From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f77.google.com (mail-oo1-f77.google.com [209.85.161.77]) (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 4B23BA937 for ; Thu, 11 Dec 2025 18:38:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765478313; cv=none; b=F6txLTORQDbm78uTbd0r0op2rtClt8kH+Kd0+YWbj7t2FPTs/48O+jsq/EAr/GixH2rpkrL6HGV4dnimaszZkp8bqoJ+ciQ7cd3jTzbg1Yt7GNOWwVKVoGbNBSsysIbWsU33kNRVlK7of3JEvenaC5UIora7GTBuC+ihVFpUV0k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765478313; c=relaxed/simple; bh=KjN2TfuFunnBIIjIY5/NDtntkHTxpWh/AWfe8kSHgJ8=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=H6iG/RVW7+A0fGx3m4nuSqgndLCsJv940atPkHWlWBUhF4fl8fmMymTvlpwfTT1qgi+1ZphNxuGV2LpiD+oYwVcLJiYB+UDuG8pkesMq4pFeHw0NeJE37K5AwS1V5kENLir5136WDdYy4ohhGRPRkXdY83aIMmjIEgB566q3JcY= 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=209.85.161.77 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-oo1-f77.google.com with SMTP id 006d021491bc7-65747f4376bso582242eaf.2 for ; Thu, 11 Dec 2025 10:38:32 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765478311; x=1766083111; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=gmftX27Q/W7fyuelLAuPg2KIcheP2mgJj3RegfphCow=; b=ZcCtj9GiAf+5FKg5CchhHSTl4xMEHhQlT1YWjkXQ0zD+vS71vW6/enNvX2B6v+yOS6 udW0dGe3tKfDG80xCnzTiKcyPSfYP+IxO3gz6d9yz1uUYkf22WR9ene9EDxS3I1YunO+ Oi+HtIM4L6mgznBX7TSCWkrJWcnlsjDB04Hi1E5T9rbIj6Exwvy6vA7HaU1xbZjboKiD ShXFXWv1IgOjYvovEZJHN+ydHXqhWCVBRNctRIHHxsgE9/82xzy8n7BE0GXhcZAZyUGj yodA2Zt0CDWm2AYK7qZRkdM+Y+1v7tbtoQiPh32zA5IptJViCSUJE1hGfEqdQ/KZG224 //nw== X-Forwarded-Encrypted: i=1; AJvYcCWw0M0q8gWB/yU3gs+LMXl6CGdCTNVxf+SqT9HdLi+5mDnyUvOBiRRzZxr3tj2iY/qyWmCAedI=@vger.kernel.org X-Gm-Message-State: AOJu0Yy8o3+RM86WMZS5fczatKIrYw4vz/WEjxXjqndNM0m9iU4d3ORF 6ljc1X3xYDFGR4E+UAu+2gzqx6Nvw/x+xpPt3t/KGJ6MVleV5tEbzqz2/w4lTLWUmjiIFDaxs1N vf0SPeBYZ48SuQ+gERKAS8Cx4oUceAIQsaPWQxWnK9i6OqPiM+Gn3Hr3MAGo= X-Google-Smtp-Source: AGHT+IEUZS5AFevvdPKWhnZ6WlvBNFsQ70+WT7EWv59zCjxEhfcLDn8Ymyg1BUg3wUcIiYnNXj08X8qEp6wSFad0/LEsPgoZ6dnq Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:f033:b0:657:4f2:97b2 with SMTP id 006d021491bc7-65b2aaeb8d3mr3768233eaf.0.1765478311480; Thu, 11 Dec 2025 10:38:31 -0800 (PST) Date: Thu, 11 Dec 2025 10:38:31 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <693b0fa7.050a0220.4004e.040d.GAE@google.com> Subject: [syzbot] [netfilter?] WARNING in nf_conntrack_cleanup_net_list From: syzbot To: coreteam@netfilter.org, davem@davemloft.net, edumazet@google.com, fw@strlen.de, horms@kernel.org, kadlec@netfilter.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pabeni@redhat.com, pablo@netfilter.org, phil@nwl.cc, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 5ce74bc1b7cb Add linux-next specific files for 20251211 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=11a241b4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a94030c847137a18 dashboard link: https://syzkaller.appspot.com/bug?extid=4393c47753b7808dac7d 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/e1660176a50f/disk-5ce74bc1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/616ede012bbd/vmlinux-5ce74bc1.xz kernel image: https://storage.googleapis.com/syzbot-assets/7c0c5bc40fd8/bzImage-5ce74bc1.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4393c47753b7808dac7d@syzkaller.appspotmail.com ------------[ cut here ]------------ conntrack cleanup blocked for 60s WARNING: net/netfilter/nf_conntrack_core.c:2512 at nf_conntrack_cleanup_net_list+0x234/0x340 net/netfilter/nf_conntrack_core.c:2511, CPU#1: kworker/u8:0/12 Modules linked in: CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: netns cleanup_net RIP: 0010:nf_conntrack_cleanup_net_list+0x234/0x340 net/netfilter/nf_conntrack_core.c:2511 Code: 08 48 89 df e8 fd 78 a3 f8 4c 8b 3b 49 39 df 74 69 e8 20 16 3d f8 45 31 e4 e9 8e fe ff ff e8 13 16 3d f8 48 8d 3d ec 2f 0c 06 <67> 48 0f b9 3a eb c0 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c cd fe ff RSP: 0018:ffffc90000117870 EFLAGS: 00010293 RAX: ffffffff8984a13d RBX: ffffc90000117a00 RCX: ffff88801ce8db80 RDX: 0000000000000000 RSI: ffffffffffffffcb RDI: ffffffff8f90d130 RBP: 0000000000000001 R08: ffff88807ce6b003 R09: 1ffff1100f9cd600 R10: dffffc0000000000 R11: ffffed100f9cd601 R12: 0000000000000001 R13: dffffc0000000000 R14: 00000001000068e3 R15: 0000000100006918 FS: 0000000000000000(0000) GS:ffff888125f32000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000020000 CR3: 00000000306ac000 CR4: 00000000003526f0 Call Trace: ops_exit_list net/core/net_namespace.c:205 [inline] ops_undo_list+0x525/0x990 net/core/net_namespace.c:252 cleanup_net+0x4d8/0x7a0 net/core/net_namespace.c:696 process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279 process_scheduled_works kernel/workqueue.c:3362 [inline] worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 ---------------- Code disassembly (best guess): 0: 08 48 89 or %cl,-0x77(%rax) 3: df e8 fucomip %st(0),%st 5: fd std 6: 78 a3 js 0xffffffab 8: f8 clc 9: 4c 8b 3b mov (%rbx),%r15 c: 49 39 df cmp %rbx,%r15 f: 74 69 je 0x7a 11: e8 20 16 3d f8 call 0xf83d1636 16: 45 31 e4 xor %r12d,%r12d 19: e9 8e fe ff ff jmp 0xfffffeac 1e: e8 13 16 3d f8 call 0xf83d1636 23: 48 8d 3d ec 2f 0c 06 lea 0x60c2fec(%rip),%rdi # 0x60c3016 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: eb c0 jmp 0xfffffff1 31: 89 e9 mov %ebp,%ecx 33: 80 e1 07 and $0x7,%cl 36: 80 c1 03 add $0x3,%cl 39: 38 c1 cmp %al,%cl 3b: 0f .byte 0xf 3c: 8c cd mov %cs,%ebp 3e: fe (bad) 3f: ff .byte 0xff --- 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