BUG: unable to handle kernel NULL pointer dereference at 0000000000000105
IP: qlist_free_all+0x37/0x160 mm/kasan/quarantine.c:163
PGD 1baa8a067 P4D 1baa8a067 PUD 1baa88067 PMD 0 
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 23355 Comm: syz-executor2 Not tainted 4.14.0+ #125
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c7c9a180 task.stack: ffff8801b6c90000
RIP: 0010:qlist_free_all+0x37/0x160 mm/kasan/quarantine.c:163
RSP: 0018:ffff8801b6c97000 EFLAGS: 00010246
RAX: ffff8801cdd72d40 RBX: 0000000000000282 RCX: 0000000000000000
RDX: ffffea0007375c80 RSI: ffffea0007554e1f RDI: 0000000000000282
RBP: ffff8801b6c97038 R08: 1ffff10036d92dce R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffff8801cdd72d40 R15: ffffffff85ccb980
FS:  00000000014c4940(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000105 CR3: 00000001c6c94000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3562
 dup_mmap kernel/fork.c:653 [inline]
 dup_mm kernel/fork.c:1201 [inline]
 copy_mm+0x8d7/0x1310 kernel/fork.c:1255
 copy_process.part.36+0x1eae/0x4af0 kernel/fork.c:1757
 copy_process kernel/fork.c:1570 [inline]
 _do_fork+0x1ef/0xff0 kernel/fork.c:2049
 SYSC_clone kernel/fork.c:2159 [inline]
 SyS_clone+0x37/0x50 kernel/fork.c:2153
 do_syscall_64+0x26c/0x920 arch/x86/entry/common.c:285
 entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x450faa
RSP: 002b:0000000000a6f9e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000a6f9e0 RCX: 0000000000450faa
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000a6fa20 R08: 0000000000000001 R09: 00000000014c4940
R10: 00000000014c4c10 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000016
Code: 55 48 89 e5 41 57 41 56 41 55 41 54 49 c7 c7 80 b9 cc 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: ffff8801b6c97000
CR2: 0000000000000105
BUG: unable to handle kernel NULL pointer dereference at 0000000000000104
---[ end trace 42b7d0aafdc207a4 ]---