------------[ cut here ]------------ kernel BUG at net/core/dev.c:2873! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 358 Comm: syz-executor822 Not tainted 5.4.268-syzkaller-00003-g2d5d8240a7cb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:skb_checksum_help+0x873/0x880 net/core/dev.c:2873 Code: ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c d0 fc ff ff 48 89 df e8 2e 2b 16 fe e9 c3 fc ff ff e8 44 57 e6 fd 0f 0b e8 3d 57 e6 fd <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56 41 55 41 54 53 RSP: 0018:ffff8881dc07ee68 EFLAGS: 00010293 RAX: ffffffff837defe3 RBX: 0000000000000673 RCX: ffff8881dc618fc0 RDX: 0000000000000000 RSI: 0000000000000673 RDI: 0000000000009e75 RBP: 0000000000009e75 R08: ffffffff837dea5f R09: ffffed103b80fdbe R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f0da4430 R13: 0000000000009e73 R14: ffff8881f0da43c0 R15: 1ffff1103e1b4886 FS: 0000555556c80380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000e000 CR3: 00000001dc764000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip_do_fragment+0x15e/0x2200 net/ipv4/ip_output.c:789 ip_finish_output_gso net/ipv4/ip_output.c:288 [inline] __ip_finish_output+0x49c/0x710 net/ipv4/ip_output.c:311 NF_HOOK_COND include/linux/netfilter.h:292 [inline] ip_output+0x19b/0x3a0 net/ipv4/ip_output.c:440 iptunnel_xmit+0x476/0x850 net/ipv4/ip_tunnel_core.c:78 ip_tunnel_xmit+0x1aa7/0x26a0 net/ipv4/ip_tunnel.c:817 __gre_xmit net/ipv4/ip_gre.c:442 [inline] ipgre_xmit+0x81a/0xbf0 net/ipv4/ip_gre.c:637 __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+0x1b7/0x6b0 net/core/dev.c:3237 __dev_queue_xmit+0x14da/0x27e0 net/core/dev.c:3802 packet_snd net/packet/af_packet.c:3009 [inline] packet_sendmsg+0x4747/0x6100 net/packet/af_packet.c:3038 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_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Modules linked in: ---[ end trace 3ef932202fae4c6b ]--- RIP: 0010:skb_checksum_help+0x873/0x880 net/core/dev.c:2873 Code: ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c d0 fc ff ff 48 89 df e8 2e 2b 16 fe e9 c3 fc ff ff e8 44 57 e6 fd 0f 0b e8 3d 57 e6 fd <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56 41 55 41 54 53 RSP: 0018:ffff8881dc07ee68 EFLAGS: 00010293 RAX: ffffffff837defe3 RBX: 0000000000000673 RCX: ffff8881dc618fc0 RDX: 0000000000000000 RSI: 0000000000000673 RDI: 0000000000009e75 RBP: 0000000000009e75 R08: ffffffff837dea5f R09: ffffed103b80fdbe R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f0da4430 R13: 0000000000009e73 R14: ffff8881f0da43c0 R15: 1ffff1103e1b4886 FS: 0000555556c80380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000e000 CR3: 00000001dc764000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400