[release-0.19] 🐛 Fakeclient: Fix TOCTOU races #2992
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The fake client currently has a number of time of check time of use races, where it fetches an object to determine what to do in a mutating operation. The problem is that the object might change in between fetching it and doing the mutating operation. Most notably, this happens when: * Patching is done in parallel. Only one of the patches will succeed, the other ones will fail with a conflict * Updates of objects that allow unconditional updates: All updates will succeed, but not all of them will increment the resource version (i.E dirty writes for the RV) * An update for an object that allows createOnUpdate races with a create or delete * A DeleteAllOf call races with Delete calls * A scale update races with a normal update This change: * Adds tests for all of these cases * Fixes them by adding a lock around the write operations, including their read part, if any
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alvaroaleman
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Oct 19, 2024
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: alvaroaleman, k8s-infra-cherrypick-robot The full list of commands accepted by this bot can be found here. The pull request process is described here
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This is an automated cherry-pick of #2980
/assign alvaroaleman