Собираю Gentoo, ошибка монтирования раздела

        menuentry 'Gentoo GNU/Linux, с Linux 4.8.0-pf1' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.8.0-pf1-advanced-90da3a$
                load_video
                if [ "x$grub_platform" = xefi ]; then
                        set gfxpayload=keep
                fi
                insmod gzio
                insmod part_msdos
                insmod btrfs
                set root='hd0,msdos7'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos7 --hint-efi=hd0,msdos7 --hint-baremetal=ahci0,msdos7  90da3acb-0f99-4995-ad30-e0c861e65d$
                else
                  search --no-floppy --fs-uuid --set=root 90da3acb-0f99-4995-ad30-e0c861e65d09
                fi
                echo    'Загружается Linux 4.8.0-pf1 …'
                linux   /root/boot/vmlinuz-4.8.0-pf1 root=UUID=90da3acb-0f99-4995-ad30-e0c861e65d09 ro rootflags=subvol=root init=/usr/lib/systemd/systemd
                echo    'Загружается начальный виртуальный диск …'
                initrd  /root/boot/initramfs-genkernel-x86_64-4.8.0-pf1

# Configuration file for genkernel

# This file is sourced by genkernel at startup and determines which options
# we will be using to compile our kernel.  The order of precidence is simple,
# with the internal settings being least important, configuration file
# settings next, and command line options being most important.

# =========Common Command Line Option Defaults=========

# Should we install to $BOOTDIR?  Default is "no" because genkernel is used in
# catalyst and stage building.
INSTALL="yes"

# Run 'make oldconfig' before compiling this kernel?
OLDCONFIG="no"

# Run 'make menuconfig' before compiling this kernel?
MENUCONFIG="no"

# Run 'make nconfig' (ncurses 'menuconfig') before compiling this kernel?
NCONFIG="no"

# Note, that two previous lines are mutual exclusive (logically), while
# MENUCONFIG has a higher priority if both them is enabled.

# Run 'make clean' before compilation?
# If set to NO, implies MRPROPER WILL NOT be run
# Also, if clean is NO, it won't copy over any configuration
# file, it will use what's there.
CLEAN="no"

# Run 'make mrproper' before configuration/compilation?
MRPROPER="no"

# Override the arch detection?
#ARCH_OVERRIDE="x86"

# Mount BOOTDIR automatically if it isn't mounted?
MOUNTBOOT="no"

# Make symlinks in BOOTDIR automatically?
#SYMLINK="no"

# Save the new configuration in /etc/kernels upon
# successfull compilation
SAVE_CONFIG="yes"

# Use Color output in Genkernel?
USECOLOR="yes"

# Clear build cache dir
#CLEAR_CACHE_DIR="yes"

# Clear all tmp files and caches after genkernel has run
#POSTCLEAR="1"

# Genkernel uses an independent configuration for MAKEOPTS, and does not source
# /etc/make.conf . You can override the default setting by uncommenting and
# tweaking the following line. Default setting is set up by
# ${GK_SHARE}/${ARCH_OVERRIDE}/config.sh . The recommended value for -j
# argument is: <number of processors>*<number of cores per processor>+1
MAKEOPTS="-j3"

# Add in LVM support from static binaries if they exist on the system, or
# compile static LVM binaries if static ones do not exist.
LVM="no"

# Add in Luks support. Needs sys-fs/cryptsetup with -dynamic installed.
#LUKS="no"

# Add in GnuPG support
#GPG="no"

# Add DMRAID support.
#DMRAID="no"

# Include (or suppresses the inclusion of) busybox in the initrd or initramfs.
# If included, busybox is rebuilt if the cached copy is out of date.
#BUSYBOX="yes"

# Use udev instead of mdev as the default device manager for the initramfs.
# If you use systemd and perhaps lvm, you _must_ keep this turned on.
UDEV="yes"

# Includes mdadm/mdmon binaries in initramfs.
# Without sys-fs/mdadm[static] installed, this will build a static mdadm.
#MDADM="no"

# Specify a custom mdadm.conf.
# By default the ramdisk will be built *without* an mdadm.conf and will auto-detect
# arrays during bootup.  Usually, this should not be needed.
#MDADM_CONFIG="/etc/mdadm.conf"

# Add Multipath support.
#MULTIPATH="no"

# Add iSCSI support.
#ISCSI="no"

# Add e2fsprogs support.
#E2FSPROGS="no"

# Enable copying of firmware into initramfs
FIRMWARE="yes"
# Specify directory to pull from
FIRMWARE_DIR="/lib/firmware"
# Specify specific firmware files to include. This overrides FIRMWARE_DIR
FIRMWARE_FILES=""

# Add new kernel to grub?
BOOTLOADER="grub"

# Enable splashutils in early space (initrd). Default is "no".
SPLASH="yes"

# Use this splash theme. If commented out - the "default" name theme is used.
# Also, SPLASH="yes" needs to be enabled for this one to one work.
# This supersedes the "SPLASH_THEME" option of /etc/conf.d/splash (in early space).
SPLASH_THEME="gentoo"

# Installs, or not, plymouth into the initramfs. If "splash" will be
# passed at boot, plymouth will be activated.
PLYMOUTH="yes"

