From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f69.google.com (mail-oo1-f69.google.com [209.85.161.69]) (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 5B82F1E3DED for ; Fri, 27 Feb 2026 13:18:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772198285; cv=none; b=G5vaiF6DScvrWHu/F8uv92jGoXuZEBnsDuB9xi5UlG8M2RPyqf7cdnW8H8dnRHLtdG6jjNqWiiK5I/mt5JuEP/1VB5fEZO2AXFQYagr12uVKwTCfTTTJOGNV+oAtn/ATSmYsH9AWvWuJbvDmpTy0EYEpVSStQvJRqn5bWq8UcRg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772198285; c=relaxed/simple; bh=aRtKwaBgSUvip5O964Mbc1tBOP7XrY7KIMg8SwW/ecM=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=L1WMlw3ZaTaO6UV0BmOSs/PKpDFOE/F84HVedw3+UI+QAd14MnHkZpmzk3T23Ub80qpOEvAWu5hWMLwnB7gPWDz6uyJO6HlC/xIOZ8+z99vnAN5T3x/pQRndY0Jn0oHc2gGnuZUw8CViM6740MCsIfv/VDlp1+2laVCjwUPL/64= 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=209.85.161.69 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-f69.google.com with SMTP id 006d021491bc7-679deba5e9fso276546eaf.0 for ; Fri, 27 Feb 2026 05:18:04 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772198283; x=1772803083; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=qnzf4msCrXcQOCCQQVSAQqz1IQDz7nuDgeGP80cqMgQ=; b=rnmUXIM8zpwrUdlCY4y6AhrA7ISI8rh3aHVF1LDRMod3lefO6ZmZ3fsfIMjgvx65QY zj6JgAQwjhKMuMFXGtcLueyPl1UAmXWGIaBKZzhvtWEsDLUQpR6J2C/FSqf3dxDKrqiU Eb3F1S9Rk9oMyI5+v7Sx6N/DUSFOeg4MpFfIJ6EWi+KDDIJ+tvxkBazOTJj+KIhzk2aQ kZUdhoHcYL8KFKJ29gMzD5bXJDVA5jCOSWY23hjwEOey7DPPTPKNw5Ipc20/Kvkil/1s uQlKtcVXC8y4XJFdVL+56EEPD4jczhpfodV4gomdBvlq1SjYvM2VgEFCD1wNCgcpHLxh 3qNg== X-Gm-Message-State: AOJu0YwQA73hfsK/1G12iTeZOkgrTzGxNVMBW4/SRJ16JG+uuFUmxChZ dPM0xD76TZYxPOklRLdWdXTY7moM1TXgy1ztnkKeGuKNdg6yu15UnMOBEbkiNAsP18Lw/TxjrMy xyp34q6fNfT6QZN3MOCctBcBH2chV3ORA+H1nHGHXVvo77dELT+Z8daCl4qM= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:208a:b0:677:8da:2861 with SMTP id 006d021491bc7-679faefed09mr1795661eaf.38.1772198283353; Fri, 27 Feb 2026 05:18:03 -0800 (PST) Date: Fri, 27 Feb 2026 05:18:03 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69a1998b.050a0220.3a55be.001f.GAE@google.com> Subject: Re: [syzbot] [netfilter?] WARNING in __nf_unregister_net_hook (9) From: syzbot To: linux-kernel@vger.kernel.org, phil@nwl.cc, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in __nf_unregister_net_hook ------------[ cut here ]------------ hook not found, pf 5 num 0 WARNING: net/netfilter/core.c:514 at __nf_unregister_net_hook+0x2c5/0x6f0 net/netfilter/core.c:514, CPU#1: syz.1.1035/9919 Modules linked in: CPU: 1 UID: 0 PID: 9919 Comm: syz.1.1035 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__nf_unregister_net_hook+0x2dc/0x6f0 net/netfilter/core.c:514 Code: 24 30 48 8b 5c 24 08 44 8b 6c 24 04 48 8d 3d fb 0b 5b 06 48 8b 44 24 10 0f b6 04 28 84 c0 0f 85 f1 02 00 00 41 8b 17 44 89 ee <67> 48 0f b9 3a e9 db 01 00 00 e8 55 38 e7 01 89 c3 31 ff 89 c6 e8 RSP: 0018:ffffc9000556eb30 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888032313d80 RCX: ffff888030ae9e40 RDX: 0000000000000000 RSI: 0000000000000005 RDI: ffffffff9020ab80 RBP: dffffc0000000000 R08: ffffffff901188b7 R09: 1ffffffff2023116 R10: dffffc0000000000 R11: fffffbfff2023117 R12: ffff88807ec62640 R13: 0000000000000005 R14: ffff88802a210490 R15: ffff88807dfd2cbc FS: 00007fcd31fca6c0(0000) GS:ffff888125567000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2dc0fe8600 CR3: 000000007e876000 CR4: 00000000003526f0 Call Trace: nft_unregister_flowtable_ops net/netfilter/nf_tables_api.c:8834 [inline] nft_flowtable_event net/netfilter/nf_tables_api.c:9613 [inline] __nf_tables_flowtable_event+0x5bf/0x8c0 net/netfilter/nf_tables_api.c:9658 nf_tables_flowtable_event+0x103/0x160 net/netfilter/nf_tables_api.c:9689 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] unregister_netdevice_many_notify+0x186a/0x2370 net/core/dev.c:12412 rtnl_newlink_create+0x84b/0xb70 net/core/rtnetlink.c:3868 __rtnl_newlink net/core/rtnetlink.c:3957 [inline] rtnl_newlink+0x1666/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcd3119aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcd31fca028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fcd31415fa0 RCX: 00007fcd3119aeb9 RDX: 0000000000000000 RSI: 0000200000000200 RDI: 0000000000000003 RBP: 00007fcd31208c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcd31416038 R14: 00007fcd31415fa0 R15: 00007ffc25796e58 ---------------- Code disassembly (best guess): 0: 24 30 and $0x30,%al 2: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx 7: 44 8b 6c 24 04 mov 0x4(%rsp),%r13d c: 48 8d 3d fb 0b 5b 06 lea 0x65b0bfb(%rip),%rdi # 0x65b0c0e 13: 48 8b 44 24 10 mov 0x10(%rsp),%rax 18: 0f b6 04 28 movzbl (%rax,%rbp,1),%eax 1c: 84 c0 test %al,%al 1e: 0f 85 f1 02 00 00 jne 0x315 24: 41 8b 17 mov (%r15),%edx 27: 44 89 ee mov %r13d,%esi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 db 01 00 00 jmp 0x20f 34: e8 55 38 e7 01 call 0x1e7388e 39: 89 c3 mov %eax,%ebx 3b: 31 ff xor %edi,%edi 3d: 89 c6 mov %eax,%esi 3f: e8 .byte 0xe8 Tested on: commit: fd6dad4e netmem: remove the pp fields from net_iov git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=1449a8d6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=75b1f89e973ee407 dashboard link: https://syzkaller.appspot.com/bug?extid=78ac1e46d2966eb70fda compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Note: no patches were applied.