Authentication bypass after screen lock

This occurs when I try to change the language to type password.

 1) Lock the unity screen with Super+L.
 2) Try to change Keyboard layout more than 20 times.
 3) Log in system without password.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity 7.4.0+16.04.20160715-0ubuntu1
Uname: Linux 4.7.0-999-generic x86_64
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Это каталог: '/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 367.35 Mon Jul 11 23:14:21 PDT 2016
 GCC version: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.1)
.tmp.unity_support_test.0:

ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Wed Aug 3 20:29:44 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.8, 4.4.0-31-generic, x86_64: installed
 bbswitch, 0.8, 4.7.0-999-generic, x86_64: installed
 nvidia-367, 367.35, 4.7.0-999-generic, x86_64: installed
 rtlwifi-new, 0.10, 4.4.0-31-generic, x86_64: installed
 virtualbox, 5.0.24: added
EcryptfsInUse: Yes
GraphicsCard:
 Intel Corporation Skylake Integrated Graphics [8086:191b] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Skylake Integrated Graphics [103c:80a9]
   Subsystem: Hewlett-Packard Company GM107M [GeForce GTX 950M] [103c:80a9]
InstallationDate: Installed on 2016-08-02 (1 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 0bda:b006 Realtek Semiconductor Corp.
 Bus 001 Device 003: ID 04f2:b50d Chicony Electronics Co., Ltd
 Bus 001 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP Pavilion Gaming Notebook
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.7.0-999-generic root=UUID=a2dd2e05-1477-412f-a3c6-92b1382c0648 ro quiet splash pci=nomsi vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/14/2016
dmi.bios.vendor: Insyde
dmi.bios.version: F.79
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 80A9
dmi.board.vendor: HP
dmi.board.version: 91.1D
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.79:bd04/14/2016:svnHP:pnHPPavilionGamingNotebook:pvrType1ProductConfigId:rvnHP:rn80A9:rvr91.1D:cvnHP:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion Gaming Notebook
dmi.product.version: Type1ProductConfigId
dmi.sys.vendor: HP
version.compiz: compiz 1:0.9.12.2+16.04.20160714-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Wed Aug 3 20:29:06 2016
xserver.configfile: default
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
 [drm] Failed to open DRM device for (null): -22
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 1203
 vendor LGD
xserver.version: 2:1.18.3-1ubuntu2.2