kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3063 Comm: syz-executor2 Not tainted 4.13.0-rc5-next-20170817+ #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88006d188680 task.stack: ffff88006a368000
RIP: 0010:__list_del_entry_valid+0x7e/0x150 lib/list_debug.c:51
RSP: 0000:ffff88006a36fb30 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff880039cc9198 RDI: ffff880039cc91a0
RBP: ffff88006a36fb48 R08: ffffffff818c4b61 R09: 0000000000000000
R10: ffff88006a36f998 R11: ffffffff85b96fa0 R12: 0000000000000000
R13: dffffc0000000000 R14: 1ffff1000d46df8a R15: ffff880039cc9198
FS:  000000000293b940(0000) GS:ffff88003ed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000201dd000 CR3: 00000000691c4000 CR4: 00000000000026e0
Call Trace:
 __list_del_entry include/linux/list.h:116 [inline]
 list_del include/linux/list.h:124 [inline]
 unregister_shrinker+0x79/0x300 mm/vmscan.c:300
 deactivate_locked_super+0x64/0xd0 fs/super.c:307
 deactivate_super+0x141/0x1b0 fs/super.c:339
 cleanup_mnt+0xb2/0x150 fs/namespace.c:1113
 __cleanup_mnt+0x16/0x20 fs/namespace.c:1120
 task_work_run+0x199/0x270 kernel/task_work.c:112
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x2a6/0x300 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266
 entry_SYSCALL_64_fastpath+0xbc/0xbe
RIP: 0033:0x448b97
RSP: 002b:0000000000a5d828 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000063 RCX: 0000000000448b97
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000a5e9c0
RBP: 0000000000a5e9c0 R08: 0000000000000000 R09: 0000000002945d33
R10: 0000000000000005 R11: 0000000000000206 R12: 0000000002945cc0
R13: 0000000000000002 R14: 0000000000000003 R15: 0000000000000065
Code: 00 00 00 00 ad de 49 39 c4 74 66 48 b8 00 02 00 00 00 00 ad de 48 89 da 48 39 c3 74 65 48 c1 ea 03 48 b8 00 00 00 00 00 fc ff df <80> 3c 02 00 75 7b 48 8b 13 48 39 f2 75 57 49 8d 7c 24 08 48 b8 
RIP: __list_del_entry_valid+0x7e/0x150 lib/list_debug.c:51 RSP: ffff88006a36fb30
---[ end trace 9a6e322a3a52c183 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled