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: 14239 Comm: syz-executor2 Not tainted 4.13.0-next-20170905+ #15
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88003d858100 task.stack: ffff88001e4c0000
RIP: 0010:__list_del_entry_valid+0x7e/0x150 lib/list_debug.c:51
RSP: 0018:ffff88001e4c79d8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88001d800298 RDI: ffff88001d8002a0
RBP: ffff88001e4c79f0 R08: ffffffff81ca26c2 R09: ffff88001e4c6f40
R10: ffff88001e4c79f0 R11: 1ffff10007b0b2b3 R12: 0000000000000000
R13: ffff880039948840 R14: ffff88001e4c7a80 R15: ffff88001d800298
FS:  00007f09adc2b700(0000) GS:ffff88003ed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c6e84 CR3: 000000003e3f4000 CR4: 00000000000006e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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.25+0xc6/0x4a0 fs/namespace.c:1035
 vfs_kern_mount fs/namespace.c:2509 [inline]
 do_new_mount fs/namespace.c:2512 [inline]
 do_mount+0x400/0x2b70 fs/namespace.c:2834
 SYSC_mount fs/namespace.c:3050 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3027
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x447299
RSP: 002b:00007f09adc2ac08 EFLAGS: 00000292 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000205c2000 RCX: 0000000000447299
RDX: 00000000204a9000 RSI: 00000000207fbff8 RDI: 00000000205c2000
RBP: 0000000000000082 R08: 0000000020963000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 00000000004a8bf7
R13: 0000000000000000 R14: 00007f09adc2a9c8 R15: 00007f09adc2ab38
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: ffff88001e4c79d8
---[ end trace 049793018dc5c691 ]---