BUG: unable to handle kernel paging request in watchdog

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.19	BUG: unable to handle kernel paging request in watchdog				1	1354d	1354d	0/1	auto-closed as invalid on 2020/12/01 23:41

audit: type=1804 audit(1611884466.413:55): pid=13693 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir515602349/syzkaller.pRepL6/1186/file0" dev="sda1" ino=16418 res=1
BUG: unable to handle kernel paging request at fffffffffffffa78
IP: check_hung_uninterruptible_tasks kernel/hung_task.c:187 [inline]
IP: watchdog+0x254/0xb40 kernel/hung_task.c:274
PGD 8e6b067 P4D 8e6b067 PUD 8e6d067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 1518 Comm: khungtaskd Not tainted 4.14.217-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880b2e2e200 task.stack: ffff8880b2e40000
RIP: 0010:check_hung_uninterruptible_tasks kernel/hung_task.c:187 [inline]
RIP: 0010:watchdog+0x254/0xb40 kernel/hung_task.c:274
RSP: 0018:ffff8880b2e47eb0 EFLAGS: 00010246
RAX: 1fffffffffffff4f RBX: fffffffffffffa68 RCX: 1ffffffff11981ac
RDX: 0000000000000000 RSI: ffffffff87ccd700 RDI: fffffffffffffa78
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000020012
R10: ffff8880b2e2ea88 R11: ffff8880b2e2e200 R12: ffff888000116860
R13: 0000000000000000 R14: 00000000003ffe37 R15: ffffffff88e0d980
FS:  0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffa78 CR3: 000000023828e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 45 8d 76 ff 85 c0 0f 85 8f 00 00 00 e9 06 03 00 00 e8 e1 f8 ff ff 48 8d 7b 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 de 07 00 00 <48> 8b 43 10 48 83 f8 02 0f 84 02 02 00 00 e8 b9 f8 ff ff 48 8d 
RIP: check_hung_uninterruptible_tasks kernel/hung_task.c:187 [inline] RSP: ffff8880b2e47eb0
RIP: watchdog+0x254/0xb40 kernel/hung_task.c:274 RSP: ffff8880b2e47eb0
CR2: fffffffffffffa78
---[ end trace a4dce2c157a0cfbb ]---