------------[ cut here ]------------ kernel BUG at net/core/dev.c:2873! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 424 Comm: syz-executor.0 Not tainted 5.4.290-syzkaller-05054-g986c38813dff #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:ffff8881eaf66fa8 EFLAGS: 00010293 RAX: ffffffff8387618d RBX: 000000000000045c RCX: ffff8881ecde1f80 RDX: 0000000000000000 RSI: 000000000000045c RDI: 000000000000105f RBP: ffff8881eaf67030 R08: ffffffff83875bea R09: ffffed103d5ecde6 R10: 0000000000000000 R11: dffffc0000000001 R12: 000000000000105f R13: ffff8881dd42b940 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fdc73d976c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000f000 CR3: 00000001ec27d000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip_do_fragment+0x156/0x2170 net/ipv4/ip_output.c:789 ip_fragment+0x123/0x210 net/ipv4/ip_output.c:596 ip_finish_output_gso net/ipv4/ip_output.c:288 [inline] __ip_finish_output+0x4d8/0x740 net/ipv4/ip_output.c:311 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 ipip6_tunnel_xmit net/ipv6/sit.c:993 [inline] sit_tunnel_xmit+0x1972/0x2460 net/ipv6/sit.c:1035 __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_sendto+0x4f3/0x6c0 net/socket.c:1961 __do_sys_sendto net/socket.c:1973 [inline] __se_sys_sendto net/socket.c:1969 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:1969 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fdc74214ae9 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:00007fdc73d970c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fdc74333f80 RCX: 00007fdc74214ae9 RDX: 000000000000fc13 RSI: 0000000020000280 RDI: 0000000000000006 RBP: 00007fdc7426047a R08: 0000000000000000 R09: 000000000000002f R10: 0000000000000800 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fdc74333f80 R15: 00007ffe288f9ff8 Modules linked in: ---[ end trace 4ee7256df1407005 ]--- 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:ffff8881eaf66fa8 EFLAGS: 00010293 RAX: ffffffff8387618d RBX: 000000000000045c RCX: ffff8881ecde1f80 RDX: 0000000000000000 RSI: 000000000000045c RDI: 000000000000105f RBP: ffff8881eaf67030 R08: ffffffff83875bea R09: ffffed103d5ecde6 R10: 0000000000000000 R11: dffffc0000000001 R12: 000000000000105f R13: ffff8881dd42b940 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fdc73d976c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000f000 CR3: 00000001ec27d000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400