hurd console locks after ls -la /dev/cons

[computer.enthusiastic]

In my Debian/Hurd installation, after hurd console is started, I would like to explore the /dev/cons directory with the command:

    ls -la /dev/cons

 
this command gives the output:

    hurd:~# ls -la /dev/cons
    total 4
    drwxrwxr-x 1 root root    0 26 set 16:28 .
    drwxr-xr-x 3 root root 4096 26 set 16:12 ..
    prwxrwxr-x 1 root root    0 26 set 16:28 kbd
    [I would have expected more output here, for example about /dev/cons/mouse]

but after it, the hurd console is completely frozen and it seems that
there is no way to gain control over it. The hurd console does not
respond to left-alt-backspace key sequence and therefore I have no
possibility to come back to mach console, too.

Does anyone experienced the same event ?

Is there a different safer way to explore the /dev/cons directory tree (maybe I'm doing something I'm supposed not to do) ?

Thanks for any advice.