audit: type=1326 audit(1508718403.376:1864): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=21273 comm="syz-executor5" exe="/root/syz-executor5" sig=0 arch=c000003e syscall=127 compat=0 ip=0x452719 code=0x7ffc0000
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: 21297 Comm: syz-executor6 Not tainted 4.14.0-rc5-next-20171018+ #36
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c2ec2400 task.stack: ffff8801c53a8000
RIP: 0010:loop_set_fd drivers/block/loop.c:890 [inline]
RIP: 0010:lo_ioctl+0x672/0x1b70 drivers/block/loop.c:1358
RSP: 0018:ffff8801c53afaa0 EFLAGS: 00010202
RAX: 0000000000010000 RBX: dffffc0000000000 RCX: ffffffff8365b372
RDX: 0000000000000037 RSI: ffffc9000138c000 RDI: 00000000000001b8
RBP: ffff8801c53afb18 R08: 0000000000000001 R09: 1ffff10038a75f05
R10: ffff8801c53af7f0 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801d5d14900 R14: ffff8801d162b800 R15: ffff8801d5d14a50
FS:  00007f1e6e3c7700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002001d000 CR3: 00000001c1e87000 CR4: 00000000001426f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
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:1860
 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: 0033:0x452719
RSP: 002b:00007f1e6e3c6be8 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452719
RDX: 0000000000000015 RSI: 0000000000004c00 RDI: 0000000000000014
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a6f7ff R14: 00007f1e6e3c79c0 R15: 0000000000000027
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:890 [inline] RSP: ffff8801c53afaa0
RIP: lo_ioctl+0x672/0x1b70 drivers/block/loop.c:1358 RSP: ffff8801c53afaa0
---[ end trace 2076ab2649a838f3 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..