_do_fork+0x353/0xf60 kernel/fork.c:2089
 kernel_thread+0xc6/0xe0 kernel/fork.c:2148
 create_kthread kernel/kthread.c:264 [inline]
 kthreadd+0x5df/0x940 kernel/kthread.c:563
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:413
BUG: unable to handle kernel NULL pointer dereference at 00000000000008cc
PGD 80000001c2691067 P4D 80000001c2691067 PUD 1c2694067 PMD 0 
Oops: 0002 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 1126 Comm: kworker/1:1 Not tainted 4.17.0+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65
RSP: 0018:ffff8801d83dfa50 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8801d8000000 RCX: 0000000000000fb0
RDX: 0000000000000fb0 RSI: 0000000000000000 RDI: 00000000000008cc
RBP: ffff8801d83dfa80 R08: 0000000000000000 R09: 00000000000008cc
R10: 0000000000000000 R11: ffffffff813553c0 R12: ffff8801d80008d8
R13: 0000000000000000 R14: 0000000000000282 R15: fffffffffffffff4
FS:  0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000b0 CR3: 00000001b5454000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __kthread_create_on_node+0x6ba/0x7b0 kernel/kthread.c:333
 kthread_create_on_node+0x243/0x270 kernel/kthread.c:369
 create_worker+0x7c6/0x1000 kernel/workqueue.c:1811
 maybe_create_worker kernel/workqueue.c:1970 [inline]
 manage_workers kernel/workqueue.c:2022 [inline]
 worker_thread+0x876/0x24f0 kernel/workqueue.c:2251
 kthread+0x4db/0x6c0 kernel/kthread.c:241
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:413
Code: 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 
RIP: memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65 RSP: ffff8801d83dfa50
CR2: 00000000000008cc
---[ end trace c1915eba1ea75ecd ]---