Compact committees root uses incorrect start shard #1315
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Indeed! fixing |
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Fixed in #1319 |
michaelsproul
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paulhauner
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* types: first updates for v0.8 * state_processing: epoch processing v0.8.0 * state_processing: block processing v0.8.0 * tree_hash_derive: support generics in SignedRoot * types v0.8: update to use ssz_types * state_processing v0.8: use ssz_types * ssz_types: add bitwise methods and from_elem * types: fix v0.8 FIXMEs * ssz_types: add bitfield shift_up * ssz_types: iterators and DerefMut for VariableList * types,state_processing: use VariableList * ssz_types: fix BitVector Decode impl Fixed a typo in the implementation of ssz::Decode for BitVector, which caused it to be considered variable length! * types: fix test modules for v0.8 update * types: remove slow type-level arithmetic * state_processing: fix tests for v0.8 * op_pool: update for v0.8 * ssz_types: Bitfield difference length-independent Allow computing the difference of two bitfields of different lengths. * Implement compact committee support * epoch_processing: committee & active index roots * state_processing: genesis state builder v0.8 * state_processing: implement v0.8.1 * Further improve tree_hash * Strip examples, tests from cached_tree_hash * Update TreeHash, un-impl CachedTreeHash * Update bitfield TreeHash, un-impl CachedTreeHash * Update FixedLenVec TreeHash, unimpl CachedTreeHash * Update update tree_hash_derive for new TreeHash * Fix TreeHash, un-impl CachedTreeHash for ssz_types * Remove fixed_len_vec, ssz benches SSZ benches relied upon fixed_len_vec -- it is easier to just delete them and rebuild them later (when necessary) * Remove boolean_bitfield crate * Fix fake_crypto BLS compile errors * Update ef_tests for new v.8 type params * Update ef_tests submodule to v0.8.1 tag * Make fixes to support parsing ssz ef_tests * `compact_committee...` to `compact_committees...` * Derive more traits for `CompactCommittee` * Flip bitfield byte-endianness * Fix tree_hash for bitfields * Modify CLI output for ef_tests * Bump ssz crate version * Update ssz_types doc comment * Del cached tree hash tests from ssz_static tests * Tidy SSZ dependencies * Rename ssz_types crate to eth2_ssz_types * validator_client: update for v0.8 * ssz_types: update union/difference for bit order swap * beacon_node: update for v0.8, EthSpec * types: disable cached tree hash, update min spec * state_processing: fix slot bug in committee update * tests: temporarily disable fork choice harness test See #447 * committee cache: prevent out-of-bounds access In the case where we tried to access the committee of a shard that didn't have a committee in the current epoch, we were accessing elements beyond the end of the shuffling vector and panicking! This commit adds a check to make the failure safe and explicit. * fix bug in get_indexed_attestation and simplify There was a bug in our implementation of get_indexed_attestation whereby incorrect "committee indices" were used to index into the custody bitfield. The bug was only observable in the case where some bits of the custody bitfield were set to 1. The implementation has been simplified to remove the bug, and a test added. * state_proc: workaround for compact committees bug ethereum/consensus-specs#1315 * v0.8: updates to make the EF tests pass * Remove redundant max operation checks. * Always supply both messages when checking attestation signatures -- allowing verification of an attestation with no signatures. * Swap the order of the fork and domain constant in `get_domain`, to match the spec. * rustfmt * ef_tests: add new epoch processing tests * Integrate v0.8 into master (compiles) * Remove unused crates, fix clippy lints * Replace v0.6.3 tags w/ v0.8.1 * Remove old comment * Ensure lmd ghost tests only run in release * Update readme
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In the
process_final_updatesfunction we increment the start shard by the shard delta before computing the compact committees root. This is problematic becauseget_compact_committees_rootcallsget_start_shard(alone and viaget_crosslink_committee) to work out the start shard and committees for the next epoch. Theget_start_shardfunction adds the shard delta to the state's already-incremented start shard, resulting in a start shard for the "next epoch" which has been double incremented. This shard is then used to calculate committees for the next epoch, yielding incorrect results (the committees it computes are not the committees that will be computed once the next epoch actually comes around).For example, with the minimal config that's used for the sanity tests, if we begin with the start shard equal to 0, it will get incremented to 7 as part of
process_final_updates, and then whenget_compact_committees_rootruns it will incorrectly see the next epoch's start shard as 6.The text was updated successfully, but these errors were encountered: