------------[ cut here ]------------ kernel BUG at net/core/dev.c:2869! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 867 Comm: syz.2.150 Not tainted 5.4.276-syzkaller-00020-g4275fce9fe94 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:skb_checksum_help+0x86c/0x880 net/core/dev.c:2869 Code: 05 16 fe e9 b3 fc ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c d0 fc ff ff 48 89 df e8 0e 05 16 fe e9 c3 fc ff ff e8 f4 1f e6 fd <0f> 0b e8 ed 1f e6 fd 0f 0b 66 66 2e 0f 1f 84 00 00 00 00 00 41 57 RSP: 0018:ffff8881e247eec8 EFLAGS: 00010283 RAX: ffffffff837e190c RBX: 0000000000002989 RCX: 0000000000040000 RDX: ffffc90001146000 RSI: 0000000000001172 RDI: 0000000000001173 RBP: 0000000000002989 R08: ffffffff837e1307 R09: ffff8881e247f080 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881e02a7bb0 R13: 0000000000002989 R14: ffff8881e02a7b40 R15: 1ffff1103c054f76 FS: 00007f5ed7f526c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000e000 CR3: 00000001e1347000 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 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+0x1ac0/0x2690 net/ipv4/ip_tunnel.c:831 __gre_xmit net/ipv4/ip_gre.c:465 [inline] ipgre_xmit+0x81a/0xbf0 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+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 RIP: 0033:0x7f5ed8cd0b99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5ed7f52048 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f5ed8e5efa0 RCX: 00007f5ed8cd0b99 RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000004 RBP: 00007f5ed8d5177e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f5ed8e5efa0 R15: 00007ffebca07668 Modules linked in: ---[ end trace 7f20d18039e51425 ]--- RIP: 0010:skb_checksum_help+0x86c/0x880 net/core/dev.c:2869 Code: 05 16 fe e9 b3 fc ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c d0 fc ff ff 48 89 df e8 0e 05 16 fe e9 c3 fc ff ff e8 f4 1f e6 fd <0f> 0b e8 ed 1f e6 fd 0f 0b 66 66 2e 0f 1f 84 00 00 00 00 00 41 57 RSP: 0018:ffff8881e247eec8 EFLAGS: 00010283 RAX: ffffffff837e190c RBX: 0000000000002989 RCX: 0000000000040000 RDX: ffffc90001146000 RSI: 0000000000001172 RDI: 0000000000001173 RBP: 0000000000002989 R08: ffffffff837e1307 R09: ffff8881e247f080 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881e02a7bb0 R13: 0000000000002989 R14: ffff8881e02a7b40 R15: 1ffff1103c054f76 FS: 00007f5ed7f526c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000e000 CR3: 00000001e1347000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400