# Embeds the given plymouth theme into the initramfs.
# PLYMOUTH_THEME="text"

# =========Keymap Settings=========
#
# Force keymap selection at boot
#DOKEYMAPAUTO="yes"


# Disables keymap selection support
#KEYMAP="0"


# =========Low Level Compile Settings=========
#
# GNU Make to use for kernel.  See also the --kernel-make command line option.
#KERNEL_MAKE="make"

# Compiler to use for the kernel (e.g. distcc).  See also the --kernel-cc
# command line option.
#KERNEL_CC="gcc"

# Assembler to use for the kernel.  See also the --kernel-as command line
# option.
#KERNEL_AS="as"

# Linker to use for the kernel.  See also the --kernel-ld command line option.
#KERNEL_LD="ld"

# GNU Make to use for the utilities.  See also the --utils-make command line
# option.
#UTILS_MAKE="make"

# Compiler to use for the utilities (e.g. distcc).  See also the --utils-cc
# command line option.
#UTILS_CC="gcc"

# Assembler to use for the utilities.  See also the --utils-as command line
# option.
#UTILS_AS="as"

# Linker to use for the utilities.  See also the --utils-ld command line
# option.
#UTILS_LD="ld"

# =========GENKERNEL LOCATION CONFIGURATION============
# Variables:
#   %%ARCH%%  - Final determined architecture
#   %%CACHE%% - Final determined cache location

# Set genkernel's temporary work directory.  Default is /var/tmp/genkernel
#TMPDIR="/var/tmp/genkernel"

# Set the boot directory, default is /boot
BOOTDIR="/boot"

# Default share directory location
GK_SHARE="${GK_SHARE:-/usr/share/genkernel}"

# Location of the default cache
CACHE_DIR="/var/cache/genkernel"
# Location of DISTDIR, where our source tarballs are stored
DISTDIR="/var/lib/genkernel/src"
# Log output file
LOGFILE="/var/log/genkernel.log"
# Debug Level
LOGLEVEL=1

# =========COMPILED UTILS CONFIGURATION============
#
# Default location of kernel source
DEFAULT_KERNEL_SOURCE="/usr/src/linux"
# Default kernel config (only use to override using
# arch/%%ARCH%%/kernel-config-${VER}.${PAT} !)
#DEFAULT_KERNEL_CONFIG="${GK_SHARE}/arch/%%ARCH%%/kernel-config"

# Specifies a user created busybox config
#BUSYBOX_CONFIG="/path/to/file"
#BUSYBOX_APPLETS="[ ash sh mount uname echo cut cat"

# NOTE: Since genkernel 3.4.41 the version of
#   busybox, lvm, mdadm, .. have been moved to
#   /usr/share/genkernel/defaults/software.sh in order to
#   reduce the merging you have to do during etc-update.
#   You can still override these settings in here.


# =========MISC KERNEL CONFIGURATION============
#
# Tag the kernel and ramdisk with a name:
# If not defined the option defaults to
# 'genkernel'
#KNAME="genkernel"


# This option is only valid if kerncache is
# defined. If there is a valid kerncache no checks
# will be made against a kernel source tree
#KERNEL_SOURCES="0"


# Build a static (monolithic kernel)
#BUILD_STATIC="1"


# Make and install kernelz image (PowerPC)
#GENZIMAGE="1"


# File to output a .tar.bz2'd kernel contents
# of /lib/modules/ and the kernel config
# NOTE: This is created before the callbacks
# are run!
#KERNCACHE="/path/to/file"


# Prefix to kernel module destination, modules
# will be installed in <prefix>/lib/modules
# (.conf equivalent of --module-prefix=<dir>)
#INSTALL_MOD_PATH=""


# =========MISC INITRD CONFIGURATION============
#
# Copy all kernel modules to the ramdisk
#ALLRAMDISKMODULES="1"


# Don't copy any modules to the ramdisk
#RAMDISKMODULES="0"


# File to output a .tar.bz2'd kernel and ramdisk:
# No modules outside of the ramdisk will be
# included...
#MINKERNPACKAGE="/path/to/file.bz2"


# File to output a .tar.bz2'd modules after the
# callbacks have run
#MODULESPACKAGE="/path/to/file.bz2"


# Directory structure to include in the initramfs,
# only available on >=2.6 kernels
#INITRAMFS_OVERLAY=""


# Build the generated initramfs into the kernel instead of
# keeping it as a separate file
#INTEGRATED_INITRAMFS="1"


# Compress generated initramfs
#COMPRESS_INITRD="yes"
# Types of compression: best, xz, lzma, bzip2, gzip, lzop, fastest
# "best" selects the best available compression method
# "fastest" selects the fastest available compression method
#COMPRESS_INITRD_TYPE="best"


# Create a self-contained env in the initramfs
#NETBOOT="1"


# =========MISC BOOT CONFIGURATION============
#
# Specify a default for real_root=
#REAL_ROOT="/dev/one/two/gentoo"

echo ">=dev-qt/qtwebkit-5.6.1:5 -gstreamer010 -multimedia" >> /etc/portage/package.use