netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
------------[ cut here ]------------
WARNING: CPU: 0 PID: 3508 at net/core/dev.c:3284 skb_checksum_help+0x3d0/0x5b0
Modules linked in:
CPU: 0 PID: 3508 Comm: syz-executor241 Not tainted 6.1.45-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:skb_checksum_help+0x3d0/0x5b0 net/core/dev.c:3284
Code: 4c 89 ff e8 02 02 00 00 bb ea ff ff ff eb cf 0f 0b 80 3d da 7d e3 05 01 0f 85 ac 01 00 00 e8 c7 f7 0d f9 bb ea ff ff ff eb b4 <0f> 0b 80 3d c0 7d e3 05 01 0f 85 9f 01 00 00 e8 ac f7 0d f9 bb ea
RSP: 0018:ffffc90003a0ef08 EFLAGS: 00010212
RAX: 0000000000000000 RBX: 0000000000000621 RCX: ffff88802718bb80
RDX: ffff888014aef6b4 RSI: 0000000000000519 RDI: 0000000000000621
RBP: 0000000000000519 R08: ffffffff887c0525 R09: fffff52000741dd2
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100295ded8
R13: ffff888014aef6b0 R14: dffffc0000000000 R15: ffff888014aef640
FS:  0000555555c5d380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 000000007273d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip_do_fragment+0x209/0x1b20 net/ipv4/ip_output.c:774
 ip_finish_output_gso net/ipv4/ip_output.c:279 [inline]
 __ip_finish_output+0x2bd/0x4b0 net/ipv4/ip_output.c:301
 iptunnel_xmit+0x50c/0x930 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x2296/0x2c70 net/ipv4/ip_tunnel.c:813
 __gre_xmit net/ipv4/ip_gre.c:469 [inline]
 ipgre_xmit+0x759/0xa60 net/ipv4/ip_gre.c:661
 __netdev_start_xmit include/linux/netdevice.h:4853 [inline]
 netdev_start_xmit include/linux/netdevice.h:4867 [inline]
 xmit_one net/core/dev.c:3595 [inline]
 dev_hard_start_xmit+0x261/0x8c0 net/core/dev.c:3611
 __dev_queue_xmit+0x1b97/0x3c90 net/core/dev.c:4261
 packet_snd net/packet/af_packet.c:3073 [inline]
 packet_sendmsg+0x4750/0x6170 net/packet/af_packet.c:3104
 sock_sendmsg_nosec net/socket.c:716 [inline]
 sock_sendmsg net/socket.c:736 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2482
 ___sys_sendmsg net/socket.c:2536 [inline]
 __sys_sendmsg+0x2a9/0x390 net/socket.c:2565
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc6642584d9
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:00007fff2e9a5b48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fc6642a5390 RCX: 00007fc6642584d9
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000555500000000 R09: 0000555500000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007fff2e9a5b90
R13: 00007fff2e9a5b60 R14: 0000000000000001 R15: 00007fff2e9a5b90
 </TASK>