From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f205.google.com (mail-il1-f205.google.com [209.85.166.205]) (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 B704944C63 for ; Mon, 1 Dec 2025 02:32:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764556348; cv=none; b=KWZQQ9jrKI0R3OYFGbs8sggc4ydfjLHZ2N/2xlil/q4D5SK6dh2QJN6c27zbXbekZZEcfsIW8U0JWECGFPIECOkBUHp0Qdv4XyM3r6iM1KsJbXY83sqgaQNwvSpyjZM6/nuo3jelm87lI4qrL7BY0rmFOqh71eWRL/VukdCW3WU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764556348; c=relaxed/simple; bh=i+kwUzgEmc26CQBw7pdjwReX7JrLVaeG6NmqYHHo7hA=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=pqUYRTSU8+VloRpWy2yM0ilLi4vuZmjogiFAneQzFtmSAqKb+dairvXvdV15myLWvwR2hOzaN5I6jYjNLo9GsqaW9/DStX9HzcgsAMgz7eaQKooJB1L6ZbWsUnC2sTxP9T0xaRaZrv0fehQXKq8g76ffCa/+Tv/cpfvpeIEsNI8= 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=209.85.166.205 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-il1-f205.google.com with SMTP id e9e14a558f8ab-43322b98837so36314815ab.2 for ; Sun, 30 Nov 2025 18:32:26 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764556346; x=1765161146; 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=B0Aa7TmcvGyNIx9pldfhA8GwF9CpERVegDJ3Pj1q1Og=; b=VCX8pvFZ+oiGZFqT49hNx73UZD0qgRQYtaN9X4d701DgfvSzH6IS8l996gELU9/Ajk By5ZhdMUqsaHgoHMNtrY3xl6t72FKdS5WsTljbWEx11Dwq9i5v9t/3/L7+czM+HpWO3v ZPHuF1DImwhUBbj29DZJvbmFcZTYIc6G/zfjLw/CDJ8ouw6kSkvtWkVyVADcJBxMQy1Z o7VDOBgNBRmErmV9Sv1HmnyY1puYpCE8z9gtriO4XMr3Gi7YoUspl6vSs8YB8YDD/CVp 60yatE6BnLRsRYTdZmZMV38zt36QcnLUoTGrtQxuAiJ+Q9m7C7RVY05xzs9fp0VdzDqJ 7N/A== X-Forwarded-Encrypted: i=1; AJvYcCWTdoFlnf7Ua4cUjaRDLp5ygfE1wBNQUquLI2PX994lsX01xo2qgOWSAwWgARVZLFOOIZQn8IgiEmn4sao=@vger.kernel.org X-Gm-Message-State: AOJu0YzxMW9Gjfs4gokshaxBViD2BVW5LP8P94xcAdvFiQYWez0kB8kr xlsGBIWQb9JuUoKAZQlBJGPQpqA53mCqu17spUK5vL6s45T/eIj1UzNwzuN8kEq5cR9Z3hDitpP 8tUk6lCgiL9C4ATVgz0f22e+LoqMVblwwu7zQcr8vibsFXoqpmX9nbOTJoYY= X-Google-Smtp-Source: AGHT+IGJw7gLZkoJDa2ZuiPEoq8Y1mPuFfG1/Td2PnE4zu5oY8Lvhl15V1PriBUqTgQyJNx8v3tIvhP2FR5FzpcAtVDXTlsrcXCh Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a8a:b0:433:7688:a6ea with SMTP id e9e14a558f8ab-435b98d0114mr267060065ab.25.1764556345816; Sun, 30 Nov 2025 18:32:25 -0800 (PST) Date: Sun, 30 Nov 2025 18:32:25 -0800 In-Reply-To: <6918cd88.050a0220.1c914e.0045.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <692cfe39.a70a0220.2ea503.00ac.GAE@google.com> Subject: Re: [syzbot] [net?] kernel BUG in ip6_pol_route (2) From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, 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" syzbot has found a reproducer for the following issue on: HEAD commit: e69c7c175115 Merge tag 'timers_urgent_for_v6.18_rc8' of gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14fe98c2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=38a0c4cddc846161 dashboard link: https://syzkaller.appspot.com/bug?extid=9b35e9bc0951140d13e6 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13ab4192580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12fe98c2580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1ba30df3c7a5/disk-e69c7c17.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/794674f290bd/vmlinux-e69c7c17.xz kernel image: https://storage.googleapis.com/syzbot-assets/872c0363d566/bzImage-e69c7c17.