skb linear:   00000100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
skb linear:   00000110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
skb linear:   00000120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
------------[ cut here ]------------
offset+2 (1706) > skb_headlen() (1672)
WARNING: CPU: 0 PID: 5050 at net/core/dev.c:3302 skb_checksum_help+0x6b1/0x740 net/core/dev.c:3301
Modules linked in:
CPU: 0 PID: 5050 Comm: syz-executor413 Not tainted 6.6.0-syzkaller-05843-g89ed67ef126c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:skb_checksum_help+0x6b1/0x740 net/core/dev.c:3301
Code: ff df 48 8b 4c 24 18 0f b6 04 01 84 c0 0f 85 83 00 00 00 48 8b 04 24 2b 18 48 c7 c7 e0 4f 3b 8c 4c 89 fe 89 da e8 8f 60 60 f8 <0f> 0b bb ea ff ff ff e9 d1 fc ff ff 44 89 e9 80 e1 07 80 c1 03 38
RSP: 0018:ffffc90003d1eee8 EFLAGS: 00010246
RAX: 3e3f6d924ae57c00 RBX: 0000000000000688 RCX: ffff8880241cbb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff815490c2 R09: 1ffff920007a3d30
R10: dffffc0000000000 R11: fffff520007a3d31 R12: 0000000000000000
R13: 00000000000006a8 R14: ffff88807861cc80 R15: 00000000000006aa
FS:  0000555556cf4380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 0000000075b92000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip_do_fragment+0x21a/0x1b00 net/ipv4/ip_output.c:777
 ip_finish_output_gso net/ipv4/ip_output.c:286 [inline]
 __ip_finish_output+0x2bd/0x4b0 net/ipv4/ip_output.c:308
 iptunnel_xmit+0x540/0x9b0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x20d8/0x2940 net/ipv4/ip_tunnel.c:831
 __gre_xmit net/ipv4/ip_gre.c:469 [inline]
 ipgre_xmit+0x757/0xa50 net/ipv4/ip_gre.c:662
 __netdev_start_xmit include/linux/netdevice.h:4918 [inline]
 netdev_start_xmit include/linux/netdevice.h:4932 [inline]
 xmit_one net/core/dev.c:3543 [inline]
 dev_hard_start_xmit+0x241/0x750 net/core/dev.c:3559
 __dev_queue_xmit+0x19d0/0x3a30 net/core/dev.c:4344
 packet_snd net/packet/af_packet.c:3087 [inline]
 packet_sendmsg+0x47e8/0x6240 net/packet/af_packet.c:3119
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x592/0x890 net/socket.c:2558
 ___sys_sendmsg net/socket.c:2612 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2641
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fbce18a1499
Code: 48 83 c4 28 c3 e8 d7 19 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd012718d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbce18ee390 RCX: 00007fbce18a1499
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000555500000000 R09: 0000555500000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007ffd01271920
R13: 00007ffd012718f0 R14: 0000000000000001 R15: 00007ffd01271920
 </TASK>