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 A748F361975 for ; Sat, 12 Sep 2026 23:39:25 +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=1789256367; cv=none; b=kWvDbtjMIE/MxZ/OcMEGdq8eJfOYJWtG1IJD8NCa1n+XD+fqfLiG8L0KLazNS/xKBwTMPHvy2eoRAisW25i19/4XYzGGxdLEnq3owSwj3/VQuUfgJN/cXxtZukybzOt6RrVcYiqyLhMk889sRE/10v9BQlmHnVOMueMPulk3X0c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789256367; c=relaxed/simple; bh=CJOvd6ShywdZs1rx7fjJCsC/4XAK4z3X2gQXF3/nugw=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=B+G86rV7omU3lUx8OjPgjxsPmjwqcK9gDgdrZoGZHUdS0jDzghLZB1qcWvtvh2gH0HSP3HjKI6VvIGjQUb6EZKT9JPksw2jypJsD+PEjI8fNO3HYKlc2SAfpD2WFzUPxseFa9KSJSLNXP/m+bJAH0BYhOrWT4Ij/Kqp+CZbZ28A= 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 46e09a7af769-80477cb33a7so621915a34.0 for ; Sat, 12 Sep 2026 16:39:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1789256364; x=1789861164; 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=X+4nm1uFj1dV7vSKZCHtdIxVm+oQk/J5Z2TW7/T4cvs=; b=fO6+8T/DazNH3gHa1EnuQvN8UqnxCnc124egNhTPa709Mj9ftegCzKT2qLsh8+VDCi qpe0Ba7RDQXEA6C+l9pz/O3WGwwqYnEnfUujK/DFUfn3c/PHU4Q2mc9GyFdbJFhT3TDY kkfULWTQ1anBkT8d4rF/5w703v7xW9IC45clgWeEo7q4ges8krvzf0bV9hRbtLNawLlc WeHICHSAFmYZU+nmJtNP/AZ75UirwcmrgQwPtABScRtS+szvwzHPxzAxht9QmpHE7T82 hDjPpSl+pSYkk7y9OYArFbXJlmPO4+NI8elmUSK+FhOTCCzRUEPImUA+6S15E1+4sdEm PaPw== X-Forwarded-Encrypted: i=1; AKwUvBzj4wUdBbydciJdSM0y6TWf3xAHWwnjRtX2JTJWyB2wNjQr6gZTafpcG1Cp1UA5i4XnBaSWb/P9bF8N18E=@vger.kernel.org X-Gm-Message-State: AFuF++lo9RjWPOKmKZYmHGKiV6gsqlFbtPnu/parS+KLB/HEe1FV68tg qGA39itsUgabwowjU/IZ7HOgwS2d3sa/gd870j5Kt+wnDNIYmf8yT4+wXVDBTuNLAcBYFRkJdLn HeRKrWrA7EnUAPHXXBhXzzjk/gn10wjvrwCt3L7YuEyEJ3ykVpJq3qx5eDVA= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:16aa:b0:6c1:e01b:3b1e with SMTP id 006d021491bc7-6c1e01b48b3mr4716143eaf.48.1789256364568; Sat, 12 Sep 2026 16:39:24 -0700 (PDT) Date: Sat, 12 Sep 2026 16:39:24 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa5e2ac.6e6c5f9e.28f11f.0052.GAE@google.com> Subject: [syzbot] [net?] WARNING in tcf_ct_flow_table_process_conn From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 5225b8eec4c9 mailmap: update entry for Jens Axboe git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=165795f9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5e4e3a0e188a497e dashboard link: https://syzkaller.appspot.com/bug?extid=6cc37aba98dac721c415 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8ec9ac0f583a/disk-5225b8ee.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ba864b419b40/vmlinux-5225b8ee.xz kernel image: https://storage.googleapis.com/syzbot-assets/ddacae1aa6db/bzImage-5225b8ee.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6cc37aba98dac721c415@syzkaller.appspotmail.com ------------[ cut here ]------------ 1 WARNING: net/sched/act_ct.c:437 at tcf_ct_flow_table_add net/sched/act_ct.c:437 [inline], CPU#0: ksoftirqd/0/15 WARNING: net/sched/act_ct.c:437 at tcf_ct_flow_table_process_conn+0x449/0x7c0 net/sched/act_ct.c:513, CPU#0: ksoftirqd/0/15 Modules linked in: CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:tcf_ct_flow_table_add net/sched/act_ct.c:437 [inline] RIP: 0010:tcf_ct_flow_table_process_conn+0x449/0x7c0 net/sched/act_ct.c:513 Code: 85 81 02 00 00 41 0f b7 2f 31 ff 89 ee e8 6f b1 e9 f7 85 ed 0f 84 7c 01 00 00 e8 22 ad e9 f7 e9 e0 01 00 00 e8 18 ad e9 f7 90 <0f> 0b 90 e9 b2 01 00 00 e8 0a ad e9 f7 4d 89 f7 40 84 ed 74 27 e8 RSP: 0018:ffffc900001471d8 EFLAGS: 00010246 RAX: ffffffff89de1d98 RBX: ffff8880774aa000 RCX: ffff88801e299f40 RDX: 8000000000000100 RSI: 0000000000000100 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000100 R09: 1ffff1100ee95418 R10: dffffc0000000000 R11: ffffed100ee95419 R12: dffffc0000000000 R13: 1ffff1100ee9541e R14: ffff8880774aa0c0 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124cd2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f40fd23ffd0 CR3: 0000000028424000 CR4: 00000000003526f0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: tcf_ct_act+0x2a75/0x4050 net/sched/act_ct.c:1123 tc_act include/net/tc_wrapper.h:131 [inline] tcf_action_exec+0x185/0x8d0 net/sched/act_api.c:1162 tcf_exts_exec include/net/pkt_cls.h:361 [inline] basic_classify+0x1b2/0x2d0 net/sched/cls_basic.c:54 tc_classify include/net/tc_wrapper.h:198 [inline] __tcf_classify net/sched/cls_api.c:1779 [inline] tcf_classify+0x43d/0x1160 net/sched/cls_api.c:1875 tc_run+0x42d/0x750 net/core/dev.c:4463 sch_handle_ingress net/core/dev.c:4538 [inline] __netif_receive_skb_core+0x1443/0x30c0 net/core/dev.c:6115 __netif_receive_skb_one_core net/core/dev.c:6262 [inline] __netif_receive_skb net/core/dev.c:6377 [inline] process_backlog+0x727/0x18b0 net/core/dev.c:6728 __napi_poll+0xaa/0x330 net/core/dev.c:7787 napi_poll net/core/dev.c:7850 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:8007 handle_softirqs+0x226/0x860 kernel/softirq.c:645 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1099 smpboot_thread_fn+0x565/0xa70 kernel/smpboot.c:160 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