kasan: CONFIG_KASAN_INLINE enabled
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: 0 PID: 31528 Comm: syz-executor7 Not tainted 4.14.0-rc7+ #71
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c0dea300 task.stack: ffff8801c3958000
RIP: 0010:__list_del_entry_valid+0x7e/0x150 lib/list_debug.c:51
RSP: 0018:ffff8801c395fa88 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8801ce1d2f18 RDI: ffff8801ce1d2f20
RBP: ffff8801c395faa0 R08: ffffffff818d1471 R09: 0000000000000004
R10: ffff8801c395f8f0 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 1ffff1003872bf75 R15: ffff8801ce1d2f18
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7727b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000008370008 CR3: 00000001bb161000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020001000 DR2: 0000000020001000
DR3: 0000000020001020 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del include/linux/list.h:125 [inline]
 unregister_shrinker+0x79/0x300 mm/vmscan.c:301
 deactivate_locked_super+0x64/0xd0 fs/super.c:308
 deactivate_super+0x141/0x1b0 fs/super.c:340
 cleanup_mnt+0xb2/0x150 fs/namespace.c:1173
 __cleanup_mnt+0x16/0x20 fs/namespace.c:1180
 task_work_run+0x199/0x270 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:266 [inline]
 do_syscall_32_irqs_on arch/x86/entry/common.c:335 [inline]
 do_fast_syscall_32+0x83e/0xf05 arch/x86/entry/common.c:391
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7f2bc79
RSP: 002b:00000000f772701c EFLAGS: 00000296 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffea RBX: 0000000020144000 RCX: 0000000020e5a000
RDX: 0000000020638000 RSI: 0000000000000000 RDI: 000000002091cfff
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
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: ffff8801c395fa88
---[ end trace 5ea0d9a35a31ab00 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..