BUG: unable to handle kernel NULL pointer dereference at 00000000000000fd
IP: qlist_free_all+0x37/0x160 mm/kasan/quarantine.c:163
PGD 19b215067 P4D 19b215067 PUD 1996de067 PMD 0 
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3222 Comm: udevd Not tainted 4.15.0-rc4+ #227
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:qlist_free_all+0x37/0x160 mm/kasan/quarantine.c:163
RSP: 0018:ffff8801992e7ba8 EFLAGS: 00010246
RAX: ffff8801d8a4a380 RBX: 0000000000000282 RCX: 0000000000000000
RDX: ffffea0007629280 RSI: ffffea000762ee1f RDI: 0000000000000282
RBP: ffff8801992e7be0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffff8801d8a4a380 R15: ffffffff85ec82a0
FS:  00007fb6afc957a0(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000fd CR3: 000000019b963002 CR4: 00000000001626e0
DR0: 0000000020001000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 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
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
 getname_flags+0xcb/0x580 fs/namei.c:138
 user_path_at_empty+0x2d/0x50 fs/namei.c:2590
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xe9/0x190 fs/stat.c:185
 vfs_lstat include/linux/fs.h:3085 [inline]
 SYSC_newlstat+0x87/0xf0 fs/stat.c:350
 SyS_newlstat+0x1d/0x30 fs/stat.c:344
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x7fb6af39cd05
RSP: 002b:00007ffc2cfc9a28 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 0000000001ee7e40 RCX: 00007fb6af39cd05
RDX: 00007ffc2cfc9a70 RSI: 00007ffc2cfc9a70 RDI: 0000000001ebdff0
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fb6af3f2ff0
R10: 00007fb6af3e14c0 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000420298 R14: 00007ffc2cfc63b2 R15: 000000000000000b
Code: 55 48 89 e5 41 57 41 56 41 55 41 54 49 c7 c7 a0 82 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 fc 00 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: ffff8801992e7ba8
CR2: 00000000000000fd
---[ end trace ed89bec8be125714 ]---