CI issues: OSX agents occasionally crashing with `1 leaked semaphore`

I’ve seen a pretty substantial increase in flakiness of osx agents recently, which fail during what usually seems to be the artefact analysis step (after the main build has run through).

The most memorable (if perhaps irrelevant things) I remembered from those failures that they often mentioned 1 leaked semaphore.

Below is another example that now showed up in arrow CI:

/usr/local/miniconda/etc/profile.d/conda.sh: line 9: 18881 Segmentation fault: 11  "$CONDA_EXE" $_CE_M $_CE_CONDA "$@"
/usr/local/miniconda/lib/python3.9/multiprocessing/resource_tracker.py:216: UserWarning: resource_tracker: There appear to be 1 leaked semaphore objects to clean up at shutdown

Is someone aware of this already and/or know what this could be caused by?

[wolfv]

There is a new version of lief that came out today (0.12.3) that might fix a couple of segfaults. I’ve tried to reproduce segfaults (unsuccesfully): https://github.com/lief-project/LIEF/issues/814

[Tobias-Fischer]

Yeah - we are manually pinning liblief in some feedstocks by adding this to the conda-forge.yml and rerendering:

remote_ci_setup:
   - liblief=0.11.5
   - conda-forge-ci-setup=3

See https://github.com/conda-forge/qt-main-feedstock/pull/43/commits/1c9f19a56d19b4e414dc89811da5e8519d064eff