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zeekay
4fe6fa1c2a
loadLayers() previously computed Keccak256Hash(nil) as the disk layer root for an unwritten DB, producing 0xc5d2…a470 — the keccak of zero bytes, NOT the canonical empty-trie root (0x56e81f…b421) that core/Genesis.toBlock uses as parentRoot when committing genesis. Consequence: layertree.add(root, parentRoot=EmptyRootHash) couldn't find a parent in the layer tree (only Keccak256Hash(nil) was there) and panicked with "triedb parent layer missing". Every fresh-launched chain on this fork (lqd primary network's C-Chain, every Liquidity local stack since the path-DB switch) failed to commit its genesis block, leaving block 0's stateRoot pointing at an empty trie no matter what `alloc` the genesis specified. Symptom: eth_getBalance "latest" returned the genesis-allocation values from in-memory cache, but every block-build saw "address has 0" and looped on BAD BLOCK. Fix: when ReadAccountTrieNode returns nil (no persistent state yet), short-circuit `root` to types.EmptyRootHash. Matches go-ethereum upstream and the contract that Genesis.toBlock + layertree.add rely on. Adds journal_freshdb_test.go with two regression tests: - the disk layer's root MUST be EmptyRootHash on a fresh DB - Update() onto EmptyRootHash parent succeeds (the genesis path) Without this fix, any future refactor that re-introduces an unconditional Keccak256Hash(nil) silently breaks fresh chains again.