------------[ cut here ]------------
kernel BUG at net/core/dev.c:2871!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 359 Comm: syz-executor176 Not tainted 5.4.242-syzkaller-00065-g10e0626a3202 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
RIP: 0010:skb_checksum_help+0x873/0x880 net/core/dev.c:2871
Code: ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c d0 fc ff ff 48 89 df e8 8e cf 16 fe e9 c3 fc ff ff e8 64 15 e7 fd 0f 0b e8 5d 15 e7 fd <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56 41 55 41 54 53
RSP: 0018:ffff8881dbea6ea8 EFLAGS: 00010293
RAX: ffffffff837d1483 RBX: 0000000000000519 RCX: ffff8881dc0dcec0
RDX: 0000000000000000 RSI: 0000000000000519 RDI: 0000000000000621
RBP: 0000000000000621 R08: ffffffff837d0eff R09: ffffed103b7d4dc6
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f0b92e30
R13: 000000000000061f R14: ffff8881f0b92dc0 R15: 1ffff1103e1725c6
FS:  0000555555f94300(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 00000001dbcc0000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ip_do_fragment+0x15e/0x2200 net/ipv4/ip_output.c:789
 ip_finish_output_gso net/ipv4/ip_output.c:288 [inline]
 __ip_finish_output+0x49c/0x710 net/ipv4/ip_output.c:311
 NF_HOOK_COND include/linux/netfilter.h:297 [inline]
 ip_output+0x19b/0x3a0 net/ipv4/ip_output.c:440
 iptunnel_xmit+0x476/0x850 net/ipv4/ip_tunnel_core.c:78
 ip_tunnel_xmit+0x1a4e/0x2320 net/ipv4/ip_tunnel.c:817
 __gre_xmit net/ipv4/ip_gre.c:442 [inline]
 ipgre_xmit+0x7b3/0xac0 net/ipv4/ip_gre.c:634
 __netdev_start_xmit include/linux/netdevice.h:4521 [inline]
 netdev_start_xmit include/linux/netdevice.h:4535 [inline]
 xmit_one net/core/dev.c:3211 [inline]
 dev_hard_start_xmit+0x1b7/0x6b0 net/core/dev.c:3227
 __dev_queue_xmit+0x14da/0x27e0 net/core/dev.c:3792
 packet_snd net/packet/af_packet.c:3004 [inline]
 packet_sendmsg+0x472e/0x60e0 net/packet/af_packet.c:3033
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg net/socket.c:658 [inline]
 ____sys_sendmsg+0x5ac/0x8f0 net/socket.c:2287
 ___sys_sendmsg net/socket.c:2341 [inline]
 __sys_sendmsg+0x28b/0x380 net/socket.c:2387
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Modules linked in:
---[ end trace 61bcb71e269dba38 ]---
RIP: 0010:skb_checksum_help+0x873/0x880 net/core/dev.c:2871
Code: ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c d0 fc ff ff 48 89 df e8 8e cf 16 fe e9 c3 fc ff ff e8 64 15 e7 fd 0f 0b e8 5d 15 e7 fd <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56 41 55 41 54 53
RSP: 0018:ffff8881dbea6ea8 EFLAGS: 00010293
RAX: ffffffff837d1483 RBX: 0000000000000519 RCX: ffff8881dc0dcec0
RDX: 0000000000000000 RSI: 0000000000000519 RDI: 0000000000000621
RBP: 0000000000000621 R08: ffffffff837d0eff R09: ffffed103b7d4dc6
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f0b92e30
R13: 000000000000061f R14: ffff8881f0b92dc0 R15: 1ffff1103e1725c6
FS:  0000555555f94300(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 00000001dbcc0000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400