------------[ cut here ]------------ kernel BUG at net/core/dev.c:2873! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 420 Comm: syz-executor.0 Not tainted 5.4.290-syzkaller-05053-g41adfeb3d639 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:skb_checksum_help+0x88d/0x890 net/core/dev.c:2873 Code: ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 13 fc ff ff 48 89 df e8 a4 d9 0e fe e9 06 fc ff ff e8 4a 39 de fd 0f 0b e8 43 39 de fd <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 49 89 fc 49 bd 00 RSP: 0018:ffff8881eae0ea68 EFLAGS: 00010293 RAX: ffffffff8387618d RBX: 0000000000002997 RCX: ffff8881ed8b2f40 RDX: 0000000000000000 RSI: 0000000000002997 RDI: 0000000000003536 RBP: ffff8881eae0eaf0 R08: ffffffff83875bea R09: ffffed103d5c1d3e R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000003536 R13: ffff8881f41ef6c0 R14: dffffc0000000000 R15: 00000000a8bf9f4a FS: 00007f912e3306c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000d000 CR3: 00000001d91c4000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_csum_hwoffload_help+0x533/0x670 net/core/dev.c:3286 validate_xmit_skb+0x60f/0xc10 net/core/dev.c:3329 __dev_queue_xmit+0xf4a/0x2790 net/core/dev.c:3813 dev_queue_xmit+0x17/0x20 net/core/dev.c:3854 neigh_hh_output include/net/neighbour.h:502 [inline] neigh_output include/net/neighbour.h:516 [inline] ip_finish_output2+0xb4f/0xfc0 net/ipv4/ip_output.c:236 __ip_finish_output+0x409/0x740 net/ipv4/ip_output.c:258 ip_finish_output+0x34/0x1e0 net/ipv4/ip_output.c:326 NF_HOOK_COND include/linux/netfilter.h:292 [inline] ip_output+0x19b/0x3a0 net/ipv4/ip_output.c:440 dst_output include/net/dst.h:438 [inline] ip_local_out+0x92/0xb0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x472/0x840 net/ipv4/ip_tunnel_core.c:78 ip_tunnel_xmit+0x1ac0/0x2690 net/ipv4/ip_tunnel.c:831 __gre_xmit net/ipv4/ip_gre.c:465 [inline] ipgre_xmit+0x7f8/0xb80 net/ipv4/ip_gre.c:660 __netdev_start_xmit include/linux/netdevice.h:4538 [inline] netdev_start_xmit include/linux/netdevice.h:4552 [inline] xmit_one net/core/dev.c:3221 [inline] dev_hard_start_xmit+0x1de/0x710 net/core/dev.c:3237 __dev_queue_xmit+0x138c/0x2790 net/core/dev.c:3821 dev_queue_xmit+0x17/0x20 net/core/dev.c:3854 packet_snd net/packet/af_packet.c:3060 [inline] packet_sendmsg+0x4553/0x60d0 net/packet/af_packet.c:3089 sock_sendmsg_nosec net/socket.c:638 [inline] __sock_sendmsg net/socket.c:650 [inline] ____sys_sendmsg+0x5ac/0x8f0 net/socket.c:2306 ___sys_sendmsg net/socket.c:2360 [inline] __sys_sendmsg+0x28b/0x380 net/socket.c:2406 __do_sys_sendmsg net/socket.c:2415 [inline] __se_sys_sendmsg net/socket.c:2413 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2413 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f912e7aee69 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:00007f912e3300c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f912e8dcf80 RCX: 00007f912e7aee69 RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003 RBP: 00007f912e7fb47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f912e8dcf80 R15: 00007ffc76ac5b68 Modules linked in: ---[ end trace 252983552cc9f45d ]--- RIP: 0010:skb_checksum_help+0x88d/0x890 net/core/dev.c:2873 Code: ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 13 fc ff ff 48 89 df e8 a4 d9 0e fe e9 06 fc ff ff e8 4a 39 de fd 0f 0b e8 43 39 de fd <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 49 89 fc 49 bd 00 RSP: 0018:ffff8881eae0ea68 EFLAGS: 00010293 RAX: ffffffff8387618d RBX: 0000000000002997 RCX: ffff8881ed8b2f40 RDX: 0000000000000000 RSI: 0000000000002997 RDI: 0000000000003536 RBP: ffff8881eae0eaf0 R08: ffffffff83875bea R09: ffffed103d5c1d3e R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000003536 R13: ffff8881f41ef6c0 R14: dffffc0000000000 R15: 00000000a8bf9f4a FS: 00007f912e3306c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000d000 CR3: 00000001d91c4000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400