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: 2 PID: 5398 Comm: syz-executor4 Not tainted 4.14.0-rc5-next-20171018+ #8
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff8800590de700 task.stack: ffff8800570d8000
RIP: 0010:__list_del_entry_valid+0x7e/0x150 lib/list_debug.c:51
RSP: 0018:ffff8800570df9d8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88006cc10c98 RDI: ffff88006cc10ca0
RBP: ffff8800570df9f0 R08: ffffffff81cc0502 R09: 0000000000000004
R10: ffff8800570df9f0 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88005a260700 R14: ffff8800570dfa80 R15: ffff88006cc10c98
FS:  00007fccf6ffa700(0000) GS:ffff88006de00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020f3f000 CR3: 0000000058845000 CR4: 00000000000026e0
Call Trace:
 __list_del_entry include/linux/list.h:116 [inline]
 list_del include/linux/list.h:124 [inline]
 kernfs_kill_sb+0x9e/0x330 fs/kernfs/mount.c:361
 sysfs_kill_sb+0x22/0x40 fs/sysfs/mount.c:53
 deactivate_locked_super+0x88/0xd0 fs/super.c:308
 kernfs_mount_ns+0x717/0x8b0 fs/kernfs/mount.c:335
 sysfs_mount+0xc2/0x1c0 fs/sysfs/mount.c:39
 mount_fs+0x66/0x2d0 fs/super.c:1222
 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037
 vfs_kern_mount fs/namespace.c:2509 [inline]
 do_new_mount fs/namespace.c:2512 [inline]
 do_mount+0xea1/0x2bb0 fs/namespace.c:2841
 SYSC_mount fs/namespace.c:3057 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3034
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x447c89
RSP: 002b:00007fccf6ff9bd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fccf6ffa6cc RCX: 0000000000447c89
RDX: 00000000204b2000 RSI: 00000000205d6000 RDI: 0000000020622000
RBP: 0000000000000082 R08: 0000000020f3efff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a9574
R13: 00007fccf6ff9b38 R14: 0000000000000001 R15: 00007fccf6ffa700
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: ffff8800570df9d8
---[ end trace c9710688194c1397 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..