From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo2-f0.google.com (mail-oo2-f0.google.com [74.125.231.128]) (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 802FC429000 for ; Tue, 15 Sep 2026 22:34:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.128 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789511675; cv=none; b=sLG02ws7AALg+uWu69CJXe6xjvayma9LAwfUn+wrFfIqT5I0WQ3M7On+UspmhyXWDahh6VFZ36YQ5I1LDD7/S+a3YbDMf7LOsVYXk2f1lsqbiqfWaMo2FrQ+xPDlNlsBHDCDs8Wd/9VWYqrfVuXPJHeUvMbg6vQ3segEnu8BCQ8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789511675; c=relaxed/simple; bh=SKDIl6gUKjcd7PZ7p59sq7JLrAihNvMJGUpWGd0ydmA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=R415Y/Tbd4iWT+OyJ6wmqFR7Z1xOpZpsxpxETNwWQBPJhyYdJ/MSV3veIxq2mmYpifTyyWz00fv/OBEyPvF+6Is55kKNR4bLZLi98F59Zv6cGGea4ecjTMQNocgtoVgq3yAtsJ14ei2lHE1CGifufWUDRyeB+fiulAeyF/8caeo= 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=74.125.231.128 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-oo2-f0.google.com with SMTP id 006d021491bc7-6a3900cb2b5so2141939eaf.0 for ; Tue, 15 Sep 2026 15:34:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789511672; x=1790116472; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=TBWFnaWw5jXr3ddwzQPC0GqRWckCJTkWzckXqZAhHFI=; b=nX8jZmGK22kVm+HHq5qJkNSmKpPIAWDZPVUmkRuyqbRvxQm3QPEQOEjM4ghK0a+ZQ9 n8hpMsLjmXUe9KRi57gIY7gJBQq870CUEtCU0XKkNLq1oWBjd3EnNbTNWcUUBUtGwwYl TX5YFFSuP/k9AWSS8fzDarenpDFzuyWPYNcNOCEq6PwyLXv4SwOXi7dxQhLfUYsXDgVd pmCJiJ6gWlv8lKEq4x0yWKJrb3nTxtLdbRxsKo/lp/0Nsra1DPga7OC1crpA7D1kH57T Dm0nzfGkEV+6p1hqeCJDUSGpU2JHa8RwHNxQ58N38yq/bQnlowmbpLzouc9/5lI8C606 ZY9g== X-Forwarded-Encrypted: i=1; AKwUvBxoFXNiHKo13XA69eNVp6+NG7qkGQb6oSB7h2siXIpCUdatez72ATjzzddYju7txGgIHFELOMaR/6oMq80=@vger.kernel.org X-Gm-Message-State: AFuF++lnGnzGIILJgWkV2T70KVWlDnObCZjFdEQyjakqE5xYMzrtUvap r7oTkji8OgB0UFkaFpre1LMeRiee/6D3l0nLQOlBQdqNgkBQmLXkWHF9y8HsvLhNLifTXAIIigK YgjG5CByMlltVBAlmWHOAm4tQu/1iRYZX+2Ndp6H6ZrJ6pROTTfVCtpEQKnQ= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:f003:b0:6b7:8415:d790 with SMTP id 006d021491bc7-6c7d3802648mr545705eaf.59.1789511672466; Tue, 15 Sep 2026 15:34:32 -0700 (PDT) Date: Tue, 15 Sep 2026 15:34:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa9c7f8.a211d2ce.1a5198.02b5.GAE@google.com> Subject: [syzbot] [netfilter?] WARNING in nf_flow_table_extend_ct_timeout From: syzbot To: coreteam@netfilter.org, davem@davemloft.net, edumazet@google.com, fw@strlen.de, horms@kernel.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: 50d05c7c76c9 Merge tag 'landlock-7.3-rc3' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14ac428e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5e4e3a0e188a497e dashboard link: https://syzkaller.appspot.com/bug?extid=521f7e7e2b974abde99a compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/daf497619736/disk-50d05c7c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/748fbd82f647/vmlinux-50d05c7c.xz kernel image: https://storage.googleapis.com/syzbot-assets/e61c59099d07/bzImage-50d05c7c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+521f7e7e2b974abde99a@syzkaller.appspotmail.com ------------[ cut here ]------------ 1 WARNING: net/netfilter/nf_flow_table_core.c:546 at nf_flow_table_extend_ct_timeout+0x1ee/0x2f0 net/netfilter/nf_flow_table_core.c:546, CPU#0: kworker/0:2/3335 Modules linked in: CPU: 0 UID: 0 PID: 3335 Comm: kworker/0:2 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/08/2026 Workqueue: events_power_efficient nf_flow_offload_work_gc RIP: 0010:nf_flow_table_extend_ct_timeout+0x1ee/0x2f0 net/netfilter/nf_flow_table_core.c:546 Code: 00 00 00 41 83 ff 06 0f 84 9a 00 00 00 41 83 ff 05 0f 85 b0 00 00 00 e8 70 d1 ab f7 41 bf 30 75 00 00 eb 0f e8 63 d1 ab f7 90 <0f> 0b 90 41 bf 01 00 00 00 48 c7 c0 80 f2 a0 8e 48 c1 e8 03 42 80 RSP: 0000:ffffc900040ff938 EFLAGS: 00010293 RAX: ffffffff8a1bf92d RBX: ffff88807da5be00 RCX: ffff88803247ddc0 RDX: 0000000000000000 RSI: ffffffff902f6960 RDI: 000000000000002f RBP: 0000000000039e60 R08: ffff88803247ddc0 R09: 0000000000000002 R10: 0000000000000011 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff1100fb4b7d8 R14: ffff88807da5be48 R15: 000000000000002f FS: 0000000000000000(0000) GS:ffff888124cd2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f7238c10 CR3: 000000007a894000 CR4: 00000000003526f0 DR0: ffffffffffffffff DR1: 00000000000001f7 DR2: 00000000ffffffff DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: nf_flow_offload_gc_step+0x545/0x7b0 net/netfilter/nf_flow_table_core.c:581 nf_flow_table_iterate+0x13c/0x1f0 net/netfilter/nf_flow_table_core.c:452 nf_flow_table_gc_run net/netfilter/nf_flow_table_core.c:604 [inline] nf_flow_offload_work_gc+0x22/0x70 net/netfilter/nf_flow_table_core.c:612 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 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