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+2 (40565) > skb_headlen() (1651)
WARNING: CPU: 1 PID: 6977 at net/core/dev.c:3314 skb_checksum_help+0x5cc/0x64c
Modules linked in:
CPU: 1 PID: 6977 Comm: syz-executor.2 Not tainted 6.1.89-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 60401005 (nZCv daif +PAN -UAO -TCO -DIT +SSBS BTYPE=--)
pc : skb_checksum_help+0x5cc/0x64c
lr : skb_checksum_help+0x5c8/0x64c net/core/dev.c:3313
sp : ffff80001f9f6aa0
x29: ffff80001f9f6ac0 x28: 0000000000009e73 x27: dfff800000000000
x26: 0000000000000673 x25: 000000000000d56e x24: 0000000000009e75
x23: ffff0000c965fc18 x22: ffff0000c965fbb0 x21: ffff0000c965fb40
x20: 00000000ffffffea x19: 0000000000000673 x18: ffff80001f9f5e20
x17: 0000000000000000 x16: ffff8000120adc40 x15: 0000000000000002
x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000040000
x11: 000000000001b555 x10: ffff80002333c000 x9 : 13235b765f541a00
x8 : 13235b765f541a00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001f9f6398 x4 : ffff800015932b00 x3 : ffff80000834e968
x2 : 0000000000000001 x1 : 0000000000000200 x0 : 0000000000000000
Call trace:
 skb_checksum_help+0x5cc/0x64c
 ip_do_fragment+0x1bc/0x1b14 net/ipv4/ip_output.c:774
 ip_fragment+0x11c/0x308
 ip_finish_output_gso net/ipv4/ip_output.c:279 [inline]
 __ip_finish_output+0x280/0x458 net/ipv4/ip_output.c:301
 ip_finish_output+0x40/0x268 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_output+0x330/0x49c net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0x120/0x160 net/ipv4/ip_output.c:126
 iptunnel_xmit+0x40c/0x8ec net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x19a0/0x28bc net/ipv4/ip_tunnel.c:840
 __gre_xmit net/ipv4/ip_gre.c:474 [inline]
 ipgre_xmit+0x70c/0xab0 net/ipv4/ip_gre.c:669
 __netdev_start_xmit include/linux/netdevice.h:4853 [inline]
 netdev_start_xmit include/linux/netdevice.h:4867 [inline]
 xmit_one net/core/dev.c:3627 [inline]
 dev_hard_start_xmit+0x25c/0x9a4 net/core/dev.c:3643
 __dev_queue_xmit+0x186c/0x38d8 net/core/dev.c:4293
 dev_queue_xmit+0x24/0x34 include/linux/netdevice.h:3021
 packet_snd net/packet/af_packet.c:3077 [inline]
 packet_sendmsg+0x36f0/0x4cd8 net/packet/af_packet.c:3108
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x55c/0x848 net/socket.c:2514
 ___sys_sendmsg net/socket.c:2568 [inline]
 __sys_sendmsg+0x26c/0x33c net/socket.c:2597
 __do_sys_sendmsg net/socket.c:2606 [inline]
 __se_sys_sendmsg net/socket.c:2604 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2604
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 797
hardirqs last  enabled at (796): [<ffff800008343d08>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261
hardirqs last disabled at (797): [<ffff80001215d594>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (224): [<ffff800008033178>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (324): [<ffff80001044bdfc>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---