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 (11601) >= skb_headlen() (11601)
WARNING: CPU: 1 PID: 5068 at net/core/dev.c:3294 skb_checksum_help+0x5f9/0x730 net/core/dev.c:3293
Modules linked in:
CPU: 1 PID: 5068 Comm: syz-executor113 Not tainted 6.8.0-rc7-syzkaller-00238-g005f6f34bd47 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:skb_checksum_help+0x5f9/0x730 net/core/dev.c:3293
Code: 48 8b 4c 24 10 0f b6 04 01 84 c0 0f 85 dd 00 00 00 48 8b 44 24 08 2b 18 48 c7 c7 00 64 9f 8c 44 89 f6 89 da e8 88 d1 18 f8 90 <0f> 0b 90 90 bb ea ff ff ff e9 65 fd ff ff e8 54 c7 54 f8 c6 05 38
RSP: 0018:ffffc90003a4ee48 EFLAGS: 00010246
RAX: 657cad90a6c3e300 RBX: 0000000000002d51 RCX: ffff888027e63b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000002d51 R08: ffffffff81577bb2 R09: 1ffff110172a51a2
R10: dffffc0000000000 R11: ffffed10172a51a3 R12: 1ffff11005b3e65e
R13: dffffc0000000000 R14: 0000000000002d51 R15: ffff88802d9f3280
FS:  0000555555709380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000d000 CR3: 000000007d3f2000 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
 ip_tunnel_xmit+0x20ef/0x2940 net/ipv4/ip_tunnel.c:845
 __gre_xmit net/ipv4/ip_gre.c:469 [inline]
 ipgre_xmit+0x80b/0xbe0 net/ipv4/ip_gre.c:665
 __netdev_start_xmit include/linux/netdevice.h:4986 [inline]
 netdev_start_xmit include/linux/netdevice.h:5000 [inline]
 xmit_one net/core/dev.c:3547 [inline]
 dev_hard_start_xmit+0x244/0x770 net/core/dev.c:3563
 __dev_queue_xmit+0x19f4/0x3b10 net/core/dev.c:4351
 packet_snd net/packet/af_packet.c:3081 [inline]
 packet_sendmsg+0x47f4/0x6240 net/packet/af_packet.c:3113
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x223/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fe1a8c154d9
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:00007ffd779deb48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fe1a8c62390 RCX: 00007fe1a8c154d9
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000555500000000 R09: 0000555500000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007ffd779deb90
R13: 00007ffd779deb60 R14: 0000000000000001 R15: 00007ffd779deb90
 </TASK>