kernel panic out of memory

    if [ "${USE_LVM_NORMAL}" = "1" ]; then
      for lvm_path in /sbin/lvm /bin/lvm MISSING ; do
        [ -x "$lvm_path" ] && break
      done
      if [ "${lvm_path}" = "MISSING" ]
      then
        bad_msg "dolvm invoked, but LVM binary not available! skipping LVM volume group activation!"
      else
        # This is needed for /sbin/lvm to accept the following logic
        local cmds="#! ${lvm_path}"

        # If there is a cahe, update it. Unbreak at least dmcrypt
        [ -d /etc/lvm/cache ] && cmds="${cmds} \nvgscan"

        # To activate volumegroups on all devices in the cache
        cmds="${cmds} \nvgchange -ay --sysinit"
        if is_mdev; then
            # To create symlinks so users can use
            # real_root=/dev/vg/root
            # This needs to run after vgchange, using
            # vgchange --mknodes is too early.
            cmds="${cmds} \nvgmknodes --ignorelockingfailure"
        fi

        # And finally execute it all (/proc/... needed if lvm
        # is compiled without readline)
        good_msg "Activating Logical Volume Groups"
        printf "%b\n" "${cmds}" | $lvm_path /proc/self/fd/0
      fi
    fi

$ ls /boot
config-4.15.1-gentoo EFI grub System.map-4.15.1-gentoo vmlinuz-4.15.1-gentoo
$ lsblk
NAME             MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda                8:0    0 111.8G  0 disk 
├─sda1             8:1    0   512M  0 part /boot
└─sda2             8:2    0 111.3G  0 part /
sdb                8:16   0 465.8G  0 disk 
└─sdb1             8:17   0 465.8G  0 part 
  └─LVMHome-home 253:0    0 931.5G  0 lvm  /home
sdc                8:32   0 465.8G  0 disk 
└─sdc1             8:33   0 465.8G  0 part 
  └─LVMHome-home 253:0    0 931.5G  0 lvm  /home

menuentry 'Ubuntu, с Linux 4.9.76-gentoo-r1' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.9.76-gentoo-r1-advanced-9a12b261-98f2-4fca-af29-ff7037a2bba8' {
                recordfail
                load_video
                gfxmode $linux_gfx_mode
                insmod gzio
                if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
                insmod part_msdos
                insmod ext2
                set root='hd0,msdos1'
                if [ x$feature_platform_search_hint = xy ]; then
                  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  9a12b261-98f2-4fca-af29-ff7037a2bba8
                else
                  search --no-floppy --fs-uuid --set=root 9a12b261-98f2-4fca-af29-ff7037a2bba8
                fi
                echo    'Загружается Linux 4.9.76-gentoo-r1 …'
                linux   /boot/vmlinuz-4.9.76-gentoo-r1 root=UUID=9a12b261-98f2-4fca-af29-ff7037a2bba8 ro acpi_enforce_resources=lax dolvm
                echo    'Загружается начальный виртуальный диск …'
                initrd  /boot/initramfs-genkernel-x86-4.9.76-gentoo-r1
        }

-> % blkid
/dev/sda3: UUID="4c23a465-ad6d-427d-afea-e789da0a80fa" TYPE="swap" PARTUUID="985f3988-03"
/dev/sda1: UUID="9a12b261-98f2-4fca-af29-ff7037a2bba8" TYPE="ext4" PARTUUID="985f3988-01"
/dev/sda5: UUID="txLXCN-XKUR-tdSC-n343-Xzid-91jH-rmIL2i" TYPE="LVM2_member" PARTUUID="985f3988-05"
/dev/sdb1: UUID="Z45tx4-NkhF-2BnO-YCkc-4Q7q-Kp8Y-ADHDJj" TYPE="LVM2_member" PARTUUID="00004ce8-01"
/dev/sdc1: UUID="14AC547CAC545A76" TYPE="ntfs" PARTUUID="9af43abd-01"
/dev/mapper/sm-gentoo: UUID="10fb06a8-2c9e-4af2-9f42-895888198a6b" UUID_SUB="62786570-c579-47ab-b02c-163431d85234" TYPE="btrfs"
/dev/mapper/sm-smV0: UUID="56857124-a45f-42f9-a29d-f50a230a6e7f" TYPE="ext4"

-> % du -h /boot/initramfs-genkernel-x86-4.9.76-gentoo-r1
2,3M    /boot/initramfs-genkernel-x86-4.9.76-gentoo-r1
-> % du -h /boot/vmlinuz-4.9.76-gentoo-r1
5,4M    /boot/vmlinuz-4.9.76-gentoo-r1

-> % du -h /boot/initrd.img-4.4.0-112-generic
34M     /boot/initrd.img-4.4.0-112-generic

root=UUID=9a12b261-98f2-4fca-af29-ff7037a2bba8

/dev/mapper/sm-gentoo: UUID="10fb06a8-2c9e-4af2-9f42-895888198a6b" UUID_SUB="62786570-c579-47ab-b02c-163431d85234" TYPE="btrfs"