I tried reconfiguring from chroot but ran into some issues. I bind-mounted /dev, /sys, /proc, and /var from the installer to the target, which got past some errors. The one I couldn't get past was being unable to find the glibc derivation in the store, though the file was present. Not sure what went wrong there.

On Sat, Jan 19, 2019 at 6:19 PM Danny Milosavljevic <dannym@scratchpost.org> wrote:
Hi Bryan,

On Sat, 19 Jan 2019 07:15:43 -0800
Bryan Ferris <saffsnail@gmail.com> wrote:

> Well, the partition is > 400GiB which makes it difficult to `dd`. I'm not
> sure if I have a drive big enough to store it, even if I pipe it directly
> into a compression algorithm. Would compressing the files themselves be
> sufficient? I'm going to hold off on reconfiguring until I hear back from
> you on this because if that fixes it then it might also destroy evidence of
> the bug.

Yes, I would suggest you do (in a chroot, probably):

* compress all the files from the root partition (i.e. something like tar zcvf)
* dd only the uefi partition

... and then send those two files to us.