RBP: 00007f620c941a90 R08: 00000000207caf71 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b75bb
R13: 00007f620c941bc8 R14: 00000000004b75bb R15: 0000000000000000
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: 5305 Comm: syz-executor1 Not tainted 4.15.0-rc2-mm1+ #39
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0x7e/0x150 lib/list_debug.c:51
RSP: 0018:ffff8801c0fd7b48 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8801c0e95518 RDI: ffff8801c0e95520
RBP: ffff8801c0fd7b60 R08: ffff8801c0fd75c0 R09: ffff8801c0d3c0c0
R10: 000000000000000b R11: ffffed00381faeba R12: 0000000000000000
R13: dffffc0000000000 R14: 1ffff100381faf8d R15: ffff8801c0e95518
FS:  00007f620c942700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020daaffb CR3: 00000001d234a005 CR4: 00000000001606f0
DR0: 0000000020001020 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 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:285
 deactivate_locked_super+0x64/0xd0 fs/super.c:311
 deactivate_super+0x141/0x1b0 fs/super.c:343
 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+0x275/0x2f0 arch/x86/entry/common.c:165
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x94/0x96
RIP: 0033:0x452a09
RSP: 002b:00007f620c941c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffec RBX: 000000000071bea0 RCX: 0000000000452a09
RDX: 0000000020f9effa RSI: 00000000202b9000 RDI: 0000000020b85ff8
RBP: 00000000000003a1 R08: 00000000207caf71 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f27b8
R13: 0000000000000015 R14: 00007f620c9426d4 R15: ffffffffffffffff
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: ffff8801c0fd7b48
---[ end trace cea92956309be31d ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..