BUG: unable to handle kernel NULL pointer dereference in qlist_move

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	BUG: unable to handle kernel NULL pointer dereference in qlist_move_cache (2) tipc				4	2216d	2217d	0/26	closed as invalid on 2018/09/05 11:24
R13: 00007f31c6b52b58 R14: 00000000004b758e R15: 0000000000000000
BUG: unable to handle kernel NULL pointer dereference at 0000000000000014
IP: qlist_put mm/kasan/quarantine.c:63 [inline]
IP: qlist_move_cache+0x4a/0xf0 mm/kasan/quarantine.c:281
PGD 1c16d7067 P4D 1c16d7067 PUD 1c0dac067 PMD 0 
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 4.14.0+ #125
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
task: ffff8801d98e0580 task.stack: ffff8801d98e8000
RIP: 0010:qlist_put mm/kasan/quarantine.c:63 [inline]
RIP: 0010:qlist_move_cache+0x4a/0xf0 mm/kasan/quarantine.c:281
RSP: 0018:ffff8801d98ef078 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 000077ff80000000 RCX: ffff8801b702ecc0
RDX: ffff8801bc9ef480 RSI: ffff8801d98ef098 RDI: ffffffff8728dc78
RBP: ffff8801d98ef088 R08: 0000000000000000 R09: 0000000080000000
R10: 0000000000000000 R11: ffffea0000000000 R12: dead0000000000ff
R13: ffffffff85dccec0 R14: ffffffff87291920 R15: ffff8801bc9ef480
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000014 CR3: 00000001c7d5c000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 quarantine_remove_cache+0x79/0xf0 mm/kasan/quarantine.c:317
 kasan_cache_shutdown+0x9/0x10 mm/kasan/kasan.c:381
 shutdown_cache+0x15/0x1b0 mm/slab_common.c:540
 kmem_cache_destroy+0x236/0x250 mm/slab_common.c:838
 tipc_server_stop+0x13f/0x190 net/tipc/server.c:703
 tipc_topsrv_stop+0x1fe/0x350 net/tipc/subscr.c:390
 tipc_exit_net+0x15/0x40 net/tipc/core.c:96
 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142
 cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:484
 process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2112
 worker_thread+0x223/0x1990 kernel/workqueue.c:2246
 kthread+0x37a/0x440 kernel/kthread.c:238
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:437
Code: 00 00 00 48 c7 47 10 00 00 00 00 49 bb 00 00 00 00 00 ea ff ff 48 89 e5 41 54 53 48 bb 00 00 00 80 ff 77 00 00 eb 27 48 83 3f 00 <8b> 40 14 74 7f 4c 8b 47 08 49 89 08 48 89 4f 08 48 c7 01 00 00 
RIP: qlist_put mm/kasan/quarantine.c:63 [inline] RSP: ffff8801d98ef078
RIP: qlist_move_cache+0x4a/0xf0 mm/kasan/quarantine.c:281 RSP: ffff8801d98ef078
CR2: 0000000000000014
---[ end trace c6312a9ab284d8b4 ]---