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: 16264 Comm: syz-executor6 Not tainted 4.9.117-g8b21e85 #71
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cfe81800 task.stack: ffff8801d3448000
RIP: 0010:[<ffffffff825c6bcd>]  [<ffffffff825c6bcd>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:656
RSP: 0018:ffff8801d344fae0  EFLAGS: 00010206
RAX: 0000000000000036 RBX: dffffc0000000000 RCX: ffffc90003f10000
RDX: 000000000000008e RSI: ffffffff825c6b9d RDI: 00000000000001b0
RBP: ffff8801d344faf8 R08: ffff8801cfe82110 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff10039fd041d R12: 0000000000000000
R13: ffff8801d5dc9cc0 R14: ffff8801d5dc9cc0 R15: ffff8801d391c158
FS:  00007f2d4dd64700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc33de9bac CR3: 00000001bda9e000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d391c000 ffff8801b7cb9800 0000000000000014 ffff8801d344fb80
 ffffffff825cc31d[  552.700514] blk_update_request: I/O error, dev loop0, sector 0
blk_update_request: I/O error, dev loop0, sector 255
 ffff8801cfe820e0 ffff8801cfe820b8 ffff8801cfe820e8
 ffff8801d391c018 ffff8801d344fb80 0000004c0000000b 1ffff1003a689f6c
Call Trace:
 [<ffffffff825cc31d>] loop_change_fd drivers/block/loop.c:702 [inline]
 [<ffffffff825cc31d>] lo_ioctl+0x3ed/0x1690 drivers/block/loop.c:1359
 [<ffffffff81e587e6>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
 [<ffffffff81e587e6>] blkdev_ioctl+0x7b6/0x1a70 block/ioctl.c:590
 [<ffffffff816330ee>] block_ioctl+0xde/0x120 fs/block_dev.c:1688
 [<ffffffff815b309c>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b309c>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b309c>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff815b411f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b411f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fcc13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 00 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 f7 01 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 cc 01 00 00 4d 8b a4 24 b0 01 00 00 4c 89 e0 
RIP  [<ffffffff825c6bcd>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:656
 RSP <ffff8801d344fae0>
---[ end trace 90b85ff8443edc83 ]---