RootTests: libCPyCppyy.so: undefined symbol: Py_HashPointer

[andresailer]

Check duplicate issues.

• Checked for duplicates

Description

There are multiple tests failing with this error message in the ROOT master branch

-- TEST COMMAND -- 
cd /build/jenkins/workspace/lcg_nightly_pipeline/build/projects/ROOT-HEAD/src/ROOT-HEAD-build/roottest/main
/usr/bin/timeout -s USR2 270s /build/jenkins/workspace/lcg_nightly_pipeline/build/projects/ROOT-HEAD/src/ROOT-HEAD-build/bin/rootrm -r copy_replace_recursive.root
-- BEGIN TEST OUTPUT --

-- END TEST OUTPUT --
-- BEGIN TEST ERROR --
Traceback (most recent call last):
  File "/build/jenkins/workspace/lcg_nightly_pipeline/build/projects/ROOT-HEAD/src/ROOT-HEAD-build/bin/rootrm", line 10, in <module>
    import cmdLineUtils
  File "/build/jenkins/workspace/lcg_nightly_pipeline/build/projects/ROOT-HEAD/src/ROOT-HEAD-build/lib/cmdLineUtils.py", line 79, in <module>
    import ROOT
  File "/build/jenkins/workspace/lcg_nightly_pipeline/build/projects/ROOT-HEAD/src/ROOT-HEAD-build/lib/ROOT/__init__.py", line 20, in <module>
    import cppyy
  File "/build/jenkins/workspace/lcg_nightly_pipeline/build/projects/ROOT-HEAD/src/ROOT-HEAD-build/lib/cppyy/__init__.py", line 74, in <module>
    from ._cpython_cppyy import *
  File "/build/jenkins/workspace/lcg_nightly_pipeline/build/projects/ROOT-HEAD/src/ROOT-HEAD-build/lib/cppyy/_cpython_cppyy.py", line 26, in <module>
    import cppyy.libcppyy as _backend
ImportError: /build/jenkins/workspace/lcg_nightly_pipeline/build/projects/ROOT-HEAD/src/ROOT-HEAD-build/lib/libCPyCppyy.so: undefined symbol: Py_HashPointer

-- END TEST ERROR --
CMake Error at /build/jenkins/workspace/lcg_nightly_pipeline/build/projects/ROOT-HEAD/src/ROOT/HEAD/cmake/modules/RootTestDriver.cmake:186 (message):
  got exit code 1 but expected 0

roottest-main-NameCyclesRootmv
roottest-main-RootcpReadRemoteClean
roottest-main-RootcpReplaceRecursiveClean
roottest-main-SimpleRootcp1Clean
roottest-main-SimpleRootcp2Clean
roottest-main-SimpleRootcp3Clean
roottest-main-SimpleRootcp4Clean
roottest-main-SimpleRootcp5Clean
roottest-main-SimpleRootmkdir1
roottest-main-SimpleRootmkdir2
roottest-main-SimpleRootmkdir3
roottest-main-SimpleRootmv1
roottest-main-SimpleRootmv2
roottest-main-SimpleRootmv3
roottest-main-SimpleRootmv4
roottest-main-SimpleRootmv5
roottest-main-SimpleRootrm1
roottest-main-SimpleRootrm2
roottest-main-SimpleRootrm3
roottest-root-multicore-ttree_read_imt

See: https://lcgapp-services.cern.ch/cdash/viewTest.php?onlyfailed&buildid=142202

On January 24 (midnight) these were not yet failing.
We are building against python 3.13.11

Reproducer

build from source against, run ctest

ROOT version

ROOT master

Installation method

from source

Operating system

Alma Linux 9

Additional context

Python 3.13.11

[guitargeek]

Hi! It must be related to a Python version mismatch caused by not setting the PATH variable in roottest anymore:

302824e#diff-84d4bee34fb29410ca0629157cdf0b2d6fdaa43ad0f477a96ed4b1ea14016c11R3236

Before that commit, there was this PATH=${_path}:$ENV{PATH} part of the test environment which hardcoded the path at configuration time into the path at test time. Could dropping that make a difference in your setup? Maybe at test time, your PATH doesn't contain the the Python version that ROOT was built against anymore?

In any case, In think the correct fix here is not to mess around with the PATH, but to just use the right Python executable explicitly for the tests, as it was coincidentally already done on Windows. PR opened:

• [roottest] Ensure correct Python executable in command line tools tests #21025

[guitargeek]

Fixed in "not applicable" because it was a temporary regression.

[andresailer]

Thanks! We will se tomorrow.

[andresailer]

These tests are back to passing. Thanks again!