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: 12787 Comm: syz-executor2 Not tainted 4.14.0-rc5+ #136
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cd496380 task.stack: ffff8801cd428000
RIP: 0010:loop_set_fd drivers/block/loop.c:885 [inline]
RIP: 0010:lo_ioctl+0x672/0x1b70 drivers/block/loop.c:1353
loop_reread_partitions: partition scan of loop0 () failed (rc=-13)
RSP: 0018:ffff8801cd42faa0 EFLAGS: 00010202
RAX: 0000000000010000 RBX: dffffc0000000000 RCX: ffffc90003aa2000
RDX: 0000000000000037 RSI: ffffffff8353a8e2 RDI: 00000000000001b8
RBP: ffff8801cd42fb18 R08: 0000000000000001 R09: 1ffff10039a85f05
R10: ffff8801cd42f7f0 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801d5c03b40 R14: ffff8801d1551140 R15: ffff8801d5c03c90
FS:  00007fa3b59b4700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006ef468 CR3: 00000001cac4d000 CR4: 00000000001426f0
Call Trace:
 __blkdev_driver_ioctl block/ioctl.c:297 [inline]
 blkdev_ioctl+0xc07/0x1de0 block/ioctl.c:594
 block_ioctl+0xde/0x120 fs/block_dev.c:1872
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452779
RSP: 002b:00007fa3b59b3be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452779
RDX: 0000000000000013 RSI: 0000000000004c00 RDI: 0000000000000015
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3cf8
R13: 00000000ffffffff R14: 0000000000758090 R15: 0000000000000000
Code: 00 00 00 48 89 fa 48 c1 ea 03 80 3c 1a 00 0f 85 6f 14 00 00 4d 8b a4 24 f0 00 00 00 49 8d bc 24 b8 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 44 14 00 00 4d 8b a4 24 b8 01 00 00 4c 89 e2 
RIP: loop_set_fd drivers/block/loop.c:885 [inline] RSP: ffff8801cd42faa0
RIP: lo_ioctl+0x672/0x1b70 drivers/block/loop.c:1353 RSP: ffff8801cd42faa0
---[ end trace 9e7baafc54b00052 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..