При выполнении grub-mkconfig -o /boot/grub/grub.cfg не реагирует.

Не поверишь я сам начал в мистику верить)))
все это проделал и ничего не помогло(

Включил дамп /boot
сделал device-mapper глобальной
df

(chroot) sysresccd / # df
Filesystem                 1K-blocks    Used Available Use% Mounted on
/dev/mapper/gentoo-root     21821264 4934700  15755044  24% /
/dev/sda1                     499656   31684    431276   7% /boot
/dev/mapper/gentoo-var_log   4062912   24712   3812104   1% /var/log
/dev/mapper/gentoo-tmp        999320    2588    927920   1% /tmp
dev                          1513904       0   1513904   0% /dev
tmpfs                        1536496       0   1536496   0% /dev/shm
tmpfs                        1536496       0   1536496   0% /sys/fs/cgroup

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df -i

(chroot) sysresccd / # df -i
Filesystem                  Inodes  IUsed   IFree IUse% Mounted on
/dev/mapper/gentoo-root    1395360 334204 1061156   24% /
/dev/sda1                    32768    366   32402    2% /boot
/dev/mapper/gentoo-var_log  262144     34  262110    1% /var/log
/dev/mapper/gentoo-tmp       65536     18   65518    1% /tmp
dev                         378476    416  378060    1% /dev
tmpfs                       384124      1  384123    1% /dev/shm
tmpfs                       384124     16  384108    1% /sys/fs/cgroup

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ls -la /boot/

(chroot) sysresccd / # ls -la /boot/
total 19072
drwxr-xr-x  4 root root     4096 Apr  7 08:57 .
drwxr-xr-x 22 root root     4096 Apr 10 18:38 ..
drwxr-xr-x  6 root root     4096 Apr 11 20:18 grub
-rw-r--r--  1 root root 10889464 Apr 11 20:08 initramfs-genkernel-x86_64-4.19.27-gentoo-r1
-rw-r--r--  1 root root        0 Apr  3 13:20 .keep
-rw-r--r--  1 root root  5612080 Apr  7 08:14 kernel-genkernel-x86_64-4.19.27-gentoo-r1
drwx------  2 root root    16384 Apr  6 12:39 lost+found
-rw-r--r--  1 root root  2991349 Apr  7 08:14 System.map-genkernel-x86_64-4.19.27-gentoo-r1

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mount

(chroot) sysresccd / # mount
/dev/mapper/gentoo-root on / type ext4 (rw,relatime)
/dev/sda1 on /boot type ext4 (rw,relatime)
/dev/mapper/gentoo-var_log on /var/log type ext4 (rw,relatime)
/dev/mapper/gentoo-tmp on /tmp type ext4 (rw,relatime)
none on /proc type proc (rw,relatime)
dev on /dev type devtmpfs (rw,nosuid,relatime,size=1513904k,nr_inodes=378476,mode=755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
mqueue on /dev/mqueue type mqueue (rw,relatime)
sys on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup2 on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/rdma type cgroup (rw,nosuid,nodev,noexec,relatime,rdma)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime,mode=700)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
configfs on /sys/kernel/config type configfs (rw,relatime)

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После обновления мира обоновися wget:)

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/etc/lvm/lvm.conf не менялся, проверял