df0ff5f0fb
When initializing from a state that's not aligned to an epoch boundary, an earlier state is loaded that's epoch aligned, and subsequently topped up with the missing blocks. `dag.headSyncCommittee` is initialized prior to topping up the missing blocks, though. If the sync committee changes while applying the blocks (e.g., a sync committee period boundary hits), the cached information becomes unlinked from `dag.head`, leading to valid blocks based on that chain being rejected. To fix this, move cache initialization after the top up with blocks. This has been observed on Goerli by initializing from 7919502 and attempting to top up 7920111. The block gets rejected with an invalid state root on nodes that have restarted after setting 7920111 as head, while it gets accepted by all other nodes. Error message is `block: state root verification failed`. The incorrect initialization behaviour was introduced in #4592, before which the sync committee cache was initialized after applying blocks. |
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| .. | ||
| vanity_logs | ||
| README.md | ||
| attestation_pool.nim | ||
| blob_quarantine.nim | ||
| block_clearance.nim | ||
| block_dag.nim | ||
| block_pools_types.nim | ||
| block_pools_types_light_client.nim | ||
| block_quarantine.nim | ||
| blockchain_dag.nim | ||
| blockchain_dag_light_client.nim | ||
| common_tools.nim | ||
| consensus_manager.nim | ||
| light_client_pool.nim | ||
| spec_cache.nim | ||
| sync_committee_msg_pool.nim | ||
| validator_change_pool.nim | ||
README.md
Consensus object pools
This folder holds the various consensus object pools needed for a blockchain client.
Object in those pools have passed the "gossip validation" filter according to specs:
- blocks: https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/p2p-interface.md#beacon_block
- aggregate attestations: https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
- unaggregated attestation: https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
- voluntary exits: https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/p2p-interface.md#voluntary_exit
- Attester slashings: https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/phase0/p2p-interface.md#attester_slashing
- Proposer slashings: https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/phase0/p2p-interface.md#proposer_slashing
After "gossip validation" the consensus objects can be rebroadcasted as they are optimistically good, however for internal processing further verification is needed. For blocks, this means verifying state transition and all contained cryptographic signatures (instead of just the proposer signature). For other consensus objects, it is possible that gossip validation is a superset of consensus verification (TODO).
The pools presenet in this folder are:
- block_pools:
- block_quarantine: for seemingly valid blocks that are on a fork unknown to us.
- block_clearance: to verify (state_transition + cryptography) candidate blocks.
- blockchain_dag: an in-memory direct-acyclic graph of fully validated and verified blockchain candidates with the tail being the last finalized epoch. A block in the DAG MUST be in the fork choice and a block in the fork choice MUST be in the DAG (except for orphans following finalization). On finalization non-empty epoch blocks are stored in the beacon_chain_db.
- attestation_pool: Handles the attestation received from gossip and collect them for fork choice.
- validator_change_pool: Handle voluntary exits and forced exits (attester slashings and proposer slashings)