From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f198.google.com (mail-oi1-f198.google.com [209.85.167.198]) (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 4191F37475D for ; Sat, 26 Sep 2026 18:23:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790447015; cv=none; b=osIToQimxYuTKMn59ZnIzdLv4EL2FbPJAMpJu1hoDxCcTvoLg0w3n0nLDkqxY30OTdnWI8tYrT/GTEX5T4uXKAFObW+0MDjScjpZX98Je7T+xLtwzggrcKH7yRIBGvDBGKjYti7NQZZ/nNxO28/jyHPeXVyaC57CpUiejjkZpMc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790447015; c=relaxed/simple; bh=qfALQe90TeUnY37aQVtdHFc4lNsDWUqSJvSQILWWHpo=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=r6ME0MxzPgFMeQPnWP13jLlSATET0gerlhIiwJHwXFVQqNoDYVpx4iw38rluNVhf2IHZM8xwh/edqyPinEKDvjuiSQ7ghrKtB+ypnqsn9SPpgbF2Z90t5GFhZZ5+tt67FmOhP0+p7wTTtksbF0dodhXOlCJjgteo817QRcMk0FA= 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=209.85.167.198 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-oi1-f198.google.com with SMTP id 5614622812f47-4b2f2b8d88fso3267587b6e.2 for ; Sat, 26 Sep 2026 11:23:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790447012; x=1791051812; 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=InOuP8c6dtBIwm2Fjbz4yA5MQ5gnJ6A4TGBGUZFZG+w=; b=DGr7W16pjx+dUQjW0zQH34YuZjbDxd4r7w0wNW9iSTmTvAJ1k5nW1bfyDCojLbSZDg 60BKz9Nr3qUCoGfkvtwSmSuohuRV1C6X/guiNmcjtmM8CaYF7QuIWSJ8tOvApeiMRIT7 tux6Ygz4SKFtELhF/uWGdQd6+ux4DrOJnUIP+OtFXev4/Ta4W+Vaw2QVT+7T1VK2krC6 V3gNw6FbB5Ua85CWuoflmIoksIDi6El2QQRpBBaNqNUKX9j+fzrBaC2ebWGwUE18BTwL JDLpdmpJU47h9A8OAVrtlBPEeHCp5LLfheIwT3t/0LyqNTTIQKTjHjPFTtwSukPhrpzZ 59Og== X-Forwarded-Encrypted: i=1; AKwUvBxVntvtJSe0c6x8RDwDljQcE+b5bpOKYBwVEDX88QLj6Ymb7gGHS5KDiLfIrmbmrqOxCb4GJbpX0nXkSC4=@vger.kernel.org X-Gm-Message-State: AFuF++mVoK8Oe8ZSKEXMFiITdIKo9Fuv8oNpa1EhL1aCOgEebRiGpqv8 2naoY7WXUmGW1AD44ae0Ctl08B59OopCYZquKMxkmexIHceaIhHMIwVhxtS3rF2w4mfh2QN1AtX nRQ47JnU66LnDYU2DsjBbNvuqvkXFto2xeZhI8yMR7FNo3TtjokZvE9bsWOc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:190d:b0:4c1:e6f4:f2c5 with SMTP id 5614622812f47-4d728c29dadmr10660539b6e.2.1790447012256; Sat, 26 Sep 2026 11:23:32 -0700 (PDT) Date: Sat, 26 Sep 2026 11:23:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab80da4.e548f532.1ca396.0032.GAE@google.com> Subject: [syzbot] [netfilter?] kernel BUG in nf_ip6_checksum 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: eabc76156e86 Merge branch 'net-dsa-mv88e6xxx-ethtool-n-tup.. git tree: net-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=102d1405580000 kernel config: https://syzkaller.appspot.com/x/.config?x=7a013aa2165022bf dashboard link: https://syzkaller.appspot.com/bug?extid=5a8667f002726fc59f88 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=122d1405580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c58c5e580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1d4c5734556a/disk-eabc7615.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5c68f2f68d0d/vmlinux-eabc7615.xz kernel image: https://storage.googleapis.com/syzbot-assets/f4fc253f3897/bzImage-eabc7615.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5a8667f002726fc59f88@syzkaller.appspotmail.com ip6_tables: ip6tables: counters copy to user failed while replacing table ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:3606! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 5631 Comm: syz-executor206 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:skb_checksum+0x8b2/0x8c0 net/core/skbuff.c:3606 Code: c4 3d 8c f8 e9 43 f9 ff ff 44 89 f9 80 e1 07 38 c1 0f 8c 59 f9 ff ff 4c 89 ff e8 49 3d 8c f8 e9 4c f9 ff ff e8 ef 35 1c f8 90 <0f> 0b 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90003a3f000 EFLAGS: 00010293 RAX: ffffffff89ab9c91 RBX: 000000000000053c RCX: ffff88807f8abe80 RDX: 0000000000000000 RSI: 000000000000053c RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffff88807f8abe80 R09: 0000000000000002 R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000 R13: 000000000000003c R14: 000000000000003c R15: 0000000000000578 FS: 0000555590f26400(0000) GS:ffff888124cca000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556b4bcc5000 CR3: 000000006f904000 CR4: 00000000003526f0 Call Trace: nf_ip6_checksum+0x1bd/0x320 net/netfilter/utils.c:89 synproxy_tg6+0x1a4/0x6e0 net/ipv6/netfilter/ip6t_SYNPROXY.c:21 ip6t_do_table+0xd37/0x15b0 net/ipv6/netfilter/ip6_tables.c:366 nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline] nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619 nf_hook include/linux/netfilter.h:280 [inline] NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:323 ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:545 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325 __netif_receive_skb_one_core net/core/dev.c:6264 [inline] __netif_receive_skb net/core/dev.c:6377 [inline] netif_receive_skb_internal net/core/dev.c:6463 [inline] netif_receive_skb+0x278/0xbf0 net/core/dev.c:6522 tun_rx_batched+0x1de/0x790 drivers/net/tun.c:1571 tun_get_user+0x2be0/0x44d0 drivers/net/tun.c:2045 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:2091 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f993fdff367 Code: 48 89 fa 4c 89 df e8 78 1e 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffcd131e8b0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000555590f26400 RCX: 00007f993fdff367 RDX: 000000000000004a RSI: 0000200000000500 RDI: 00000000000000c8 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f993fe6ebe0 R15: 0000000000000002 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_checksum+0x8b2/0x8c0 net/core/skbuff.c:3606 Code: c4 3d 8c f8 e9 43 f9 ff ff 44 89 f9 80 e1 07 38 c1 0f 8c 59 f9 ff ff 4c 89 ff e8 49 3d 8c f8 e9 4c f9 ff ff e8 ef 35 1c f8 90 <0f> 0b 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90003a3f000 EFLAGS: 00010293 RAX: ffffffff89ab9c91 RBX: 000000000000053c RCX: ffff88807f8abe80 RDX: 0000000000000000 RSI: 000000000000053c RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffff88807f8abe80 R09: 0000000000000002 R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000 R13: 000000000000003c R14: 000000000000003c R15: 0000000000000578 FS: 0000555590f26400(0000) GS:ffff888124cca000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556b4bcc5000 CR3: 000000006f904000 CR4: 00000000003526f0 --- 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 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. 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