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Thomas Miedema authored
See Note [writeAtomic leaky abstraction]. GHC on Linux already received a patch for this bug in e0801a0f. On Windows several cabal tests were hitting the bug, causing validate failures, but we never noticed because of all the other tests that were failing on Windows. And it didn't start happening till `getModificationTime` received sub-second resolution support on Windows in 5cf76186. Since there are regression tests already, I am not adding another one. But for good measure, here is a script that shows the bug without needing to do a full validate run: DB=/tmp/package.conf.d.test GHC_PKG=ghc-pkg #utils/ghc-pkg/dist/build/tmp/ghc-pkg LOCAL_GHC_PKG="${GHC_PKG} --no-user-package-db --global-package-db=${DB}" while true; do rm -rf ${DB} ${LOCAL_GHC_PKG} init "${DB}" ${LOCAL_GHC_PKG} list done If you see "WARNING: cache is out of date" after a few seconds, the bug is not fixed. Reviewed By: austin Differential Revision: https://phabricator.haskell.org/D990 GHC Trac Issues: #10205
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