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Merge bitcoin#24138: index: Commit MuHash and best block together for…
… coinstatsindex 691d45f Add coinstatsindex_unclean_shutdown test (Ryan Ofsky) eb6cc05 index: Commit DB_MUHASH and DB_BEST_BLOCK to disk together (Martin Zumsande) Pull request description: Fixes bitcoin#24076 Coinstatsindex currently writes the MuHash (`DB_MUHASH`) to disk in `CoinStatsIndex::WriteBlock()` and `CoinStatsIndex::ReverseBlock()`, but the best synced block is written in `BaseIndex::Commit()`. These are called at different points in time, both during the ThreadSync phase, and also after the initial sync is finished and validation callbacks (`BlockConnected()` vs `ChainStateFlushed()`) perform the syncing. As a result, the index DB is temporarily in an inconsistent state, and if bitcoind is terminated uncleanly (so that there is no time to call `Commit()` by receiving an interrupt or by flushing the chainstate) this leads to problems: On the next startup, `Init()` will read the best block and a MuHash that corresponds to a different (higher) block. Indexing will be picked up at the the best block processing some blocks again, but since MuHash is a rolling hash, it will process some utxos twice and the muhashes for all future blocks will be wrong, as was observed in bitcoin#24076. Fix this by always committing `DB_MUHASH` together with `DB_BEST_BLOCK`. Note that the block data for the index is still written at different times, but this does not corrupt the index - at worst, these entries will be processed another time and overwritten after an unclean shutdown and restart. ACKs for top commit: ryanofsky: Code review ACK 691d45f. Only change since last review is adding test fjahr: ACK 691d45f Tree-SHA512: e1c3b5f06fa4baacd1b070abb0f8111fe2ea4a001ca8b8bf892e96597cf8b5d5ea10fa8fb837cfbf46648f052c742d912add4ce26d4406294fc5fc20809a0e1b
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