------------[ cut here ]------------ kernel BUG at net/core/dev.c:3226! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 29337 Comm: syz-executor.3 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_checksum_help+0x4c1/0x5b0 net/core/dev.c:3226 Code: fb 45 89 ec e9 59 ff ff ff e8 2b 9f 38 fb 48 89 ef 41 bc ea ff ff ff e8 1d f9 ff ff eb c7 e8 16 9f 38 fb 0f 0b e8 0f 9f 38 fb <0f> 0b 4c 89 f7 e8 25 b7 78 fb e9 6c fb ff ff e8 2b b7 78 fb e9 1b RSP: 0018:ffffc90004c47348 EFLAGS: 00010216 RAX: 0000000000005425 RBX: 00000000000003c4 RCX: ffffc9000f880000 RDX: 0000000000040000 RSI: ffffffff863ba001 RDI: 0000000000000006 RBP: ffff888048192340 R08: ffffc90004c472d8 R09: ffff8880445fa9a0 R10: 00000000000003c6 R11: ffff8880a724f040 R12: 000000000000039c R13: 00000000000003c6 R14: ffff8880481923c0 R15: 00000000000003c4 FS: 00007f5490386700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30a21000 CR3: 00000000387fa000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip_do_fragment+0xd08/0x1bd0 net/ipv4/ip_output.c:784 ip_fragment.constprop.0+0x174/0x240 net/ipv4/ip_output.c:579 __ip_finish_output net/ipv4/ip_output.c:304 [inline] __ip_finish_output+0x4d5/0xcb0 net/ipv4/ip_output.c:288 ip_finish_output+0x34/0x1f0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_output+0x196/0x310 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:443 [inline] ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:125 iptunnel_xmit+0x5a0/0x9b0 net/ipv4/ip_tunnel_core.c:82 geneve_xmit_skb drivers/net/geneve.c:956 [inline] geneve_xmit+0x11a2/0x2d30 drivers/net/geneve.c:1055 __netdev_start_xmit include/linux/netdevice.h:4634 [inline] netdev_start_xmit include/linux/netdevice.h:4648 [inline] xmit_one net/core/dev.c:3561 [inline] dev_hard_start_xmit+0x193/0x950 net/core/dev.c:3577 __dev_queue_xmit+0x2091/0x2d60 net/core/dev.c:4136 packet_snd net/packet/af_packet.c:2984 [inline] packet_sendmsg+0x2413/0x5290 net/packet/af_packet.c:3009 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 __sys_sendto+0x21c/0x320 net/socket.c:1992 __do_sys_sendto net/socket.c:2004 [inline] __se_sys_sendto net/socket.c:2000 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2000 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5490385c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000000000002d180 RCX: 000000000045d5b9 RDX: 0000000000003287 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 000000000118cf98 R08: 0000000000000000 R09: 00000000000002ff R10: 0000000004000002 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007fffde16bb4f R14: 00007f54903869c0 R15: 000000000118cf4c Modules linked in: ---[ end trace 4bcd67af27404b07 ]--- RIP: 0010:skb_checksum_help+0x4c1/0x5b0 net/core/dev.c:3226 Code: fb 45 89 ec e9 59 ff ff ff e8 2b 9f 38 fb 48 89 ef 41 bc ea ff ff ff e8 1d f9 ff ff eb c7 e8 16 9f 38 fb 0f 0b e8 0f 9f 38 fb <0f> 0b 4c 89 f7 e8 25 b7 78 fb e9 6c fb ff ff e8 2b b7 78 fb e9 1b RSP: 0018:ffffc90004c47348 EFLAGS: 00010216 RAX: 0000000000005425 RBX: 00000000000003c4 RCX: ffffc9000f880000 RDX: 0000000000040000 RSI: ffffffff863ba001 RDI: 0000000000000006 RBP: ffff888048192340 R08: ffffc90004c472d8 R09: ffff8880445fa9a0 R10: 00000000000003c6 R11: ffff8880a724f040 R12: 000000000000039c R13: 00000000000003c6 R14: ffff8880481923c0 R15: 00000000000003c4 FS: 00007f5490386700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30a21000 CR3: 00000000387fa000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400