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: 0 PID: 13882 Comm: syz-executor3 Not tainted 4.9.122-g54068d6 #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88019cbb3000 task.stack: ffff8801bf608000
RIP: 0010:[<ffffffff825ca92d>]  [<ffffffff825ca92d>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:656
RSP: 0018:ffff8801bf60fae0  EFLAGS: 00010206
RAX: 0000000000000036 RBX: dffffc0000000000 RCX: ffffc90001a8e000
RDX: 00000000000028bd RSI: ffffffff825ca8fd RDI: 00000000000001b0
RBP: ffff8801bf60faf8 R08: ffff88019cbb3910 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003397671d R12: 0000000000000000
R13: ffff8801d9c178c0 R14: ffff8801d9c178c0 R15: ffff8801d395c158
FS:  00007f3994eab700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5e3d944df8 CR3: 00000001d5086000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Stack:
 ffff8801d395c000 ffff8801d314aa00 0000000000000004 ffff8801bf60fb80
 ffffffff825d007d ffffffff8153e2f9 0000004000000009 0000000000930000
 ffff8801d395c018 ffff8801bf60fb80 0000004c0000000b 1ffff10037ec1f6c
Call Trace:
 [<ffffffff825d007d>] loop_change_fd drivers/block/loop.c:702 [inline]
 [<ffffffff825d007d>] lo_ioctl+0x3ed/0x1690 drivers/block/loop.c:1359
 [<ffffffff81e5c426>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
 [<ffffffff81e5c426>] blkdev_ioctl+0x7b6/0x1a70 block/ioctl.c:590
 [<ffffffff816367ee>] block_ioctl+0xde/0x120 fs/block_dev.c:1688
 [<ffffffff815b67dc>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b67dc>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b67dc>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff815b785f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b785f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a00cd3>] 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  [<ffffffff825ca92d>] loop_validate_file+0x20d/0x400 drivers/block/loop.c:656
 RSP <ffff8801bf60fae0>
---[ end trace 3d1e0dc6131b8694 ]---