bug#51787: GC takes more than 9 hours on berlin

[Mathieu Othacehe]

Hey,

> Still, I’m surprised a mere ‘rm -rf’ can take this long.  ‘strace -T’ on
> the child guix-daemon process doesn’t reveal anything obviously wrong,
> pause times or similar.

I noticed that the process isn't around anymore. Did anyone killed it,
or maybe it just crashed? Also noticed some trash removing commands were
running. Regardless of the root cause of the problem, getting rid of the
trash directory before the next evaluation seems like a good idea.

Thanks,

Mathieu