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9b35e9bc0951140d13e6@syzkaller.appspotmail.com ------------[ cut here ]------------ kernel BUG at net/ipv6/route.c:1473! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 6073 Comm: syz.2.34 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:rt6_make_pcpu_route net/ipv6/route.c:1473 [inline] RIP: 0010:ip6_pol_route+0x117d/0x1180 net/ipv6/route.c:2305 Code: aa f8 e9 f4 fa ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 03 fb ff ff 48 89 df e8 9e cf aa f8 e9 f6 fa ff ff e8 64 0d 49 f8 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e RSP: 0018:ffffc9000407f5a0 EFLAGS: 00010293 RAX: ffffffff89759fdc RBX: ffff888126ef4000 RCX: ffff88802ea13c00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000407f6b0 R08: ffffe8ffffd488af R09: 1ffffd1ffffa9115 R10: dffffc0000000000 R11: fffff91ffffa9116 R12: ffff888031da18c0 R13: ffffffff89758fc2 R14: dffffc0000000000 R15: 0000607ed8e548a8 FS: 0000555563d45500(0000) GS:ffff888126ef4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8a8bbe1760 CR3: 0000000031586000 CR4: 00000000003526f0 Call Trace: pol_lookup_func include/net/ip6_fib.h:617 [inline] fib6_rule_lookup+0x1fc/0x6f0 net/ipv6/fib6_rules.c:120 ip6_route_output_flags_noref net/ipv6/route.c:2684 [inline] ip6_route_output_flags+0x364/0x5d0 net/ipv6/route.c:2696 ip6_route_output include/net/ip6_route.h:93 [inline] ip6_dst_lookup_tail+0x1ae/0x1510 net/ipv6/ip6_output.c:1141 ip6_dst_lookup_flow+0x47/0xe0 net/ipv6/ip6_output.c:1272 tcp_v6_connect+0xbdb/0x18a0 net/ipv6/tcp_ipv6.c:281 __inet_stream_connect+0x2ae/0xe70 net/ipv4/af_inet.c:679 inet_stream_connect+0x66/0xa0 net/ipv4/af_inet.c:750 __sys_connect_file net/socket.c:2102 [inline] __sys_connect+0x323/0x450 net/socket.c:2121 __do_sys_connect net/socket.c:2127 [inline] __se_sys_connect net/socket.c:2124 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2124 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7b578bf749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeb60b5268 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f7b57b15fa0 RCX: 00007f7b578bf749 RDX: 000000000000001c RSI: 0000200000000200 RDI: 0000000000000003 RBP: 00007f7b57943f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7b57b15fa0 R14: 00007f7b57b15fa0 R15: 0000000000000003 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:rt6_make_pcpu_route net/ipv6/route.c:1473 [inline] RIP: 0010:ip6_pol_route+0x117d/0x1180 net/ipv6/route.c:2305 Code: aa f8 e9 f4 fa ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 03 fb ff ff 48 89 df e8 9e cf aa f8 e9 f6 fa ff ff e8 64 0d 49 f8 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e RSP: 0018:ffffc9000407f5a0 EFLAGS: 00010293 RAX: ffffffff89759fdc RBX: ffff888126ef4000 RCX: ffff88802ea13c00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000407f6b0 R08: ffffe8ffffd488af R09: 1ffffd1ffffa9115 R10: dffffc0000000000 R11: fffff91ffffa9116 R12: ffff888031da18c0 R13: ffffffff89758fc2 R14: dffffc0000000000 R15: 0000607ed8e548a8 FS: 0000555563d45500(0000) GS:ffff888126ef4000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f53a449f358 CR3: 0000000031586000 CR4: 00000000003526f0 --- 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.