Bump conda-libmamba-solver to 26.4.2#878
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26.4.0 has a database locking bug in shards_cache.py that causes sqlite3.OperationalError during concurrent solves. Fixed in 26.4.1 and 26.4.2. This is breaking conda CI since the base miniforge environment ships 26.4.0, and the locking error hits before test dependencies can be installed.
This was referenced May 14, 2026
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…16097) Miniforge currently ships c-l-s 26.4.0 which has a sqlite database locking bug in shards_cache.py. The base conda that resolves test dependencies crashes before the environment can be set up. Upgrade c-l-s to >=26.4.1 in base after setup-miniconda and before the main conda install step. Temporary workaround until miniforge ships c-l-s >=26.4.1 (conda-forge/miniforge#878).
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jaimergp
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Co-authored-by: jaimergp <jaimergp@users.noreply.github.com>
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conda-libmamba-solver 26.4.0 (currently shipped in miniforge 26.3.2-1) has a database locking bug in
shards_cache.pythat causessqlite3.OperationalError: database is lockedduring concurrent solves.This is breaking downstream CI (e.g. conda's own test suite) because the base miniforge environment ships 26.4.0, and the locking error hits during dependency installation before the test environment can even be set up.
The fix landed in 26.4.1 (https://github.com/conda/conda-libmamba-solver/releases/tag/26.4.1) with further improvements in 26.4.2 (https://github.com/conda/conda-libmamba-solver/releases/tag/26.4.2).
Example failure: https://github.com/conda/conda/actions/runs/25867286560/job/76012696400?pr=16096