------------[ cut here ]------------
WARNING: CPU: 0 PID: 5044 at net/core/dev.c:3302 skb_checksum_help+0x4b5/0x5c0 net/core/dev.c:3302
Modules linked in:
CPU: 0 PID: 5044 Comm: syz-executor218 Not tainted 6.6.0-rc1-syzkaller-00336-gd692873cbe86 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0010:skb_checksum_help+0x4b5/0x5c0 net/core/dev.c:3302
Code: f9 40 84 ed 75 dd e8 5a eb 54 f9 31 d2 48 89 de 48 c7 c7 80 0d a3 8b c6 05 99 62 85 06 01 e8 02 1c f8 ff eb be e8 3b eb 54 f9 <0f> 0b 0f b6 2d 83 62 85 06 31 ff 89 ee e8 59 e6 54 f9 40 84 ed 75
RSP: 0018:ffffc90003c2f0a0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802709db40 RCX: 0000000000000000
RDX: ffff88801ab79dc0 RSI: ffffffff8832ed15 RDI: 0000000000000006
RBP: ffff88802709dbb4 R08: 0000000000000006 R09: 0000000000000529
R10: 000000000000007c R11: ffffffff8a60008b R12: 0000000000000527
R13: 0000000000000527 R14: 000000000000007c R15: 0000000000000529
FS:  0000555556cb9380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 0000000028054000 CR4: 00000000003506f0
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:775
 ip_fragment.constprop.0+0x161/0x230 net/ipv4/ip_output.c:582
 ip_finish_output_gso net/ipv4/ip_output.c:284 [inline]
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x49a/0x640 net/ipv4/ip_output.c:293
 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:321
 NF_HOOK_COND include/linux/netfilter.h:293 [inline]
 ip_mc_output+0x1dd/0x6a0 net/ipv4/ip_output.c:418
 dst_output include/net/dst.h:458 [inline]
 ip_local_out+0xaf/0x190 net/ipv4/ip_output.c:127
 iptunnel_xmit+0x61a/0x9e0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x1e14/0x3350 net/ipv4/ip_tunnel.c:831
 ipgre_xmit+0x63c/0x910 net/ipv4/ip_gre.c:662
 __netdev_start_xmit include/linux/netdevice.h:4910 [inline]
 netdev_start_xmit include/linux/netdevice.h:4924 [inline]
 xmit_one net/core/dev.c:3544 [inline]
 dev_hard_start_xmit+0x13d/0x6c0 net/core/dev.c:3560
 __dev_queue_xmit+0x9be/0x3d80 net/core/dev.c:4340
 dev_queue_xmit include/linux/netdevice.h:3091 [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+0xd9/0x180 net/socket.c:753
 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2541
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2595
 __sys_sendmsg+0x117/0x1e0 net/socket.c:2624
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fef3e6df4d9
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:00007ffe6607dcf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fef3e72c390 RCX: 00007fef3e6df4d9
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000555500000000 R09: 0000555500000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007ffe6607dd40
R13: 00007ffe6607dd10 R14: 0000000000000001 R15: 00007ffe6607dd40
 </TASK>