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: 1 PID: 17861 Comm: syz-executor1 Not tainted 4.14.0-rc4+ #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d5036540 task.stack: ffff8801c62f0000
RIP: 0010:loop_set_fd drivers/block/loop.c:885 [inline]
RIP: 0010:lo_ioctl+0x672/0x1b70 drivers/block/loop.c:1353
RSP: 0018:ffff8801c62f7b70 EFLAGS: 00010202
RAX: 0000000000010000 RBX: dffffc0000000000 RCX: ffffc90003b7c000
RDX: 0000000000000037 RSI: ffffffff8353a8e2 RDI: 00000000000001b8
RBP: ffff8801c62f7be8 R08: 0000000000000001 R09: 1ffff10038c5ef1f
R10: ffff8801c62f78c0 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801d5c51240 R14: ffff8801d15a97c0 R15: ffff8801d5c51390
FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f770eb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020520fd0 CR3: 00000001d5383000 CR4: 00000000001406e0
Call Trace:
 lo_compat_ioctl+0xab/0x140 drivers/block/loop.c:1551
 compat_blkdev_ioctl+0x3ae/0x1840 block/compat_ioctl.c:405
 C_SYSC_ioctl fs/compat_ioctl.c:1593 [inline]
 compat_SyS_ioctl+0x1d7/0x3290 fs/compat_ioctl.c:1540
 do_syscall_32_irqs_on arch/x86/entry/common.c:329 [inline]
 do_fast_syscall_32+0x3f2/0xf05 arch/x86/entry/common.c:391
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124
RIP: 0023:0xf7f12c79
RSP: 002b:00000000f770e05c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 0000000000004c00
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 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: ffff8801c62f7b70
RIP: lo_ioctl+0x672/0x1b70 drivers/block/loop.c:1353 RSP: ffff8801c62f7b70
---[ end trace 93da0d51d237da9a ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..