skb frag:     00000090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
skb frag:     000000a0: 00 00 00 00 00 00 00 00
------------[ cut here ]------------
offset (10633) >= skb_headlen() (136)
WARNING: CPU: 1 PID: 6092 at net/core/dev.c:3326 skb_checksum_help+0x536/0x750 net/core/dev.c:3326
Modules linked in:
CPU: 1 PID: 6092 Comm: syz.2.295 Not tainted 6.10.0-syzkaller-04472-g51835949dda3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:skb_checksum_help+0x536/0x750 net/core/dev.c:3326
Code: 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 00 02 00 00 44 89 e2 2b 53 74 44 89 ee 48 c7 c7 80 41 52 8c e8 1b 6a 8a f8 90 <0f> 0b 90 90 e9 42 ff ff ff e8 3c 23 c8 f8 44 0f b6 25 5d 60 08 07
RSP: 0018:ffffc90009436f28 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88802cb1c140 RCX: ffffc9000a14c000
RDX: 0000000000040000 RSI: ffffffff81518ed6 RDI: 0000000000000001
RBP: ffff88802cb1c1b4 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000005a07
R13: 0000000000002989 R14: ffff88802cb1c1b0 R15: 0000000000002a31
FS:  00007f688d52a6c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000e000 CR3: 000000005ca70000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ip_do_fragment+0xa1e/0x18b0 net/ipv4/ip_output.c:777
 ip_fragment.constprop.0+0x161/0x230 net/ipv4/ip_output.c:584
 ip_finish_output_gso net/ipv4/ip_output.c:286 [inline]
 __ip_finish_output net/ipv4/ip_output.c:308 [inline]
 __ip_finish_output+0x5af/0x950 net/ipv4/ip_output.c:295
 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:433
 dst_output include/net/dst.h:450 [inline]
 ip_local_out+0x33e/0x4a0 net/ipv4/ip_output.c:129
 iptunnel_xmit+0x5b4/0x9b0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x1e82/0x33f0 net/ipv4/ip_tunnel.c:857
 __gre_xmit+0x89d/0xbd0 net/ipv4/ip_gre.c:483
 ipgre_xmit+0x578/0xb30 net/ipv4/ip_gre.c:687
 __netdev_start_xmit include/linux/netdevice.h:4913 [inline]
 netdev_start_xmit include/linux/netdevice.h:4922 [inline]
 xmit_one net/core/dev.c:3580 [inline]
 dev_hard_start_xmit+0x146/0x790 net/core/dev.c:3596
 __dev_queue_xmit+0x7c7/0x4300 net/core/dev.c:4423
 dev_queue_xmit include/linux/netdevice.h:3105 [inline]
 packet_xmit+0x23e/0x360 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3145 [inline]
 packet_sendmsg+0x268f/0x53a0 net/packet/af_packet.c:3177
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0xab8/0xc90 net/socket.c:2597
 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2651
 __sys_sendmsg+0x117/0x1f0 net/socket.c:2680
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f688c775a99
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:00007f688d52a048 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f688c903f60 RCX: 00007f688c775a99
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000005
RBP: 00007f688c7e4e5d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f688c903f60 R15: 00007ffebb9d77f8
 </TASK>