bug#22274: epochfail

[Christopher Allan Webber]

> pasting from #guix
>
> <francis7> mark_weaver, can you (and also inform others of this) check
> what it says on https://libreboot.org/faq/#epochfail
> <francis7> Quote: "This seems to be an issue in Linux kernel version
> 4.3 and higher, though it may also affect older releases. We know that
> it does not affect Linux kernel version 3.13 (the one used in Trisquel
> 7, which many libreboot developers and users use). A bisect of the
> upstream linux kernel Git repository is in order, so that we can find
> out which commit introduced this issue."

See also http://debbugs.gnu.org/cgi/bugreport.cgi?bug=22274#38 which
confirms that this happens sometime between Linux-Libre 4.2.5 and 4.3.3
so that narrows things down a bit.