BUG: unable to handle kernel NULL pointer dereference at 00000000000000fc
PGD 1ba761067 P4D 1ba761067 PUD 1d4b56067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 18107 Comm: udevd Not tainted 4.19.0-rc8-next-20181019+ #98
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:qlist_free_all+0x30/0x140 mm/kasan/quarantine.c:163
Code: 41 56 41 55 41 54 53 48 83 ec 08 48 8b 1f 48 85 db 0f 84 b0 00 00 00 49 89 f4 48 89 7d d0 4d 85 e4 4d 89 e7 0f 84 c7 00 00 00 <49> 63 87 fc 00 00 00 4c 8b 33 48 29 c3 48 83 3d 03 70 6f 07 00 49
RSP: 0018:ffff8801612ffa80 EFLAGS: 00010246
RAX: ffffea00002b39c0 RBX: ffffffff8ace7be0 RCX: ffffea00002b39c7
RDX: 0000000000000000 RSI: ffffffff8139dd16 RDI: 0000000000000007
RBP: ffff8801612ffab0 R08: ffff8801ce9e8480 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801d9537d00 R14: ffffffff8ace7be0 R15: 0000000000000000
FS:  00007f3c9f1af7a0(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000fc CR3: 00000001c6962000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 quarantine_reduce+0x163/0x1a0 mm/kasan/quarantine.c:259
 kasan_kmalloc+0x9b/0xe0 mm/kasan/kasan.c:538
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 slab_post_alloc_hook mm/slab.h:444 [inline]
 slab_alloc mm/slab.c:3392 [inline]
 kmem_cache_alloc+0x11b/0x730 mm/slab.c:3552
 getname_flags+0xd0/0x590 fs/namei.c:140
 user_path_at_empty+0x2d/0x50 fs/namei.c:2608
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0x129/0x210 fs/stat.c:185
 vfs_stat include/linux/fs.h:3157 [inline]
 __do_sys_newstat+0x8f/0x110 fs/stat.c:339
 __se_sys_newstat fs/stat.c:335 [inline]
 __x64_sys_newstat+0x54/0x80 fs/stat.c:335
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f3c9e8b6c65
Code: 00 00 00 e8 5d 01 00 00 48 83 c4 18 c3 90 90 90 90 90 90 90 90 83 ff 01 48 89 f0 77 18 48 89 c7 48 89 d6 b8 04 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 17 f3 c3 90 48 8b 05 a1 51 2b 00 64 c7 00 16
RSP: 002b:00007ffd00015118 EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 00007ffd000151b0 RCX: 00007f3c9e8b6c65
RDX: 00007ffd00015120 RSI: 00007ffd00015120 RDI: 00007ffd000151b0
RBP: 00000000020dd2d0 R08: 00007ffd000151c0 R09: 00007f3c9e90d790
R10: 00007f3c9e8fb4c0 R11: 0000000000000246 R12: 00000000020dd250
R13: 0000000000000000 R14: 00007ffd00015620 R15: 0000000000000000
Modules linked in:
CR2: 00000000000000fc
---[ end trace 20e19d21050884e5 ]---
RIP: 0010:qlist_free_all+0x30/0x140 mm/kasan/quarantine.c:163
Code: 41 56 41 55 41 54 53 48 83 ec 08 48 8b 1f 48 85 db 0f 84 b0 00 00 00 49 89 f4 48 89 7d d0 4d 85 e4 4d 89 e7 0f 84 c7 00 00 00 <49> 63 87 fc 00 00 00 4c 8b 33 48 29 c3 48 83 3d 03 70 6f 07 00 49
RSP: 0018:ffff8801612ffa80 EFLAGS: 00010246
RAX: ffffea00002b39c0 RBX: ffffffff8ace7be0 RCX: ffffea00002b39c7
RDX: 0000000000000000 RSI: ffffffff8139dd16 RDI: 0000000000000007
RBP: ffff8801612ffab0 R08: ffff8801ce9e8480 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8801d9537d00 R14: ffffffff8ace7be0 R15: 0000000000000000
FS:  00007f3c9f1af7a0(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
kobject: 'loop1' (0000000092904f44): kobject_uevent_env
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004cc400 CR3: 00000001c6962000 CR4: 00000000001406e0
kobject: 'loop1' (0000000092904f44): fill_kobj_path: path = '/devices/virtual/block/loop1'
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kobject: 'loop1' (0000000092904f44): kobject_uevent_env
kobject: 'loop1' (0000000092904f44): fill_kobj_path: path = '/devices/virtual/block/loop1'