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 (10613) >= skb_headlen() (10613)
WARNING: CPU: 2 PID: 10995 at net/core/dev.c:3292 skb_checksum_help+0x525/0x730 net/core/dev.c:3292
Modules linked in:
CPU: 2 PID: 10995 Comm: syz-executor.2 Not tainted 6.6.0-syzkaller-14578-g1cfb751165ef #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:skb_checksum_help+0x525/0x730 net/core/dev.c:3292
Code: 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 f9 01 00 00 44 89 e2 2b 53 74 44 89 ee 48 c7 c7 a0 80 e8 8b e8 eb 18 dd f8 <0f> 0b e9 46 ff ff ff e8 ff 81 17 f9 44 0f b6 25 30 ba 92 06 31 ff
RSP: 0018:ffffc900080570a0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88801d04dbc0 RCX: ffffc90009612000
RDX: 0000000000040000 RSI: ffffffff814d2b16 RDI: 0000000000000001
RBP: ffff88801d04dc34 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 000000007366666f R12: 0000000000002975
R13: 0000000000002975 R14: ffff88801d04dc30 R15: 0000000000002a1d
FS:  00007fd3bbc5d6c0(0000) GS:ffff88806b800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000d000 CR3: 0000000029517000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip_do_fragment+0xa1b/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+0x49a/0x640 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/0x190 net/ipv4/ip_output.c:129
 iptunnel_xmit+0x618/0x9b0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x1db4/0x33b0 net/ipv4/ip_tunnel.c:831
 ipgre_xmit+0x63c/0x910 net/ipv4/ip_gre.c:662
 __netdev_start_xmit include/linux/netdevice.h:4918 [inline]
 netdev_start_xmit include/linux/netdevice.h:4932 [inline]
 xmit_one net/core/dev.c:3543 [inline]
 dev_hard_start_xmit+0x13d/0x6c0 net/core/dev.c:3559
 __dev_queue_xmit+0x9b4/0x3d10 net/core/dev.c:4344
 dev_queue_xmit include/linux/netdevice.h:3112 [inline]
 packet_xmit+0x257/0x380 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3087 [inline]
 packet_sendmsg+0x24d9/0x5580 net/packet/af_packet.c:3119
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2588
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2642
 __sys_sendmsg+0x117/0x1e0 net/socket.c:2671
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fd3bae7cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd3bbc5d0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd3baf9bf80 RCX: 00007fd3bae7cae9
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003
RBP: 00007fd3baec847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fd3baf9bf80 R15: 00007ffcbb47ba68
 </TASK>