Bug#1020544: siconos: FTBFS on s390x: Cholesky solve kNM_test failed

[Stephen Sinclair]

On Fri, Sep 23, 2022 at 5:33 AM Aron Xu <aron at debian.org> wrote:

> Package: siconos
> Version: 4.4.0+dfsg-1
> Severity: important
>
> The new version FTBFS on s390x in test suite 23, relevant log entry:
>
> > Cholesky solve preserving matrix
> > Cholesky solve kNM_test: ./numerics/src/tools/NumericsMatrix.c:3023:
> NM_csc: > Assertion `A->matrix2->csc->m == A->size0 && "inconsistent size
>
> Full build log is
>
> https://buildd.debian.org/status/fetch.php?pkg=siconos&arch=s390x&ver=4.4.0%2Bdfsg-1&stamp=1663797112&raw=0
>
> Regards,
> Aron
>
>
Thanks for this bug report.  I was able to reproduce the problem under
qemu, and it is unclear to me whether the problem is actually a missing
step in dense-to-sparse conversion, or simply a problematic assert after.
It seems to be an issue showing up only on this architecture, because the
numerical results of the test are slightly different, but this is possibly
revealing a logical error in how dense to sparse is working or how the
results are checked.  Therefore, I have reported it upstream [0] and will
try to include a patch in a package update if/when we are able to determine
what is going on here.

[0] https://github.com/siconos/siconos/issues/467

regards,
Steve
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