------------[ cut here ]------------
kernel BUG at net/core/dev.c:3260!
invalid opcode: 0000 [#1] PREEMPT SMP
CPU: 1 PID: 3668 Comm: syz-executor.0 Not tainted 5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:skb_checksum_help+0x10e/0x120 net/core/dev.c:3260
Code: 57 ff ff ff e8 43 f7 fe ff 48 85 c0 74 21 8b 75 74 48 8b 95 c0 00 00 00 e9 3e ff ff ff e8 4a fe ff ff b8 ea ff ff ff eb cd 90 <0f> 0b 90 0f 0b b8 f4 ff ff ff eb c0 66 0f 1f 44 00 00 f6 87 82 00
RSP: 0018:ffffc900012e3940 EFLAGS: 00010297
RAX: 0000000000000088 RBX: ffff88810be49a40 RCX: 00000000000074a1
RDX: 0000000000002975 RSI: 0000000000000000 RDI: 0000000000002975
RBP: ffff888108120500 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000080000 R11: 0000000000000001 R12: 0000000000007419
R13: 00000000000005dc R14: 0000000000000000 R15: ffff8881469b7900
FS:  00007fdaba8e16c0(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556be7da8 CR3: 000000010819b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ip_do_fragment+0x1f7/0x470 net/ipv4/ip_output.c:787
 ip_finish_output_gso net/ipv4/ip_output.c:281 [inline]
 __ip_finish_output.part.0+0xee/0x130 net/ipv4/ip_output.c:303
 iptunnel_xmit+0x15a/0x230 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x759/0xae0 net/ipv4/ip_tunnel.c:804
 ipgre_xmit+0x17c/0x210 net/ipv4/ip_gre.c:648
 __netdev_start_xmit include/linux/netdevice.h:4825 [inline]
 netdev_start_xmit include/linux/netdevice.h:4839 [inline]
 xmit_one net/core/dev.c:3605 [inline]
 dev_hard_start_xmit+0x109/0x2d0 net/core/dev.c:3621
 __dev_queue_xmit+0x746/0x9c0 net/core/dev.c:4194
 packet_snd net/packet/af_packet.c:3006 [inline]
 packet_sendmsg+0xac9/0x15f0 net/packet/af_packet.c:3031
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0x2e/0x40 net/socket.c:674
 ____sys_sendmsg+0x235/0x250 net/socket.c:2350
 ___sys_sendmsg+0x6e/0xb0 net/socket.c:2404
 __sys_sendmsg+0x54/0xa0 net/socket.c:2433
 do_syscall_64+0x2e/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fdabad5ece9
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:00007fdaba8e10c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdabae7df80 RCX: 00007fdabad5ece9
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003
RBP: 00007fdabadab47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fdabae7df80 R15: 00007ffdc2066248
Modules linked in:
---[ end trace 5f2765803322b418 ]---
RIP: 0010:skb_checksum_help+0x10e/0x120 net/core/dev.c:3260
Code: 57 ff ff ff e8 43 f7 fe ff 48 85 c0 74 21 8b 75 74 48 8b 95 c0 00 00 00 e9 3e ff ff ff e8 4a fe ff ff b8 ea ff ff ff eb cd 90 <0f> 0b 90 0f 0b b8 f4 ff ff ff eb c0 66 0f 1f 44 00 00 f6 87 82 00
RSP: 0018:ffffc900012e3940 EFLAGS: 00010297
RAX: 0000000000000088 RBX: ffff88810be49a40 RCX: 00000000000074a1
RDX: 0000000000002975 RSI: 0000000000000000 RDI: 0000000000002975
RBP: ffff888108120500 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000080000 R11: 0000000000000001 R12: 0000000000007419
R13: 00000000000005dc R14: 0000000000000000 R15: ffff8881469b7900
FS:  00007fdaba8e16c0(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556be7da8 CR3: 000000010819b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400