[Reproducible-builds] How to react on "the second build failed, even though the first build was successful" ?

[Esa Peuha]

On Sat, Dec 12, 2015 at 6:14 PM, Chris Lamb <lamby at debian.org> wrote:
> I've lost my scrollback apologies but IIRC it wasn't anything beyond acknowledgement of the issue which I felt was enough to share with Thomas to prevent him thinking it was "his" issue to debug.

OK, no problem. I was just wondering if anyone had any idea what
might be causing the issue or how to debug it. From what I've seen
on my pbuilder setup, the issue seems reproducible; as long as
the package to build and its build dependencies don't change,
the build will always fail the same way. That makes me think that
it probably shouldn't be too difficult to debug, at least for
someone who knows how to debug pbuilder, but I'm afraid I don't.