kobject: 'iosched' (ffff8801190df250): kobject_add_internal: parent: 'queue', set: '<NULL>'
kobject: 'iosched' (ffff8801190df250): kobject_uevent_env
kobject: 'iosched' (ffff8801190df250): kobject_uevent_env: filter function caused the event to drop!
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 6710 Comm: syz-executor.3 Not tainted 4.12.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88011c750000 task.stack: ffff880117c78000
RIP: 0010:sysfs_do_create_link_sd.isra.2+0x48/0xf0 fs/sysfs/symlink.c:35
RSP: 0018:ffff880117c7f9b0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffffff875a07a0 RCX: 0000000000000000
RDX: 0000000000000008 RSI: ffff88011c750888 RDI: ffffffff88411c04
RBP: ffff880117c7f9d8 R08: ffff88011c7508a8 R09: 000000000000000c
R10: ffff88011c750888 R11: ffff88011c750000 R12: ffff88011b0c0aa0
R13: 0000000000000040 R14: 0000000000000001 R15: ffff8801190daf60
FS:  00007f1fd4470700(0000) GS:ffff88012c000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcbf986c18 CR3: 000000010859d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sysfs_do_create_link fs/sysfs/symlink.c:80 [inline]
 sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92
 device_add_disk+0xafd/0xf50 block/genhd.c:631
 add_disk include/linux/genhd.h:404 [inline]
 loop_add+0x612/0x8c0 drivers/block/loop.c:1845
 loop_control_ioctl+0x278/0x430 drivers/block/loop.c:1942
 vfs_ioctl fs/ioctl.c:45 [inline]
 file_ioctl fs/ioctl.c:499 [inline]
 do_vfs_ioctl+0x183/0x15a0 fs/ioctl.c:683
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x74/0x80 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x23/0xc2
RIP: 0033:0x459829
RSP: 002b:00007f1fd446fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1fd446fc90 RCX: 0000000000459829
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1fd44706d4
R13: 00000000004c871d R14: 00000000004df438 R15: 00000000ffffffff
Code: 41 55 49 89 f5 41 54 49 89 fc 48 c7 c7 00 1c 41 88 53 48 89 d3 e8 e9 55 36 05 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 86 00 00 00 4d 8b 6d 00 4d 85 ed 74 52 4c 89 
RIP: sysfs_do_create_link_sd.isra.2+0x48/0xf0 fs/sysfs/symlink.c:35 RSP: ffff880117c7f9b0
---[ end trace f1d897357896ea32 ]---