Thanks. I rewrite config, following your advice and run 'guix system --verbosity=10 reconfigure new.scm':
acquiring global GC lock `/var/guix/gc.lock'
acquiring read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
acquiring write lock on `/var/guix/temproots/434'
downgrading to read lock on `/var/guix/temproots/434'
...
and the same thing many more times.
This is a bug?