skb frag:     00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
skb frag:     00000050: 00 00 00 00 00 00 00 00 00 00 00 00
------------[ cut here ]------------
offset+2 (1321) > skb_headlen() (116)
WARNING: CPU: 1 PID: 9142 at net/core/dev.c:3301 skb_checksum_help+0x190/0x218 net/core/dev.c:3301
Modules linked in:
CPU: 1 PID: 9142 Comm: syz-executor.1 Not tainted 6.6.0-syzkaller-14578-g1cfb751165ef #0
Hardware name: linux,dummy-virt (DT)
pstate: 61400009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : skb_checksum_help+0x190/0x218 net/core/dev.c:3301
lr : skb_checksum_help+0x190/0x218 net/core/dev.c:3301
sp : ffff800082ecb4a0
x29: ffff800082ecb4a0 x28: 0000000000000002 x27: 0000000000000001
x26: 0000000000000000 x25: ffff8000815cbab0 x24: 0000000000000000
x23: 0000000000000000 x22: 000000000000bc21 x21: 0000000000000529
x20: ffff8000826c94eb x19: f4ff00002a43de00 x18: ffffffffffffffff
x17: 3020303020303020 x16: 3030203030203030 x15: ffff800082ecaef0
x14: 0000000000000000 x13: ffff8000824cadf8 x12: 00000000000012d8
x11: 0000000000000648 x10: ffff80008257adf8 x9 : ffff8000824cadf8
x8 : 00000000ffffdfff x7 : ffff80008257adf8 x6 : 80000000ffffe000
x5 : 0000000000017ff4 x4 : 0000000000000000 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000000 x0 : fcff000029f30fc0
Call trace:
 skb_checksum_help+0x190/0x218 net/core/dev.c:3301
 ip_do_fragment+0x34c/0x580 net/ipv4/ip_output.c:777
 ip_fragment.constprop.0+0x48/0xe8 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+0x15c/0x19c net/ipv4/ip_output.c:295
 ip_finish_output+0x34/0x108 net/ipv4/ip_output.c:323
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_mc_output+0x70/0x278 net/ipv4/ip_output.c:420
 dst_output include/net/dst.h:451 [inline]
 ip_local_out+0x48/0x5c net/ipv4/ip_output.c:129
 iptunnel_xmit+0x138/0x330 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x570/0xa64 net/ipv4/ip_tunnel.c:831
 __gre_xmit+0x188/0x230 net/ipv4/ip_gre.c:469
 ipgre_xmit+0x1bc/0x288 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+0x90/0x110 net/core/dev.c:3559
 __dev_queue_xmit+0x1c0/0xe54 net/core/dev.c:4344
 dev_queue_xmit include/linux/netdevice.h:3112 [inline]
 packet_xmit+0xcc/0x144 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3087 [inline]
 packet_sendmsg+0x828/0x1530 net/packet/af_packet.c:3119
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x54/0x60 net/socket.c:745
 ____sys_sendmsg+0x274/0x2ac net/socket.c:2588
 ___sys_sendmsg+0xac/0x100 net/socket.c:2642
 __sys_sendmsg+0x84/0xe0 net/socket.c:2671
 __do_sys_sendmsg net/socket.c:2680 [inline]
 __se_sys_sendmsg net/socket.c:2678 [inline]
 __arm64_sys_sendmsg+0x24/0x30 net/socket.c:2678
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:51
 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:155
 el0_svc+0x34/0xd8 arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:595
---[ end trace 0000000000000000 ]---