTO9Cr1T4Ce2T0NHuyb6UFGBLuXigXgq/mJoLvXXAp nyiHX/1yZ7j0EVLHqt74OuffbVpmnHOx/OolmHvXY57O4mV1IZ2bq6TVIVCiUaT32Vvz /vbA== X-Gm-Message-State: AOJu0YweIAybpwvG0GrZIaopyWT6WGRqvFvahPgk5hYy9DAXkrbrJq5X 5a7kSitu6krSia5yy3D02k74fO22iRBj4IGvkgkFPDXQGhEOB+kOAwWaYGQBSaChfmcx1v+sptS 3rYH7hy8HKxDna/OaxV0jtKojvIirbvzW2FUXRawu+9mB+RhGema1L/+qg3vo7A== X-Google-Smtp-Source: AGHT+IFZJDGEH7soMYdKCftMSeID1zI6Cg6qNpr8QZgqxXCre2smu0EBx/q8FxAr3JZ/bP0D5YT4lFehfPPfWBcMOPxI8jdX2f1I Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2292:b0:433:4fc9:7b3d with SMTP id e9e14a558f8ab-4348c91d7b2mr19702505ab.22.1763074709149; Thu, 13 Nov 2025 14:58:29 -0800 (PST) Date: Thu, 13 Nov 2025 14:58:29 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69166295.a70a0220.3124cb.0036.GAE@google.com> Subject: [syzbot] [cgroups?] WARNING in cgroup_file_release From: syzbot To: cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, mkoutny@suse.com, syzkaller-bugs@googlegroups.com, tj@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 9c0826a5d9aa Add linux-next specific files for 20251107 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12a5d0b4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4f8fcc6438a785e7 dashboard link: https://syzkaller.appspot.com/bug?extid=da9171e60819297fc1d3 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6b76dc0ec17f/disk-9c0826a5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/522b6d2a1d1d/vmlinux-9c0826a5.xz kernel image: https://storage.googleapis.com/syzbot-assets/4a58225d70f3/bzImage-9c0826a5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+da9171e60819297fc1d3@syzkaller.appspotmail.com netlink: 16 bytes leftover after parsing attributes in process `syz.2.623'. ------------[ cut here ]------------ WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#1: syz.2.623/8079 WARNING: ./include/linux/ns_common.h:255 at put_cgroup_ns include/linux/cgroup_namespace.h:39 [inline], CPU#1: syz.2.623/8079 WARNING: ./include/linux/ns_common.h:255 at cgroup_file_release+0x196/0x1d0 kernel/cgroup/cgroup.c:4282, CPU#1: syz.2.623/8079 Modules linked in: CPU: 1 UID: 0 PID: 8079 Comm: syz.2.623 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__ns_ref_put include/linux/ns_common.h:255 [inline] RIP: 0010:put_cgroup_ns include/linux/cgroup_namespace.h:39 [inline] RIP: 0010:cgroup_file_release+0x196/0x1d0 kernel/cgroup/cgroup.c:4282 Code: 3b 00 74 08 4c 89 ef e8 a8 44 6e 00 49 c7 45 00 00 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 bb d8 07 00 90 <0f> 0b 90 eb 9d e8 b0 d8 07 00 4c 89 e7 be 03 00 00 00 e8 e3 d2 df RSP: 0018:ffffc9000eaef8c8 EFLAGS: 00010293 RAX: ffffffff81b9f775 RBX: 1ffff1100bc32a83 RCX: ffff88802990db80 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000 RBP: 00000000ffffffff R08: ffff8880796780bb R09: 1ffff1100f2cf017 R10: dffffc0000000000 R11: ffffed100f2cf018 R12: ffff8880796780b8 R13: ffff88805e195418 R14: ffff88805c63a100 R15: ffff888079678000 FS: 0000000000000000(0000) GS:ffff888125b79000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000011c0 CR3: 000000007b8ee000 CR4: 00000000003526f0 Call Trace: kernfs_release_file+0x131/0x2d0 fs/kernfs/file.c:764 kernfs_fop_release+0x113/0x190 fs/kernfs/file.c:779 __fput+0x44c/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x6bd/0x2300 kernel/exit.c:970 do_group_exit+0x21c/0x2d0 kernel/exit.c:1111 get_signal+0x1285/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2e9/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9b5b38f6c9 Code: Unable to access opcode bytes at 0x7f9b5b38f69f. RSP: 002b:00007f9b5c2910e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f9b5b5e5fa8 RCX: 00007f9b5b38f6c9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f9b5b5e5fa8 RBP: 00007f9b5b5e5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9b5b5e6038 R14: 00007ffe297b11d0 R15: 00007ffe297b12b8 --- 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