luatexdir/luaoutputdir.test non-deterministic test failure

Hi,

Building the package texlive-bin in GNU Guix, which is at version
2025.2, I've hit the same test failure numerous times, although not
every time (non-deterministic):

--8<---------------cut here---------------start------------->8---
FAIL: luatexdir/luaoutputdir
============================

#!/gnu/store/30hszyg5y5py69r4a8glc43w0zrdbr7k-bash-minimal-5.2.37/bin/sh -vx
# luaoutputdir.test - check that Lua-level kpse.* reads from -output-directory.
# Public domain. Originally written by Karl Berry, 2023.
# https://github.com/latex3/latex3/issues/1070

BinDir=${BinDir:-.} # ordinarily run from the web2c builddir
+ BinDir=.
ExeExt=${ExeExt:-}
+ ExeExt=
_luatex=$BinDir/luatex$ExeExt
+ _luatex=./luatex

# in case we're invoked standalone instead of from make.
test -z "$srcdir" && srcdir=`cd \`dirname $0\`/.. && pwd` # web2c/
+ test -z ../../../source/texk/web2c
TEXMFCNF=$srcdir/../kpathsea; export TEXMFCNF
+ TEXMFCNF=../../../source/texk/web2c/../kpathsea
+ export TEXMFCNF

outdir=tests/outdirlua
+ outdir=tests/outdirlua
outfile=outfileLUA.tex
+ outfile=outfileLUA.tex
rm -rf $outdir  # don't let previous runs interfere
+ rm -rf tests/outdirlua
mkdir $outdir || exit 1
+ mkdir tests/outdirlua
mkdir: cannot create directory ‘tests/outdirlua’: No such file or directory
+ exit 1
FAIL luatexdir/luaoutputdir.test (exit status: 1)


error: in phase 'check': uncaught exception:
%exception #<&invoke-error program: "make" arguments: ("check" "-j" "32" "--max-load=32") exit-status: 2 term-signal: #f stop-signal: #f> 
phase `check' failed after 6.7 seconds
--8<---------------cut here---------------end--------------->8---

It was first reported against Guix, where you can find more context such
as a complete build log.

The inputs of texlive-bin are:

--8<---------------cut here---------------start------------->8---
[email protected] [email protected] [email protected] [email protected] [email protected] [email protected]
+ [email protected] [email protected] [email protected] [email protected] [email protected]
--8<---------------cut here---------------end--------------->8---

I'll try disabling this test in the Guix package meanwhile.

-- 
Thanks,
Maxim