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: 16273 Comm: syz-executor1 Not tainted 4.14.0+ #105
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801846e0340 task.stack: ffff8801d5728000
RIP: 0010:bdev_get_queue include/linux/blkdev.h:994 [inline]
RIP: 0010:bdev_logical_block_size include/linux/blkdev.h:1432 [inline]
RIP: 0010:bd_set_size+0x5f/0x330 fs/block_dev.c:1383
RSP: 0018:ffff8801d572fad8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81be353c
RDX: 00000000000000bf RSI: ffffc9000440e000 RDI: 00000000000005f8
RBP: ffff8801d572fb08 R08: 1ffff1003aae5f00 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d6a29740
R13: 0000000000000000 R14: ffff8801cc495200 R15: ffff8801cc495558
FS:  0000000000000000(0000) GS:ffff8801db400000(0063) knlGS:00000000f7785b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007f8c8b782000 CR3: 00000001904ea000 CR4: 00000000001406f0
Call Trace:
 loop_clr_fd+0x4fc/0xb50 drivers/block/loop.c:1053
 lo_ioctl+0x131f/0x1b90 drivers/block/loop.c:1365
 lo_compat_ioctl+0xab/0x140 drivers/block/loop.c:1556
 compat_blkdev_ioctl+0x3ba/0x1850 block/compat_ioctl.c:406
 C_SYSC_ioctl fs/compat_ioctl.c:1473 [inline]
 compat_SyS_ioctl+0x151/0x2a30 fs/compat_ioctl.c:1419
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7f89c79
RSP: 002b:00000000f778501c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000000004c01
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 03 80 3c 02 00 0f 85 c6 02 00 00 49 8b 9c 24 f0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb f8 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 76 02 00 00 4d 8d 74 24 08 48 b8 00 00 00 00 
RIP: bdev_get_queue include/linux/blkdev.h:994 [inline] RSP: ffff8801d572fad8
RIP: bdev_logical_block_size include/linux/blkdev.h:1432 [inline] RSP: ffff8801d572fad8
RIP: bd_set_size+0x5f/0x330 fs/block_dev.c:1383 RSP: ffff8801d572fad8
---[ end trace 6564d902c5739ac4 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..