fix: clamp attestation target walk to finalized boundary#818
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latifkasuli wants to merge 1 commit into
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fix: clamp attestation target walk to finalized boundary#818latifkasuli wants to merge 1 commit into
latifkasuli wants to merge 1 commit into
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Summary
Fixes an Lstar attestation-target boundary bug where
get_attestation_target()could walk below the latest finalized checkpoint whensafe_targetwas stale behind finalization.The target-selection walk now uses
max(safe_target.slot, latest_finalized.slot)as its lower bound, and the justifiability walk stops at the finalized boundary before callingis_justifiable_after().Root Cause
safe_targetcan legally lag behindlatest_finalized. In that state, the previous implementation walked backward from head toward the stale safe target, crossed below the finalized slot, and then called:on a candidate slot before finalization. That violates the slot helper invariant and raises:
Validation
Candidate slot must not be before finalized slotuv run --group test pytest tests/lean_spec/spec/forks/lstar/forkchoice/test_attestation_target.py -q --no-covuv run --group test pytest tests/lean_spec/spec/forks/lstar/forkchoice/test_block_production_justification_gap.py tests/lean_spec/spec/forks/lstar/state -q --no-covuv run --group lint ruff check src/lean_spec/spec/forks/lstar/spec.py tests/lean_spec/spec/forks/lstar/forkchoice/test_attestation_target.pyuv run --group lint ruff format --check src/lean_spec/spec/forks/lstar/spec.py tests/lean_spec/spec/forks/lstar/forkchoice/test_attestation_target.pyuv run --group lint ty check src/lean_spec/spec/forks/lstar/spec.py tests/lean_spec/spec/forks/lstar/forkchoice/test_attestation_target.pygit diff --check