BUG: unable to handle page fault for address: ffff888240000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 7801067 P4D 7801067 PUD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 26432 Comm: syz-executor.1 Not tainted 5.4.125-syzkaller-00015-gf4bf8b65e48f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:do_csum arch/x86/lib/csum-partial_64.c:72 [inline]
RIP: 0010:csum_partial+0x194/0x470 arch/x86/lib/csum-partial_64.c:136
Code: 89 44 24 28 45 31 ff 48 8b 6c 24 08 66 2e 0f 1f 84 00 00 00 00 00 4c 03 6d 00 4c 13 6d 08 4c 13 6d 10 4c 13 6d 18 4c 13 6d 20 <4c> 13 6d 28 4c 13 6d 30 4c 13 6d 38 4d 11 fd 45 85 f6 74 0e 48 83
RSP: 0018:ffff8881f07cf3a8 EFLAGS: 00010206
RAX: ffffffff84456d41 RBX: 000000001ffffffd RCX: 0000000000040000
RDX: ffffc9000540c000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffff88823fffffd8 R08: ffffffff84456ce1 R09: 0000000000000000
R10: ffffed103b60375b R11: 0000000000000000 R12: 00000000ffffffec
R13: 38b9190395f5efd8 R14: 00000000026c06e1 R15: 0000000000000000
FS:  00007f7c67adc700(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888240000000 CR3: 0000000194bbc000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lco_csum include/linux/skbuff.h:4546 [inline]
 gre_checksum include/net/gre.h:114 [inline]
 gre_build_header+0x477/0x780 include/net/gre.h:149
 __gre_xmit net/ipv4/ip_gre.c:440 [inline]
 ipgre_xmit+0x6ab/0x9e0 net/ipv4/ip_gre.c:626
 __netdev_start_xmit include/linux/netdevice.h:4506 [inline]
 netdev_start_xmit include/linux/netdevice.h:4520 [inline]
 xmit_one+0xfa/0x470 net/core/dev.c:3203
 dev_hard_start_xmit net/core/dev.c:3219 [inline]
 __dev_queue_xmit+0x14ec/0x2e50 net/core/dev.c:3779
 packet_snd net/packet/af_packet.c:2988 [inline]
 packet_sendmsg+0x4d4d/0x6780 net/packet/af_packet.c:3013
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg net/socket.c:658 [inline]
 ____sys_sendmsg+0x583/0x8c0 net/socket.c:2298
 ___sys_sendmsg net/socket.c:2352 [inline]
 __sys_sendmsg+0x2c4/0x3b0 net/socket.c:2398
 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4665f9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7c67adc188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 0000000020003d40 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffd3ce5c05f R14: 00007f7c67adc300 R15: 0000000000022000
Modules linked in:
CR2: ffff888240000000
---[ end trace ccb640206173f604 ]---
RIP: 0010:do_csum arch/x86/lib/csum-partial_64.c:72 [inline]
RIP: 0010:csum_partial+0x194/0x470 arch/x86/lib/csum-partial_64.c:136
Code: 89 44 24 28 45 31 ff 48 8b 6c 24 08 66 2e 0f 1f 84 00 00 00 00 00 4c 03 6d 00 4c 13 6d 08 4c 13 6d 10 4c 13 6d 18 4c 13 6d 20 <4c> 13 6d 28 4c 13 6d 30 4c 13 6d 38 4d 11 fd 45 85 f6 74 0e 48 83
RSP: 0018:ffff8881f07cf3a8 EFLAGS: 00010206
RAX: ffffffff84456d41 RBX: 000000001ffffffd RCX: 0000000000040000
RDX: ffffc9000540c000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffff88823fffffd8 R08: ffffffff84456ce1 R09: 0000000000000000
R10: ffffed103b60375b R11: 0000000000000000 R12: 00000000ffffffec
R13: 38b9190395f5efd8 R14: 00000000026c06e1 R15: 0000000000000000
FS:  00007f7c67adc700(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888240000000 CR3: 0000000194bbc000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 44 24 28          	mov    %eax,0x28(%rsp)
   4:	45 31 ff             	xor    %r15d,%r15d
   7:	48 8b 6c 24 08       	mov    0x8(%rsp),%rbp
   c:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
  13:	00 00 00
  16:	4c 03 6d 00          	add    0x0(%rbp),%r13
  1a:	4c 13 6d 08          	adc    0x8(%rbp),%r13
  1e:	4c 13 6d 10          	adc    0x10(%rbp),%r13
  22:	4c 13 6d 18          	adc    0x18(%rbp),%r13
  26:	4c 13 6d 20          	adc    0x20(%rbp),%r13
* 2a:	4c 13 6d 28          	adc    0x28(%rbp),%r13 <-- trapping instruction
  2e:	4c 13 6d 30          	adc    0x30(%rbp),%r13
  32:	4c 13 6d 38          	adc    0x38(%rbp),%r13
  36:	4d 11 fd             	adc    %r15,%r13
  39:	45 85 f6             	test   %r14d,%r14d
  3c:	74 0e                	je     0x4c
  3e:	48                   	rex.W
  3f:	83                   	.byte 0x83