BUG: unable to handle kernel NULL pointer dereference at 000000000000010e
IP: qlist_free_all+0x37/0x160 mm/kasan/quarantine.c:163
PGD 1c2c89067 P4D 1c2c89067 PUD 1c38da067 PMD 0 
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 6829 Comm: syz-executor1 Not tainted 4.14.0+ #104
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d0a64200 task.stack: ffff8801bf2d0000
RIP: 0010:qlist_free_all+0x37/0x160 mm/kasan/quarantine.c:163
RSP: 0000:ffff8801bf2d7578 EFLAGS: 00010246
RAX: ffff880100400088 RBX: 0000000000000286 RCX: 0000000000000000
RDX: ffffea0004010000 RSI: ffffea000400001f RDI: 0000000000000286
RBP: ffff8801bf2d75b0 R08: 1ffff10037e5ae7d R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000000a R14: ffff880100400088 R15: ffffffff85ecb5c0
FS:  0000000000000000(0000) GS:ffff8801db500000(0063) knlGS:0000000009ad6900
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000000010e CR3: 00000001c5b9e000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020001020
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 quarantine_reduce+0x141/0x170 mm/kasan/quarantine.c:259
 kasan_kmalloc+0xca/0xe0 mm/kasan/kasan.c:536
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc mm/slab.c:3385 [inline]
 kmem_cache_alloc+0x11b/0x760 mm/slab.c:3545
 ptlock_alloc+0x24/0x70 mm/memory.c:4685
 ptlock_init include/linux/mm.h:1776 [inline]
 pgtable_page_ctor include/linux/mm.h:1810 [inline]
 pte_alloc_one+0x59/0x100 arch/x86/mm/pgtable.c:32
 __do_huge_pmd_anonymous_page mm/huge_memory.c:564 [inline]
 do_huge_pmd_anonymous_page+0x554/0x1b00 mm/huge_memory.c:728
 create_huge_pmd mm/memory.c:3828 [inline]
 __handle_mm_fault+0x1904/0x3ad0 mm/memory.c:4031
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4097
 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1429
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1504
 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1088
RIP: 0023:0x804a4b1
RSP: 002b:000000000847f8f0 EFLAGS: 00010246
RAX: 0000000020002000 RBX: 0000000000000000 RCX: 0000000009357861
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 55 48 89 e5 41 57 41 56 41 55 41 54 49 c7 c7 c0 b5 ec 85 53 49 89 f4 48 83 ec 10 48 89 7d c8 4d 85 e4 4d 89 e5 0f 84 c8 00 00 00 <49> 63 95 04 01 00 00 4c 8b 30 48 29 d0 49 83 3f 00 48 89 c6 0f 
RIP: qlist_free_all+0x37/0x160 mm/kasan/quarantine.c:163 RSP: ffff8801bf2d7578
CR2: 000000000000010e
---[ end trace 604dfad79dac2d85 ]---