skb linear:   000000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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 (4191) > skb_headlen() (1116)
WARNING: CPU: 0 PID: 5080 at net/core/dev.c:3287 skb_checksum_help+0x68f/0x730 net/core/dev.c:3286
Modules linked in:
CPU: 0 PID: 5080 Comm: syz-executor291 Not tainted 6.8.0-syzkaller-05202-g9187210eee7d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:skb_checksum_help+0x68f/0x730 net/core/dev.c:3286
Code: 48 8b 4c 24 10 0f b6 04 01 84 c0 0f 85 89 00 00 00 48 8b 44 24 08 2b 18 48 c7 c7 20 f3 9f 8c 4c 89 f6 89 da e8 e2 4d 12 f8 90 <0f> 0b 90 90 bb ea ff ff ff e9 cf fc ff ff 48 8b 0c 24 80 e1 07 80
RSP: 0018:ffffc90003baf108 EFLAGS: 00010246
RAX: 1441f12fa9d8fb00 RBX: 000000000000045c RCX: ffff888021945a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8157cc12 R09: 1ffff92000775dc0
R10: dffffc0000000000 R11: fffff52000775dc1 R12: 1ffff1100554019e
R13: 000000000000105d R14: 000000000000105f R15: ffff88802aa00c80
FS:  0000555557368380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 000000002b47a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ip_do_fragment+0x21b/0x1b60 net/ipv4/ip_output.c:777
 ip_finish_output_gso net/ipv4/ip_output.c:286 [inline]
 __ip_finish_output+0x290/0x400 net/ipv4/ip_output.c:308
 iptunnel_xmit+0x540/0x9b0 net/ipv4/ip_tunnel_core.c:82
 ipip6_tunnel_xmit net/ipv6/sit.c:1034 [inline]
 sit_tunnel_xmit+0x1b7b/0x25b0 net/ipv6/sit.c:1076
 __netdev_start_xmit include/linux/netdevice.h:4903 [inline]
 netdev_start_xmit include/linux/netdevice.h:4917 [inline]
 xmit_one net/core/dev.c:3531 [inline]
 dev_hard_start_xmit+0x26c/0x790 net/core/dev.c:3547
 __dev_queue_xmit+0x19f4/0x3b10 net/core/dev.c:4335
 packet_snd net/packet/af_packet.c:3083 [inline]
 packet_sendmsg+0x4932/0x63d0 net/packet/af_packet.c:3115
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x223/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191
 __do_sys_sendto net/socket.c:2203 [inline]
 __se_sys_sendto net/socket.c:2199 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2199
 do_syscall_64+0xfd/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f34db794e69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 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:00007fffd9c34bd8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f34db794e69
RDX: 000000000000fc13 RSI: 0000000020000280 RDI: 0000000000000006
RBP: 00000000000f4240 R08: 0000000000000000 R09: 000000000000002f
R10: 0000000000000800 R11: 0000000000000246 R12: 00007fffd9c34c40
R13: 00000000000135d9 R14: 00007fffd9c34c0c R15: 0000000000000003
 </TASK>