BUG: unable to handle kernel paging request at fffffffffffffc54
PGD 9e6e067 P4D 9e6e067 PUD 9e70067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4812 Comm: syz-executor.4 Not tainted 4.19.204-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:mm_update_next_owner+0x376/0x650 kernel/exit.c:450
Code: c6 29 00 48 8d bd 54 fc ff ff 48 89 f8 48 c1 e8 03 0f b6 14 18 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 26 02 00 00 <44> 8b ad 54 fc ff ff 31 ff 41 81 e5 00 00 20 00 44 89 ee e8 32 c7
RSP: 0018:ffff888227327d50 EFLAGS: 00010246
RAX: 0000000000000007 RBX: dffffc0000000000 RCX: ffffffff8138ccce
RDX: 0000000000000000 RSI: ffffffff8138cc8f RDI: fffffffffffffc54
RBP: 0000000000000000 R08: ffff888000134860 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff888044785240
R13: ffff8880a5ada850 R14: ffff88803b57a580 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffc54 CR3: 00000000b4ce8000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 exit_mm kernel/exit.c:548 [inline]
 do_exit+0xae4/0x2be0 kernel/exit.c:857
 do_group_exit+0x125/0x310 kernel/exit.c:967
 __do_sys_exit_group kernel/exit.c:978 [inline]
 __se_sys_exit_group kernel/exit.c:976 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:976
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4665e9
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:00007ffe06c54898 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00000000004665e9
RDX: 00000000004193fb RSI: ffffffffffffffbc RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffe06c54990
Modules linked in:
CR2: fffffffffffffc54
---[ end trace b02e3d5c1b8c93c9 ]---
RIP: 0010:mm_update_next_owner+0x376/0x650 kernel/exit.c:450
Code: c6 29 00 48 8d bd 54 fc ff ff 48 89 f8 48 c1 e8 03 0f b6 14 18 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 26 02 00 00 <44> 8b ad 54 fc ff ff 31 ff 41 81 e5 00 00 20 00 44 89 ee e8 32 c7
RSP: 0018:ffff888227327d50 EFLAGS: 00010246
RAX: 0000000000000007 RBX: dffffc0000000000 RCX: ffffffff8138ccce
RDX: 0000000000000000 RSI: ffffffff8138cc8f RDI: fffffffffffffc54
RBP: 0000000000000000 R08: ffff888000134860 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff888044785240
R13: ffff8880a5ada850 R14: ffff88803b57a580 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffc54 CR3: 00000000b4ce8000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	29 00                	sub    %eax,(%rax)
   2:	48 8d bd 54 fc ff ff 	lea    -0x3ac(%rbp),%rdi
   9:	48 89 f8             	mov    %rdi,%rax
   c:	48 c1 e8 03          	shr    $0x3,%rax
  10:	0f b6 14 18          	movzbl (%rax,%rbx,1),%edx
  14:	48 89 f8             	mov    %rdi,%rax
  17:	83 e0 07             	and    $0x7,%eax
  1a:	83 c0 03             	add    $0x3,%eax
  1d:	38 d0                	cmp    %dl,%al
  1f:	7c 08                	jl     0x29
  21:	84 d2                	test   %dl,%dl
  23:	0f 85 26 02 00 00    	jne    0x24f
* 29:	44 8b ad 54 fc ff ff 	mov    -0x3ac(%rbp),%r13d <-- trapping instruction
  30:	31 ff                	xor    %edi,%edi
  32:	41 81 e5 00 00 20 00 	and    $0x200000,%r13d
  39:	44 89 ee             	mov    %r13d,%esi
  3c:	e8                   	.byte 0xe8
  3d:	32 c7                	xor    %bh,%al