BUG: unable to handle kernel NULL pointer dereference at 00000000000000fd
IP: qlist_free_all+0x37/0x160 mm/kasan/quarantine.c:163
PGD 183f4f067 P4D 183f4f067 PUD 183f50067 PMD 0 
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4381 Comm: syz-executor2 Not tainted 4.16.0-rc7+ #7
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:ffff880183f97980 EFLAGS: 00010246
RAX: ffff88017cec6240 RBX: 0000000000000282 RCX: 0000000000000000
RDX: ffffea0005f3b180 RSI: ffffea00070e0a1f RDI: 0000000000000282
RBP: ffff880183f979b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88017cec6240 R15: ffffffff88512760
FS:  00000000029e9940(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000fd CR3: 0000000183f4e005 CR4: 00000000001606f0
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:537
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 slab_post_alloc_hook mm/slab.h:443 [inline]
 slab_alloc mm/slab.c:3380 [inline]
 kmem_cache_alloc+0x11b/0x760 mm/slab.c:3540
 sock_alloc_inode+0x70/0x300 net/socket.c:244
 alloc_inode+0x65/0x180 fs/inode.c:209
 new_inode_pseudo+0x69/0x190 fs/inode.c:890
 sock_alloc+0x41/0x270 net/socket.c:565
 __sock_create+0x148/0x850 net/socket.c:1249
 sock_create net/socket.c:1325 [inline]
 SYSC_socket net/socket.c:1355 [inline]
 SyS_socket+0xeb/0x1d0 net/socket.c:1335
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4579a7
RSP: 002b:00007fff8de62168 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00000000004579a7
RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 00000000006ffec0 R08: 0000000000006000 R09: 0000000000004000
R10: 00007fff8de62fa0 R11: 0000000000000246 R12: 0000000000000013
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000001380
Code: 55 48 89 e5 41 57 41 56 41 55 41 54 49 c7 c7 60 27 51 88 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: ffff880183f97980
CR2: 00000000000000fd
---[ end trace 340761bdb0787350 ]---