------------[ cut here ]------------ WARNING: CPU: 0 PID: 5019 at net/core/dev.c:3295 skb_checksum_help+0x4a3/0x5c0 net/core/dev.c:3295 Modules linked in: CPU: 0 PID: 5019 Comm: syz-executor413 Not tainted 6.4.0-syzkaller-12316-g4f6b6c2b2f86 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 RIP: 0010:skb_checksum_help+0x4a3/0x5c0 net/core/dev.c:3295 Code: 32 69 f9 0f 0b 0f b6 1d e3 f0 78 06 31 ff 89 de e8 02 2e 69 f9 84 db 0f 84 cf 00 00 00 41 bc ea ff ff ff eb ad e8 0d 32 69 f9 <0f> 0b 0f b6 1d bb f0 78 06 31 ff 89 de e8 db 2d 69 f9 84 db 75 dd RSP: 0018:ffffc90003aef120 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 000000000000061f RCX: 0000000000000000 RDX: ffff888028595940 RSI: ffffffff881bad63 RDI: 0000000000000006 RBP: ffff8880728c7500 R08: 0000000000000006 R09: 0000000000000621 R10: 0000000000000519 R11: 0000000000000001 R12: ffff8880728c7574 R13: 000000000000061f R14: 0000000000000519 R15: 0000000000000621 FS: 0000555556901300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001000 CR3: 000000002c41d000 CR4: 0000000000350ef0 Call Trace: ip_do_fragment+0x9a4/0x17f0 net/ipv4/ip_output.c:776 ip_fragment.constprop.0+0x16b/0x240 net/ipv4/ip_output.c:583 ip_finish_output_gso net/ipv4/ip_output.c:281 [inline] __ip_finish_output net/ipv4/ip_output.c:303 [inline] __ip_finish_output+0x4a0/0x650 net/ipv4/ip_output.c:290 ip_finish_output+0x31/0x280 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:292 [inline] ip_output+0x1a3/0x320 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:458 [inline] ip_local_out+0xb3/0x1a0 net/ipv4/ip_output.c:127 iptunnel_xmit+0x622/0xa40 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0xfc0/0x3170 net/ipv4/ip_tunnel.c:831 ipgre_xmit+0x6d3/0x8f0 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4910 [inline] netdev_start_xmit include/linux/netdevice.h:4924 [inline] xmit_one net/core/dev.c:3537 [inline] dev_hard_start_xmit+0x187/0x700 net/core/dev.c:3553 __dev_queue_xmit+0x2be2/0x3b10 net/core/dev.c:4203 dev_queue_xmit include/linux/netdevice.h:3088 [inline] packet_xmit+0x260/0x390 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3081 [inline] packet_sendmsg+0x34ad/0x5090 net/packet/af_packet.c:3113 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0xde/0x190 net/socket.c:748 ____sys_sendmsg+0x739/0x920 net/socket.c:2494 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2548 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2577 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f7b200d8559 Code: 28 c3 e8 4a 15 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcda80f308 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffcda80f318 RCX: 00007f7b200d8559 RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 00007ffcda80f320 R13: 00007ffcda80f340 R14: 0000000000000000 R15: 0000000000000000