Public bug reported:
The specific problem I have is with libopenblas-serial-dev, version
0.3.26, which was not compiled in a thread-safe way by the Ubuntu team
(I'm using Ubuntu 24.04). I have tested this with a c++ code with openmp
for loops and see the following behavior:
1. With libopenblas-serial-dev, whenever I set OMP_NUM_THREADS>1, the
code crashes;
2. If I replace by libopenblas-pthread-dev, the code works when
OMP_NUM_THREADS>1;
4. If I build openblas from source by hand, with USE_LOCKING=1, the code
also works;
5. If I replace by Intel MKL, the code also works;
6. If I run the same code on MacOS with Accelerate, the code also works;
7. When I check the description of the libopenblas-serial-dev package on
Ubuntu 24.04, it mentiones about USE_THREAD=0 USE_OPENMP=0
INTERFACE64=0, but does not talk about USE_LOCKING at all.
All these tests point to the possibility that USE_LOCKING was not used
in the compilation of libopenblas-serial-dev on Ubuntu 24.04, which
causes problem in my openmp program.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: libopenblas-serial-dev (not installed)
ProcVersionSignature: Ubuntu 6.11.0-17.17~24.04.2-generic 6.11.11
Uname: Linux 6.11.0-17-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.28.1-0ubuntu3.3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Feb 27 14:01:07 2025
InstallationDate: Installed on 2024-05-03 (300 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
SourcePackage: openblas
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: openblas (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2100355
Title:
openblas-serial not built in a thread-safe way
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