bug#35996: User account password got locked when booting old generation

[pelzflorian (Florian Pelz)]

Please add more logging and/or locking.  Note that the elogind has the
following comment in its locking implementation in
/gnu/store/dm2ri0qvjirl0iq2ndfk5z9lq9dyk4jf-elogind-241.3-checkout/src/basic/user-util.c:

        /* This is roughly the same as lckpwdf(), but not as awful. We
         * don't want to use alarm() and signals, hence we implement
         * our own trivial version of this.
         *
         * Note that shadow-utils also takes per-database locks in
         * addition to lckpwdf(). However, we don't given that they
         * are redundant as they invoke lckpwdf() first and keep
         * it during everything they do. The per-database locks are
         * awfully racy, and thus we just won't do them. */

Regards,
Florian