Re: Autobuilder reproducibility target changes

Alexander Kanavin <alex.kanavin@...>

I’ve definitely seen diffoscope process take hours and hours and hours in local builds. Trying it with these vim packages locally should still be done.


On Sun 14. Feb 2021 at 20.18, Joshua Watt <jpewhacker@...> wrote:
On Sun, Feb 14, 2021 at 6:19 AM Richard Purdie
<richard.purdie@...> wrote:
> Regular users of the autobuilder will note that I've split the
> reproducible builds test out of the main oe-selftest build and into its
> own target build. This is because that test tends to run for a lot
> longer time period and it helps to see the result separately.
> I've only done this for master. If gatesgarth and dunfell want to
> follow, that should be straight forward with a change to the branch in
> autobuilder-helper. Obviously we should ensure this is working ok with
> master first but so far so good.
> It has already highlighted the difference between a successful run:
> (took 3-4 hours)
> and failing two failing runs:
> (took 9 hours)

OK, I read through the code and unfortunately found a bug: when
attempting to make sure the "B" build doesn't use sstate, I misspelled
the SSTATE_MIRRORS, which means that the B build could have been
pulling from the sstate mirror when it was not supposed to. This has a
few implications:

 1) It might explain why some of the reproducible results seem intermittent
 2) It might explain why there is such a time disparity between the tests

Unfortunately, while it probably will help the intermittent results,
it probably means that the tests taking 9 hours is what is "supposed"
to happen, and they happen to be shorter sometimes because the B build
is pulling from sstate when it's not supposed to.

> the time difference being the system trying to run diffoscope on vim-
> common :/.
> I'm aware I removed some recipes from the exclusions list after seeing
> multiple passing builds for all distros and we're now seeing test
> failures. My mistake was not waiting for the date to change and for
> builds to run on an autobuilder worker with a different umask.
> Meson is failing with a pyc file mismatch which diffoscope can't decode
> and despite trying for 5 hours, diffoscope hasn't given any data on why
> vim-common differs. I should have fixes in for quilt, valgrind, kernel-
> devsrc and cwautomacros. The umask fix may fix other issues too. Alex
> has improved the reporting so we can spot cases where exclusion is now
> longer needed.
> Cheers,
> Richard

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