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
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 26857 Comm: syz-executor0 Not tainted 4.9.39-g72a0c9f #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cb47af00 task.stack: ffff8801d8e58000
RIP: 0010:[<ffffffff825dd288>]  [<ffffffff825dd288>] loop_set_fd drivers/block/loop.c:894 [inline]
RIP: 0010:[<ffffffff825dd288>]  [<ffffffff825dd288>] lo_ioctl+0x5a8/0x1990 drivers/block/loop.c:1340
RSP: 0018:ffff8801d8e5fbe8  EFLAGS: 00010206
RAX: 0000000000000036 RBX: dffffc0000000000 RCX: ffffc90007a16000
RDX: 000000000000006e RSI: 0000000000000002 RDI: 00000000000001b0
RBP: ffff8801d8e5fc68 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003b1cbf3e R12: 0000000000000000
R13: ffff8801d4d78000 R14: 0000000000000000 R15: ffff8801ce558b80
FS:  00007fa73b182700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f848f20cdb8 CR3: 000000019a9bb000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801d8e5fe38 ffffffff812ddbb3 ffff8801d8e56000 ffff8801d4d78150
 ffff880100700000 ffff8801d796a600 ffff8801d796a410 ffff8801d5736600
 ffff8801ce558c60 ffff88010002001d ffff8801d4d78158 ffff8801ce558b80
Call Trace:
 [<ffffffff81e580b4>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
 [<ffffffff81e580b4>] blkdev_ioctl+0x494/0x1a30 block/ioctl.c:590
 [<ffffffff8163142e>] block_ioctl+0xde/0x120 fs/block_dev.c:1686
 [<ffffffff815b4774>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b4774>] do_vfs_ioctl+0x194/0x1070 fs/ioctl.c:679
 [<ffffffff815b56df>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b56df>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff83965985>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: 00 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 ee 12 00 00 4d 8b a4 24 f0 00 00 00 49 8d bc 24 b0 01 00 00 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 e4 12 00 00 4d 8b a4 24 b0 01 00 00 4c 89 e0 
RIP  [<ffffffff825dd288>] loop_set_fd drivers/block/loop.c:894 [inline]
RIP  [<ffffffff825dd288>] lo_ioctl+0x5a8/0x1990 drivers/block/loop.c:1340
 RSP <ffff8801d8e5fbe8>
---[ end trace 5335aa9d0b2710ad ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..