Skip KrylovPreconditioners in downgrade promotion#1091
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ChrisRackauckas merged 1 commit intoJul 15, 2026
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Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
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July 15, 2026 20:47
This was referenced Jul 17, 2026
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Please ignore this PR until it has been reviewed by @ChrisRackauckas.
Summary
Keep
KrylovPreconditionersout of the joint minimum-version promotion in the downgrade workflow, alongside the existing fleet-wideMooncakeexception.Root cause and impact
Resolver.jl cannot minimum-resolve KrylovPreconditioners' historical Arpack/LightGraphs dependency graph. This is a resolver limitation in an old transitive graph, not a LinearSolve runtime incompatibility. The package remains installed at a compatible version for tests; all other promoted dependencies continue to be floor-tested.
Local validation
no_promote=Mooncake,KrylovPreconditioners.LINEARSOLVE_TEST_GROUP=Coresuite and observed exit code 0 withLinearSolve tests passed.julia -m Runic --check --diff --verbose .: all 142 Julia files passed.actionlint .github/workflows/Downgrade.ymlandgit diff --check: both passed.Process
Reproduced the resolver failure at the current default-branch SHA, isolated it from the runtime tests, applied the narrow workflow input exception, and reran the full root Core downgrade suite.