fix(consensus): prevote nil upon timeout when Proposal is missing (backport #2218)#2309
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fix(consensus): prevote nil upon timeout when Proposal is missing (backport #2218)#2309
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melekes
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Feb 12, 2024
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) This bug was possibly introduced by #1203. This PR refactored the consensus operation, propose -> prevote transition (`defaultDoPrevote` method), to match the pseudo-code. The refactoring assumed that when `cs.ProposalBlock` is unset (nil), so should be `cs.Proposal` (meaning that the node didn't receive the round proposal). In this case, the node must prevote nil. The added test unit describes a scenario where `cs.Proposal` is nil (not received), but the block ` cs.ProposalBlock` is received because the node sees a Polka for a block, then receives the full associated block. The node must prevote nil in this scenario, in line with #1203. But the lack of the test on `cs.Proposal` leads to a bug. This bug does not affect previous releases except for `v1.0`. --- #### PR checklist - [ ] Tests written/updated - [ ] Changelog entry added in `.changelog` (we use [unclog](https://github.com/informalsystems/unclog) to manage our changelog) - [ ] Updated relevant documentation (`docs/` or `spec/`) and code comments - [ ] Title follows the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) spec (cherry picked from commit 2f2e882)
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cason
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This is an automatic backport of pull request #2218 done by Mergify.
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