------------[ cut here ]------------
WARNING: CPU: 0 PID: 6856 at net/ipv4/route.c:1266 ip_rt_bug+0x2c/0x110 net/ipv4/route.c:1266
Modules linked in:
CPU: 0 UID: 0 PID: 6856 Comm: syz.1.261 Not tainted 6.16.0-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:ip_rt_bug+0x2c/0x110 net/ipv4/route.c:1266
Code: 1e fa 41 57 41 56 41 55 41 54 53 48 89 d3 e8 1b 3c ea f7 66 90 e8 14 3c ea f7 31 ff 48 89 de ba 02 00 00 00 e8 c5 8f 70 ff 90 <0f> 0b 90 31 c0 5b 41 5c 41 5d 41 5e 41 5f e9 51 79 93 01 cc f3 0f
RSP: 0018:ffffc9000b5df1a0 EFLAGS: 00010282
RAX: 485099b9771f5800 RBX: ffff88807d343a00 RCX: 485099b9771f5800
RDX: 0000000000000002 RSI: ffffffff8d982fba RDI: ffffffff8be1ba40
RBP: 0000000000000001 R08: ffffffff8fa0b3f7 R09: 1ffffffff1f4167e
R10: dffffc0000000000 R11: fffffbfff1f4167f R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88807d343a00 R15: ffff8880226d1b00
FS:  00007f21c0f816c0(0000) GS:ffff888125c57000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c351eb9 CR3: 00000000303a2000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ip_local_out net/ipv4/ip_output.c:129 [inline]
 ip_send_skb net/ipv4/ip_output.c:1502 [inline]
 ip_push_pending_frames+0xbe/0x150 net/ipv4/ip_output.c:1522
 __icmp_send+0xf87/0x12d0 net/ipv4/icmp.c:781
 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:281 [inline]
 ip_rcv_finish_core+0xaa2/0x1c00 net/ipv4/ip_input.c:388
 ip_rcv_finish+0x14c/0x2f0 net/ipv4/ip_input.c:446
 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:317
 __netif_receive_skb_one_core net/core/dev.c:5977 [inline]
 __netif_receive_skb+0x143/0x380 net/core/dev.c:6090
 netif_receive_skb_internal net/core/dev.c:6176 [inline]
 netif_receive_skb+0x1cb/0x790 net/core/dev.c:6235
 tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485
 tun_get_user+0x298e/0x3ce0 drivers/net/tun.c:1938
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1984
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x54b/0xa90 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f21c018d69f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f21c0f81000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f21c03b5fa0 RCX: 00007f21c018d69f
RDX: 0000000000000046 RSI: 0000200000000400 RDI: 00000000000000c8
RBP: 00007f21c0211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000046 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f21c03b6038 R14: 00007f21c03b5fa0 R15: 00007ffc8da89d48
 </TASK>