skb linear:   000000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
skb linear:   000000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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 (10633) >= skb_headlen() (10633)
WARNING: CPU: 0 PID: 21986 at net/core/dev.c:3325 skb_checksum_help+0x5f9/0x730 net/core/dev.c:3324
Modules linked in:
CPU: 0 PID: 21986 Comm: syz.3.3965 Not tainted 6.10.0-rc6-syzkaller-00163-g661e504db04c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:skb_checksum_help+0x5f9/0x730 net/core/dev.c:3324
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 60 63 c5 8c 44 89 f6 89 da e8 08 3d 01 f8 90 <0f> 0b 90 90 bb ea ff ff ff e9 65 fd ff ff e8 14 0f 3f f8 c6 05 2c
RSP: 0018:ffffc900093eeda8 EFLAGS: 00010246
RAX: 7dfb3d8edf25a100 RBX: 0000000000002989 RCX: 0000000000040000
RDX: ffffc90003752000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 0000000000002989 R08: ffffffff81585822 R09: fffffbfff1c39994
R10: dffffc0000000000 R11: fffffbfff1c39994 R12: 1ffff1100a646d4e
R13: dffffc0000000000 R14: 0000000000002989 R15: ffff888053236a00
FS:  00007f9d967a16c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000e000 CR3: 0000000047f02000 CR4: 00000000003506f0
DR0: 0000000000000006 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000009 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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+0x2113/0x2940 net/ipv4/ip_tunnel.c:857
 __gre_xmit net/ipv4/ip_gre.c:483 [inline]
 ipgre_xmit+0x956/0xd40 net/ipv4/ip_gre.c:687
 __netdev_start_xmit include/linux/netdevice.h:4882 [inline]
 netdev_start_xmit include/linux/netdevice.h:4896 [inline]
 xmit_one net/core/dev.c:3578 [inline]
 dev_hard_start_xmit+0x27a/0x7e0 net/core/dev.c:3594
 __dev_queue_xmit+0x1b0e/0x3d30 net/core/dev.c:4393
 packet_snd net/packet/af_packet.c:3080 [inline]
 packet_sendmsg+0x46c2/0x6150 net/packet/af_packet.c:3112
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2585
 ___sys_sendmsg net/socket.c:2639 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2668
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9d95975bd9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9d967a1048 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f9d95b03f60 RCX: 00007f9d95975bd9
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000004
RBP: 00007f9d959e4aa1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9d95b03f60 R15: 00007f9d95c2fa68
 </TASK>