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AFNElJ9doyvD2vUWoRLPJ0oLG8y5ors2yqFZtSVagIk2kdYAj9NccTeJxWPH1UGbR0e9O2ZdYyqcZeA=@vger.kernel.org X-Gm-Message-State: AOJu0Yy+y/6pb/NCKBeWi50Z1+KUab93rHFcRdFn0Yz2VDb6dBoQRQvm cR/fP2L6vLmjq44MRNiw1o72qWZa0ZbUlDjFXEnGkFpeeoJT4WSgvW4mybioqI9cbUHdUMio7t7 gm/19hPl56wDNLt0VGrT2wf03W8JVbItlx6C+oWLuYoYl/NACjz1dgL7+ZwI= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2982:b0:67e:160c:36ba with SMTP id 006d021491bc7-69c9bfb1664mr12975942eaf.48.1779220841719; Tue, 19 May 2026 13:00:41 -0700 (PDT) Date: Tue, 19 May 2026 13:00:41 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a0cc169.170a0220.1f6c2d.0004.GAE@google.com> Subject: [syzbot] [net?] WARNING in ip_rt_bug (3) From: syzbot To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, idosch@nvidia.com, 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: fcee7d82f27d Merge tag 'net-7.1-rc3' of git://git.kernel.o.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=139c40ec580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4caf64b1ee83dac0 dashboard link: https://syzkaller.appspot.com/bug?extid=c13a57c2639c2c0d03a6 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=15d3e56a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1177bb26580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7b61ce97ed88/disk-fcee7d82.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a3d680659d25/vmlinux-fcee7d82.xz kernel image: https://storage.googleapis.com/syzbot-assets/16070336dc25/bzImage-fcee7d82.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c13a57c2639c2c0d03a6@syzkaller.appspotmail.com ------------[ cut here ]------------ 1 WARNING: net/ipv4/route.c:1275 at ip_rt_bug+0x2d/0x140 net/ipv4/route.c:1275, CPU#1: syz.0.17/5858 Modules linked in: CPU: 1 UID: 0 PID: 5858 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:ip_rt_bug+0x2d/0x140 net/ipv4/route.c:1275 Code: fa 55 41 57 41 56 41 55 41 54 53 48 89 d3 e8 0a fb b8 f7 66 90 e8 03 fb b8 f7 31 ff 48 89 de ba 02 00 00 00 e8 84 81 68 ff 90 <0f> 0b 90 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d e9 0f d3 9e 01 cc 49 RSP: 0018:ffffc900032ef1c0 EFLAGS: 00010286 RAX: f1fcc608b0941b00 RBX: ffff8880750b3000 RCX: 0000000080000401 RDX: 0000000000000002 RSI: ffffffff8dfa6610 RDI: ffffffff8c28ade0 RBP: ffffc900032ef4c0 R08: ffffffff9030adf7 R09: 1ffffffff20615be R10: dffffc0000000000 R11: fffffbfff20615bf R12: dffffc0000000000 R13: 0000000000000000 R14: ffff8880750b3000 R15: dffffc0000000000 FS: 0000555579ced500(0000) GS:ffff88812538d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbd90672700 CR3: 0000000072438000 CR4: 00000000003526f0 Call Trace: ip_send_skb net/ipv4/ip_output.c:1510 [inline] ip_push_pending_frames+0x8b/0x110 net/ipv4/ip_output.c:1530 __icmp_send+0x11e4/0x1690 net/ipv4/icmp.c:1000 icmp_send include/net/icmp.h:43 [inline] ip_options_compile+0x80/0xb0 net/ipv4/ip_options.c:473 ip_rcv_options net/ipv4/ip_input.c:290 [inline] ip_rcv_finish_core+0xaa2/0x1c00 net/ipv4/ip_input.c:430 ip_rcv_finish+0x14c/0x2a0 net/ipv4/ip_input.c:490 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6202 [inline] __netif_receive_skb net/core/dev.c:6315 [inline] netif_receive_skb_internal net/core/dev.c:6401 [inline] netif_receive_skb+0x45b/0xbf0 net/core/dev.c:6460 tun_rx_batched+0x1de/0x790 drivers/net/tun.c:1487 tun_get_user+0x2bbc/0x43e0 drivers/net/tun.c:1955 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:2001 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61d/0xb90 fs/read_write.c:688 ksys_write+0x150/0x270 fs/read_write.c:740 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbd9075d60e Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007ffcba496af8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000555579ced500 RCX: 00007fbd9075d60e RDX: 0000000000000046 RSI: 0000200000000400 RDI: 00000000000000c8 RBP: 00007fbd90832d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbd90a15fac R14: 00007fbd90a15fa0 R15: 00007fbd90a15fa0 --- 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