skb linear:   00000030: 27 af 62 8d 6d 00 62 1a df e9 68 fa d5 d7 8d 00
skb linear:   00000040: 00 00 00 11 98 99 74 55 40 88 b5 01 b9 e7 69 3b
skb linear:   00000050: ce 99 42 fa 94 19 5b 50 63 00 00 00 23 77 00 00
skb linear:   00000060: 00 00 00 00
skb frag:     00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
skb frag:     00000010: 00 00 00 00 00 00 00 00 00 00 00 00
------------[ cut here ]------------
offset+2 (43049) > skb_headlen() (100)
WARNING: CPU: 1 PID: 5063 at net/core/dev.c:3302 skb_checksum_help+0x5e2/0x740 net/core/dev.c:3302
Modules linked in:
CPU: 1 PID: 5063 Comm: syz-executor123 Not tainted 6.7.0-syzkaller-12305-g9f538b415db8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:skb_checksum_help+0x5e2/0x740 net/core/dev.c:3302
Code: 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 52 01 00 00 44 89 e2 2b 53 74 4c 89 ee 48 c7 c7 20 58 ea 8b e8 ff 09 d4 f8 90 <0f> 0b 90 90 e9 87 fe ff ff e8 00 df 65 f9 e9 4b fa ff ff 48 89 ef
RSP: 0018:ffffc90003adf088 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888021316140 RCX: ffffffff814e18f9
RDX: ffff8880285f3b80 RSI: ffffffff814e1906 RDI: 0000000000000001
RBP: ffff8880213161b4 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000080
R13: 000000000000a829 R14: ffff8880213161b0 R15: 000000000000a827
FS:  0000555556a3e380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000d000 CR3: 00000000244b6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip_do_fragment+0xa15/0x18a0 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+0x49c/0x650 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_mc_output+0x1dd/0x6a0 net/ipv4/ip_output.c:420
 dst_output include/net/dst.h:451 [inline]
 ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:129
 iptunnel_xmit+0x5b4/0x9b0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x1daa/0x33b0 net/ipv4/ip_tunnel.c:831
 ipgre_xmit+0x49b/0x980 net/ipv4/ip_gre.c:665
 __netdev_start_xmit include/linux/netdevice.h:4989 [inline]
 netdev_start_xmit include/linux/netdevice.h:5003 [inline]
 xmit_one net/core/dev.c:3547 [inline]
 dev_hard_start_xmit+0x137/0x6d0 net/core/dev.c:3563
 __dev_queue_xmit+0x7b6/0x3ed0 net/core/dev.c:4351
 dev_queue_xmit include/linux/netdevice.h:3171 [inline]
 packet_xmit+0x237/0x350 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3081 [inline]
 packet_sendmsg+0x24a6/0x51e0 net/packet/af_packet.c:3113
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638
 __sys_sendmsg+0x117/0x1e0 net/socket.c:2667
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f3033a2e4d9
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:00007ffc9035dc18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3033a7b390 RCX: 00007f3033a2e4d9
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000555500000000 R09: 0000555500000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007ffc9035dc60
R13: 00007ffc9035dc30 R14: 0000000000000001 R15: 00007ffc9035dc60
 </TASK>