Re: AB-INT issues - where we could use help

["Mathieu Dubois-Briand" <mathieu.dubois-briand@bootlin.com>]

On Mon Jul 27, 2026 at 11:12 PM CEST, Richard Purdie wrote:
> Hi,
>
> There are at least a couple of intermittent issues where we would
> welcome some help and we now probably have enough information to allow
> debugging/progress.
>
> Firstly, we suspect there is a reproducibility issue arm to x86. This
> is summarised with this reproducibility diff:
>
> https://valkyrie.yocto.io/pub/repro-fail/oe-reproducible-20260726-9wb1l3t4/packages/diff-html/
>
> (from
> https://valkyrie.yocto.io/pub/repro-fail/oe-reproducible-20260726-9wb1l3t4/packages/diff-html/)
>
> I suspect what happened here is that the qemux86-64 files were built
> first on an arm host rather than an x86 host. In general the x86 hosts
> probably beat the arm hosts to it, hence why this is rare.
>
> To test/reproduce this, I'd suggest picking a target machine (say
> qemux86-64) and then building diffutils on both an x86-64 based host
> and on an aarch64 host. Comparing the ptest package will probably
> result in a diff similar to the above, e.g.:
>
> build_triplet·=·aarch64-unknown-linux-gnu
>
> vs.
>
> build_triplet·=·x86_64-pc-linux-gnu
>
> in usr/lib/diffutils/ptest/tests/Makefile amongst other things. I
> suspect picking MACHINE=qemuarm64 would have the same result.
>
> If that reproduces the issue, it would then be a case of iterating
> through the differnces and finding a way to reconcile the output so it
> is the same, independent of build host architecture.
>

Just a follow-up, as I did open a bug entry for this issue:
https://bugzilla.yoctoproject.org/show_bug.cgi?id=16376

Thanks,
Mathieu

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com