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setup-micromamba failing with code 3221225781 (STATUS_ACCESS_VIOLATION) #306
Description
This is a new one today:
From a recent workflow run: https://github.com/Ouranosinc/xscen/actions/runs/25866938467/job/76012677697
At first, I figured it might be due to the changes to windows-latest (2025 → 2026), but even after forcing 2025, I am getting the exact same errors. No issues before this morning.
This started occurring with setup-micromamba v2.0.7, but upgrading to v3.0.0 has not had any positive impact (beyond muting node.js warnings).
Activity
ci: replace micromamba with setup-python on Windows
ci: Pin micromamba on Windows
ci: pin to earlier micromamba version
larsoner commentedon May 18, 2026
Looks like this is probably due to mamba-org/micromamba-releases#97 . Using the
micromamba-versionworkaround from python-visualization/folium#2224 :Allowed things to work for me in the meantime
Fix Windows CI: use setup-python instead of broken setup-micromamba
Fix CI flakiness and improve resilience (#3097)
HealthyPear commentedon May 20, 2026
They just released a new fix, see
https://github.com/mamba-org/mamba/releases/tag/2.6.2
pavelzw commentedon May 20, 2026
cc @jjerphan in case you didn't see this issue
ci: use micromamba 2.6.2-1
jjerphan commentedon Jun 2, 2026
This was due to mamba-org/mamba#4276 which was fixed by 2.6.2.
Please let us know if you still have an issue.
ci: use micromamba 2.6.2-1