------------[ cut here ]------------ 1 WARNING: net/ipv4/route.c:1275 at ip_rt_bug+0x2d/0x140 net/ipv4/route.c:1275, CPU#0: syz.2.4276/23491 Modules linked in: CPU: 0 UID: 0 PID: 23491 Comm: syz.2.4276 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 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 6a 32 b7 f7 66 90 e8 63 32 b7 f7 31 ff 48 89 de ba 02 00 00 00 e8 e4 0d 69 ff 90 <0f> 0b 90 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 49 RSP: 0018:ffffc90006e46ac0 EFLAGS: 00010286 RAX: cda8d879d1ad3900 RBX: ffff88802be3edc0 RCX: 0000000000000401 RDX: 0000000000000002 RSI: ffffffff8dfb685b RDI: ffffffff8c27f080 RBP: ffffc90006e46db0 R08: ffffffff903216b7 R09: 1ffffffff20642d6 R10: dffffc0000000000 R11: fffffbfff20642d7 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88802be3edc0 R15: dffffc0000000000 FS: 00007fcbcf4216c0(0000) GS:ffff888125245000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000010000 CR3: 000000006b23e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: ip_send_skb net/ipv4/ip_output.c:1508 [inline] ip_push_pending_frames+0x8b/0x110 net/ipv4/ip_output.c:1528 __icmp_send+0x11e4/0x1690 net/ipv4/icmp.c:997 ipv4_send_dest_unreach net/ipv4/route.c:1255 [inline] ipv4_link_failure+0x66c/0xa70 net/ipv4/route.c:1262 dst_link_failure include/net/dst.h:438 [inline] vti_xmit net/ipv4/ip_vti.c:271 [inline] vti_tunnel_xmit+0x10a4/0x1a00 net/ipv4/ip_vti.c:307 __netdev_start_xmit include/linux/netdevice.h:5343 [inline] netdev_start_xmit include/linux/netdevice.h:5352 [inline] xmit_one net/core/dev.c:3888 [inline] dev_hard_start_xmit+0x2cd/0x830 net/core/dev.c:3904 __dev_queue_xmit+0x14d9/0x3950 net/core/dev.c:4870 neigh_output include/net/neighbour.h:556 [inline] ip_finish_output2+0xca9/0x1070 net/ipv4/ip_output.c:237 ip_do_fragment+0x1121/0x1770 net/ipv4/ip_output.c:859 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0x29f/0x450 net/ipv4/ip_output.c:438 ip_send_skb+0x45/0xc0 net/ipv4/ip_output.c:1508 udp_send_skb+0x7e4/0xf70 net/ipv4/udp.c:1161 udp_sendmsg+0x1937/0x21a0 net/ipv4/udp.c:1443 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] ____sys_sendmsg+0x80a/0x9f0 net/socket.c:2698 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752 __sys_sendmsg net/socket.c:2784 [inline] __do_sys_sendmsg net/socket.c:2789 [inline] __se_sys_sendmsg net/socket.c:2787 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787 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: 0033:0x7fcbce59c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcbcf421028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fcbce815fa0 RCX: 00007fcbce59c819 RDX: 0000000000000000 RSI: 0000200000007940 RDI: 0000000000000007 RBP: 00007fcbce632c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcbce816038 R14: 00007fcbce815fa0 R15: 00007ffed3ba6f38