kernel_thread+0xc6/0xe0 kernel/fork.c:2227
 7259
 create_kthread kernel/kthread.c:270 [inline]
 kthreadd+0x59c/0x900 kernel/kthread.c:589
 7259
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:416
BUG: unable to handle kernel NULL pointer dereference at 00000000000008f4
PGD 80000001b890f067 P4D 80000001b890f067 PUD 1bef31067 PMD 0 
Oops: 0002 [#1] SMP PTI
CPU: 0 PID: 21253 Comm: kworker/u4:21 Not tainted 4.19.0-rc1+ #42
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
Node 0 
Code: 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 01
RSP: 0018:ffff88000dd9fa18 EFLAGS: 00010046
DMA32 free:47932kB min:26324kB low:32904kB high:39484kB active_anon:750740kB inactive_anon:24kB active_file:332kB inactive_file:312kB unevictable:0kB writepending:0kB present:3129332kB managed:2906092kB mlocked:0kB kernel_stack:29760kB pagetables:26060kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
RAX: 0000000000000000 RBX: fffffffffffffff4 RCX: 0000000000000fb0
RDX: 0000000000000fb0 RSI: 0000000000000000 RDI: 00000000000008f4
RBP: ffff88000dd9fa28 R08: ffff88013264d400 R09: 00000000000008f4
R10: 0000000000000000 R11: 000000008040003f R12: 0000000090e00007
R13: 0000000000000000 R14: 0000000000000282 R15: fffffffffffffff4
FS:  0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000b0 CR3: 00000001bae44000 CR4: 00000000001406f0
lowmem_reserve[]:
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000
DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 0
 kmsan_thread_create+0x4b/0x90 mm/kmsan/kmsan_hooks.c:30
 __kthread_create_on_node+0x71b/0x810 kernel/kthread.c:345
 0
 4425
 kthread_create_on_node+0x23f/0x270 kernel/kthread.c:381
 4425
 create_worker+0x4ee/0xfb0 kernel/workqueue.c:1813
 maybe_create_worker kernel/workqueue.c:1972 [inline]
 manage_workers kernel/workqueue.c:2024 [inline]
 worker_thread+0x8d9/0x2590 kernel/workqueue.c:2268
 kthread+0x465/0x4a0 kernel/kthread.c:247
Node 0 
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:416
Normal free:46152kB min:41112kB low:51388kB high:61664kB active_anon:477512kB inactive_anon:440kB active_file:21212kB inactive_file:23636kB unevictable:0kB writepending:144kB present:4718592kB managed:4532152kB mlocked:0kB kernel_stack:25664kB pagetables:21052kB bounce:0kB free_pcp:456kB local_pcp:0kB free_cma:0kB
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 00000000000008f4
---[ end trace d8fe9652f5e6a842 ]---
RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65
Code: 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 01
lowmem_reserve[]:
RSP: 0018:ffff88000dd9fa18 EFLAGS: 00010046
RAX: 0000000000000000 RBX: fffffffffffffff4 RCX: 0000000000000fb0
RDX: 0000000000000fb0 RSI: 0000000000000000 RDI: 00000000000008f4
RBP: ffff88000dd9fa28 R08: ffff88013264d400 R09: 00000000000008f4
R10: 0000000000000000 R11: 000000008040003f R12: 0000000090e00007
R13: 0000000000000000 R14: 0000000000000282 R15: fffffffffffffff4
FS:  0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
 0
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000b0 CR3: 00000001bae44000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000
DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600