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

["pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de>]

I got a locked /etc/shadow again now despite Ludovic’s patches (which
would nonetheless give me a better feeling when pushed).

When booting an unbootable generation with Ludovic’s patches and then
rebooting a normal generation with Ludovic’s patches, /etc/shadow is
locked.

Note that I get a message like “/dev/mapper/Guix: recovering journal”
when booting (I did not pay attention to that before).  I shut down
the unbootable generation with Ctrl+Alt+Del.  When I normally shut
down with Ctrl+Alt+Del I get no such message.

The unbootable generation was deliberately made unbootable like this:

On Tue, Jun 04, 2019 at 04:12:17PM +0200, pelzflorian (Florian Pelz) wrote:
> > I have multiple broken generation.  On one that now for a third time
> > (on old generations without Ludo’s patches) led to a locked
> > /etc/shadow after booting I changed the line
> > (let ((pid (fork+exec-command (list udevd))))
> > in gnu/services/base.scm to, I believe, this:
> > (let ((pid (fork+exec-command (list udevd "--debug-trace"))))
> > 
> > (I am unsure if this is the same broken generation as on my first
> > report of the issue.  I may have gotten confused.)
> > 
> > This is unbootable, correct would have been --debug and not
> > --debug-trace.
> >
> 
> The line in
> /gnu/store/kdql26k1pxgm74d94ryzk8fb4lg5q0ra-shepherd-udev.scm
> referenced from
> /gnu/store/b7mrb5pzsbbvhjmi8lbm9xa4wgvqbc7g-shepherd.conf referenced
> from the broken /var/guix/profiles/system-35-link/boot
> is
> 
> (let ((pid (fork+exec-command (list udevd "--debug-trace" "--verbose"))))
> 

Regards,
Florian