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AJvYcCVFlAW11UHvBLoXo3Z+FcStSAZ/98pNfhEw2+6Cezi0YuktGJG5cp+2udxDJ59BKLTe9JbXw6Q=@vger.kernel.org X-Gm-Message-State: AOJu0YzVhuwIomLBBLmuIs5roYcFs1QAm12sloIT9STyl28nLZFD3Byy 7eCJuy36R891Na8I90aSzDnFGz5XS3QlDO2WsfP9GU4Kv/qWoj3YchMQE/7fSrtQMFrG1Qp5s60 aBFqfHoB0EJ2SXdHmZgv6FB6LX20gzjkpPNNZZI5nfzT/mG7q2ysJrGCwiYg= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4b94:b0:662:fbdd:1adb with SMTP id 006d021491bc7-67b9bc8875emr5077737eaf.25.1772951970585; Sat, 07 Mar 2026 22:39:30 -0800 (PST) Date: Sat, 07 Mar 2026 22:39:30 -0800 In-Reply-To: <695e9924.050a0220.1c677c.0371.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69ad19a2.a70a0220.52840.0001.GAE@google.com> Subject: Re: [syzbot] [netfilter?] WARNING in nf_hook_entry_head (2) 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" syzbot has found a reproducer for the following issue on: HEAD commit: c113d5e32678 Merge branch 'net-spacemit-a-few-error-handli.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=176fca02580000 kernel config: https://syzkaller.appspot.com/x/.config?x=779072223d02a312 dashboard link: https://syzkaller.appspot.com/bug?extid=6f6a1d20567a8d6b2a58 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1457075a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a1a0aa684791/disk-c113d5e3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6d0461aed5ba/vmlinux-c113d5e3.xz kernel image: https://storage.googleapis.com/syzbot-assets/05b26502bb1f/bzImage-c113d5e3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6f6a1d20567a8d6b2a58@syzkaller.appspotmail.com ------------[ cut here ]------------ 1 WARNING: net/netfilter/core.c:329 at nf_hook_entry_head+0x23e/0x2c0 net/netfilter/core.c:329, CPU#1: kworker/u8:6/166 Modules linked in: CPU: 1 UID: 0 PID: 166 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: netns cleanup_net RIP: 0010:nf_hook_entry_head+0x23e/0x2c0 net/netfilter/core.c:329 Code: 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ff e8 ed 82 69 f8 4d 39 37 74 36 e8 43 41 ff f7 90 <0f> 0b 90 31 db 48 89 d8 5b 41 5e 41 5f 5d c3 cc cc cc cc cc e8 29 RSP: 0018:ffffc900030a7820 EFLAGS: 00010293 RAX: ffffffff89c657eb RBX: ffff8880358c4000 RCX: ffff88801f3a3d00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff88801f3a3d00 R09: 0000000000000006 R10: 000000000000000a R11: 0000000000000000 R12: ffff888068070000 R13: 0000000000000005 R14: ffff888068070000 R15: ffff8880358c4108 FS: 0000000000000000(0000) GS:ffff888125561000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5f121e9e80 CR3: 0000000029e2a000 CR4: 00000000003526f0 Call Trace: __nf_unregister_net_hook+0x74/0x6f0 net/netfilter/core.c:491 nft_unregister_flowtable_ops net/netfilter/nf_tables_api.c:8905 [inline] __nft_unregister_flowtable_net_hooks net/netfilter/nf_tables_api.c:8920 [inline] __nft_release_hook net/netfilter/nf_tables_api.c:11904 [inline] __nft_release_hooks net/netfilter/nf_tables_api.c:11918 [inline] nf_tables_pre_exit_net+0x64a/0x900 net/netfilter/nf_tables_api.c:12069 ops_pre_exit_list net/core/net_namespace.c:161 [inline] ops_undo_list+0x187/0x940 net/core/net_namespace.c:234 cleanup_net+0x56b/0x800 net/core/net_namespace.c:704 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.