Bug#1043048: openblas: gives wrong results on mips64el, ignores test failures
Package: libopenblas0-pthread
Version: 0.3.23+ds-2
Control: affects -1 src:statsmodels
Severity: serious
Justification: the default BLAS should NOT silently give wrong answers
(i.e. if there's no easy way to actually fix this, please switch the
default on mips64el back to atlas, and consider removing this package
from mips64el)
statsmodels recently (between 0.14.0+dfsg-1 and -2) started to FTBFS on
mips64el with multiple wrong test results. The most obviously relevant
change between those is that the installed BLAS changed from atlas to
openblas.
openblas' own tests on mips64el (
https://buildd.debian.org/status/fetch.php?pkg=openblas&arch=mips64el&ver=0.3.23%2Bds-2&stamp=1686760279&raw=0
) have 64 instances of "FATAL ERROR - COMPUTED RESULT IS LESS THAN HALF
ACCURATE". (I don't know why this isn't failing the build, which is
possibly a bug in itself.)
openblas upstream are not _obviously_ aware of this. Given the
existence of .github/workflows/mips64.yml, this suggests it _may_ be
nontrivial to reproduce in qemu.
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