In 2.31.0 (upstream PR #959) I added a test configuration option
HYPRE_CHECKPAR_TOL to allow controlling the checkpar test tolerance,
which was failing on many of the architectures that debian builds for
(arm64 i386 ppc64el riscv64 s390x hppa loong64 powerpc ppc64), see
Issue #955.

Setting HYPRE_CHECKPAR_TOL facilitated builds of hypre 2.*. But with
hyper 3.0.0 the discrepancy has widened, and the required tolerance
for some tests would need to be greater than 1e-1 (in hypre 2 these
arches passed by relaxing the tolerance from 1e-6 to 1e-3).

A tolerance greater than 1e-1 seems a little excessive, so I raise the
issue upstream $1457

Debian build logs showing the test error logs can be found at
https://buildd.debian.org/status/package.php?p=hypre (past logs can be
accessed via the "old" links). For instance the failing build for for
arm64 is
https://buildd.debian.org/status/fetch.php?pkg=hypre&arch=arm64&ver=3.0.0-2&stamp=1768915710&raw=0

An excerpt from the log is

Testing IJ ...

FAILED : TEST_ij/solvers.err  (63510)

(651) - Final L2 norm of residual: 2.011802e-02
(651) + Final L2 norm of residual: 1.874054e-02      (err 1.38e-03)

(655) - Final L2 norm of error: 9.197532e+00
(655) + Final L2 norm of error: 8.649254e+00      (err 5.48e-01)

(656) - Final L2 norm of e0: 1.798116e+00
(656) + Final L2 norm of e0: 1.696116e+00      (err 1.02e-01)

(657) - Final L2 norm of e1: 5.728875e+00
(657) + Final L2 norm of e1: 5.417061e+00      (err 3.12e-01)

(658) - Final L2 norm of e2: 6.967164e+00
(658) + Final L2 norm of e2: 6.525966e+00      (err 4.41e-01)
...

make check is passing, it's only make checkpar that fails this way. The tests pass on amd64 (x86_64)

We believe that the bug you reported is fixed in the latest version of
hypre, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1126042@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Drew Parsons <dparsons@debian.org> (supplier of updated hypre package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Tue, 20 Jan 2026 22:49:41 +0100
Source: hypre
Architecture: source
Version: 3.0.0-3
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Drew Parsons <dparsons@debian.org>
Closes: 1126042
Changes:
 hypre (3.0.0-3) unstable; urgency=medium
 .
   * debian patch test_checkpar_rtol.patch runs checkpar tests
     setting rtol instead of atol, for more uniform tolerance control.
     debian/rules sets HYPRE_CHECKPAR_TOL=0.05 (as rtol) for arches
     failing the default 1e-6.  Closes: #1126042.
Checksums-Sha1:
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 64646fa192582a1497ae98755340dfdc63bf574f 18536 hypre_3.0.0-3.debian.tar.xz
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 1283ccd80c37e3996268c789d529c7f55397b02a7af5ac6bf46c5ec323a809f4 18536 hypre_3.0.0-3.debian.tar.xz
Files:
 b97c035ee6652c99f39b35fe1bc1832d 3466 math optional hypre_3.0.0-3.dsc
 165accf82aee18f37e975799055903c4 18536 math optional hypre_3.0.0-3.debian.tar.xz
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Reopening this bug, since test case (897) gets abs err 34.2 and rel
err 0.441, so no reasonable value of HYPRE_CHECKPAR_TOL will help,
whether as atol or rtol.

Set severity important rather than serious, since 3.0.0-4 simply skips
checkpar on the failing architectures.