------------[ cut here ]------------ WARNING: CPU: 0 PID: 10248 at net/core/dev.c:3249 skb_checksum_help+0x3c3/0x560 Modules linked in: CPU: 0 PID: 10248 Comm: syz-executor.1 Not tainted 5.15.115-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 RIP: 0010:skb_checksum_help+0x3c3/0x560 net/core/dev.c:3249 Code: ff eb e3 e8 0f 7b 4d f9 4c 89 ff e8 b7 01 00 00 bb ea ff ff ff eb cf e8 fb 7a 4d f9 0f 0b bb ea ff ff ff eb c1 e8 ed 7a 4d f9 <0f> 0b bb ea ff ff ff eb b3 44 89 e1 80 e1 07 fe c1 38 c1 0f 8c 5f RSP: 0018:ffffc9000b9b6ee8 EFLAGS: 00010283 RAX: ffffffff88327e63 RBX: 00000000000006aa RCX: 0000000000040000 RDX: ffffc90003e97000 RSI: 0000000000000ba6 RDI: 0000000000000ba7 RBP: 0000000000000688 R08: ffffffff88327d52 R09: fffff52001736dce R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff88807a8e2bb0 R14: 1ffff1100f51c578 R15: ffff88807a8e2b40 FS: 00007f9c4fbae700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001000 CR3: 0000000023627000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip_do_fragment+0x1cf/0x1f10 net/ipv4/ip_output.c:774 ip_finish_output_gso net/ipv4/ip_output.c:279 [inline] __ip_finish_output+0x2bd/0x4a0 net/ipv4/ip_output.c:301 iptunnel_xmit+0x50c/0x960 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1c55/0x24a0 net/ipv4/ip_tunnel.c:810 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x756/0xa60 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:5019 [inline] netdev_start_xmit include/linux/netdevice.h:5033 [inline] xmit_one net/core/dev.c:3594 [inline] dev_hard_start_xmit+0x298/0x7a0 net/core/dev.c:3610 __dev_queue_xmit+0x1cee/0x3230 net/core/dev.c:4225 packet_snd net/packet/af_packet.c:3035 [inline] packet_sendmsg+0x4478/0x5e70 net/packet/af_packet.c:3066 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2412 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2466 __sys_sendmsg net/socket.c:2495 [inline] __do_sys_sendmsg net/socket.c:2504 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2502 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+0x61/0xcb RIP: 0033:0x7f9c5163c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9c4fbae168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f9c5175bf80 RCX: 00007f9c5163c169 RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003 RBP: 00007f9c51697ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdf3cda92f R14: 00007f9c4fbae300 R15: 0000000000022000