------------[ cut here ]------------
WARNING: CPU: 0 PID: 8000 at net/ipv4/route.c:1270 ip_rt_bug+0x2c/0x110 net/ipv4/route.c:1270
Modules linked in:
CPU: 0 UID: 0 PID: 8000 Comm: syz.4.528 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:ip_rt_bug+0x2c/0x110 net/ipv4/route.c:1270
Code: 1e fa 41 57 41 56 41 55 41 54 53 48 89 d3 e8 8b dd 08 f8 66 90 e8 84 dd 08 f8 31 ff 48 89 de ba 02 00 00 00 e8 d5 0d 6f ff 90 <0f> 0b 90 31 c0 5b 41 5c 41 5d 41 5e 41 5f e9 11 9e 97 01 cc f3 0f
RSP: 0018:ffffc9000aa5f180 EFLAGS: 00010286
RAX: 82ba90dfab6e2d00 RBX: ffff888078ae4280 RCX: 82ba90dfab6e2d00
RDX: 0000000000000002 RSI: ffffffff8d7e845f RDI: ffffffff8bc077e0
RBP: 0000000000000001 R08: ffffffff8f9e1377 R09: 1ffffffff1f3c26e
R10: dffffc0000000000 R11: fffffbfff1f3c26f R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888078ae4280 R15: ffff888020ab9e00
FS:  00007fafe98636c0(0000) GS:ffff888125d0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3d4f8f CR3: 0000000028b06000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ip_local_out net/ipv4/ip_output.c:131 [inline]
 ip_send_skb net/ipv4/ip_output.c:1508 [inline]
 ip_push_pending_frames+0xbe/0x150 net/ipv4/ip_output.c:1528
 __icmp_send+0xfc3/0x1320 net/ipv4/icmp.c:787
 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:288 [inline]
 ip_rcv_finish_core+0xaa2/0x1c00 net/ipv4/ip_input.c:391
 ip_rcv_finish+0x14c/0x2f0 net/ipv4/ip_input.c:451
 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318
 __netif_receive_skb_one_core net/core/dev.c:6079 [inline]
 __netif_receive_skb+0x143/0x380 net/core/dev.c:6192
 netif_receive_skb_internal net/core/dev.c:6278 [inline]
 netif_receive_skb+0x1cb/0x790 net/core/dev.c:6337
 tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485
 tun_get_user+0x2b65/0x3e90 drivers/net/tun.c:1953
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 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/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fafe898da7f
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:00007fafe9863000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fafe8be5fa0 RCX: 00007fafe898da7f
RDX: 000000000000006e RSI: 00002000000007c0 RDI: 00000000000000c8
RBP: 00007fafe8a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000006e R11: 0000000000000293 R12: 0000000000000000
R13: 00007fafe8be6038 R14: 00007fafe8be5fa0 R15: 00007fffe83b82d8
 </TASK>