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: 23959 Comm: syz-executor7 Not tainted 4.14.0-rc2-next-20170926+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88019a2ec100 task.stack: ffff8801c79a8000
RIP: 0010:__list_del_entry_valid+0x7e/0x150 lib/list_debug.c:51
RSP: 0018:ffff8801c79af1b8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88019f75f0d8 RDI: ffff88019f75f0e0
RBP: ffff8801c79af1d0 R08: ffff8801c79aeab8 R09: ffff8801c79aeab0
R10: ffff8801c79aea28 R11: 1ffff1003345dab3 R12: 0000000000000000
R13: dffffc0000000000 R14: 1ffff10038f35e5b R15: ffff88019f75f0d8
FS:  00007fabeef65700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002001d000 CR3: 00000001d975a000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
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:1171
 mntput_no_expire+0x6e0/0xa90 fs/namespace.c:1235
 mntput fs/namespace.c:1245 [inline]
 kern_unmount+0x9c/0xd0 fs/namespace.c:2996
 mq_put_mnt+0x37/0x50 ipc/mqueue.c:1609
 put_ipc_ns+0x4d/0x150 ipc/namespace.c:162
 free_nsproxy+0xc0/0x1f0 kernel/nsproxy.c:180
 switch_task_namespaces+0x9d/0xc0 kernel/nsproxy.c:229
 exit_task_namespaces+0x17/0x20 kernel/nsproxy.c:234
 do_exit+0x9c3/0x1b00 kernel/exit.c:864
 do_group_exit+0x149/0x400 kernel/exit.c:968
 get_signal+0x73f/0x16d0 kernel/signal.c:2334
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath+0x42f/0x510 arch/x86/entry/common.c:266
 entry_SYSCALL_64_fastpath+0xbc/0xbe
RIP: 0033:0x4520a9
RSP: 002b:00007fabeef64cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 0000000000718028 RCX: 00000000004520a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000718028
RBP: 0000000000718000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a6f7ef R14: 00007fabeef659c0 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: ffff8801c79af1b8
---[ end trace 1b5af5cd39dd72ca ]---