BUG: unable to handle kernel NULL pointer dereference at 00000000000000fc
PGD 1ae8b4067 P4D 1ae8b4067 PUD 1bd0b7067 PMD 0 
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 797 Comm: syz-executor3 Not tainted 4.16.0+ #2
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:ffff88019cc57b88 EFLAGS: 00010246
RAX: ffffffff8aedb4f0 RBX: 0000000000000282 RCX: 0000000000000000
RDX: ffffea00002bb6c0 RSI: ffffea00002bb6df RDI: 0000000000000282
RBP: ffff88019cc57bc0 R08: ffff88019a562f38 R09: 0000000000000006
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8aedb4f0 R15: ffffffff88b18760
FS:  000000000244b940(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000fc CR3: 00000001aee9f000 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+0x99/0xe0 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/0x760 mm/slab.c:3552
 getname_flags+0xd0/0x5a0 fs/namei.c:140
 getname fs/namei.c:211 [inline]
 do_symlinkat+0x83/0x2b0 fs/namei.c:4113
 SYSC_symlink fs/namei.c:4143 [inline]
 SyS_symlink+0x22/0x30 fs/namei.c:4141
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x455057
RSP: 002b:0000000000a3eab8 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00000000000003a0 RCX: 0000000000455057
RDX: 0000000000000000 RSI: 00000000004ba7b7 RDI: 0000000000a3f7f0
RBP: 0000000000000013 R08: 0000000000000000 R09: 000000000244b940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000001380
Code: 55 48 89 e5 41 57 49 c7 c7 60 87 b1 88 41 56 41 55 41 54 49 89 f4 53 48 83 ec 10 48 89 7d c8 4d 89 e5 4d 85 e4 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: ffff88019cc57b88
CR2: 00000000000000fc
---[ end trace 7528d055c3c58964 ]---