diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/init.cpp | 31 | ||||
| -rw-r--r-- | src/rpc/blockchain.cpp | 6 | ||||
| -rw-r--r-- | src/validation.cpp | 307 | ||||
| -rw-r--r-- | src/validation.h | 2 |
4 files changed, 210 insertions, 136 deletions
diff --git a/src/init.cpp b/src/init.cpp index 8876b54fde..d0933766a5 100644 --- a/src/init.cpp +++ b/src/init.cpp @@ -1468,11 +1468,11 @@ bool AppInitMain(InitInterfaces& interfaces) uiInterface.InitMessage(_("Loading block index...")); - LOCK(cs_main); - do { const int64_t load_block_index_start_time = GetTimeMillis(); + bool is_coinsview_empty; try { + LOCK(cs_main); UnloadBlockIndex(); pcoinsTip.reset(); pcoinsdbview.reset(); @@ -1544,7 +1544,7 @@ bool AppInitMain(InitInterfaces& interfaces) // The on-disk coinsdb is now in a good state, create the cache pcoinsTip.reset(new CCoinsViewCache(pcoinscatcher.get())); - bool is_coinsview_empty = fReset || fReindexChainState || pcoinsTip->GetBestBlock().IsNull(); + is_coinsview_empty = fReset || fReindexChainState || pcoinsTip->GetBestBlock().IsNull(); if (!is_coinsview_empty) { // LoadChainTip sets chainActive based on pcoinsTip's best block if (!LoadChainTip(chainparams)) { @@ -1553,18 +1553,25 @@ bool AppInitMain(InitInterfaces& interfaces) } assert(chainActive.Tip() != nullptr); } + } catch (const std::exception& e) { + LogPrintf("%s\n", e.what()); + strLoadError = _("Error opening block database"); + break; + } - if (!fReset) { - // Note that RewindBlockIndex MUST run even if we're about to -reindex-chainstate. - // It both disconnects blocks based on chainActive, and drops block data in - // mapBlockIndex based on lack of available witness data. - uiInterface.InitMessage(_("Rewinding blocks...")); - if (!RewindBlockIndex(chainparams)) { - strLoadError = _("Unable to rewind the database to a pre-fork state. You will need to redownload the blockchain"); - break; - } + if (!fReset) { + // Note that RewindBlockIndex MUST run even if we're about to -reindex-chainstate. + // It both disconnects blocks based on chainActive, and drops block data in + // mapBlockIndex based on lack of available witness data. + uiInterface.InitMessage(_("Rewinding blocks...")); + if (!RewindBlockIndex(chainparams)) { + strLoadError = _("Unable to rewind the database to a pre-fork state. You will need to redownload the blockchain"); + break; } + } + try { + LOCK(cs_main); if (!is_coinsview_empty) { uiInterface.InitMessage(_("Verifying blocks...")); if (fHavePruned && gArgs.GetArg("-checkblocks", DEFAULT_CHECKBLOCKS) > MIN_BLOCKS_TO_KEEP) { diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp index 7e8e5e07d0..6fa472d442 100644 --- a/src/rpc/blockchain.cpp +++ b/src/rpc/blockchain.cpp @@ -1583,15 +1583,15 @@ static UniValue invalidateblock(const JSONRPCRequest& request) uint256 hash(ParseHashV(request.params[0], "blockhash")); CValidationState state; + CBlockIndex* pblockindex; { LOCK(cs_main); - CBlockIndex* pblockindex = LookupBlockIndex(hash); + pblockindex = LookupBlockIndex(hash); if (!pblockindex) { throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found"); } - - InvalidateBlock(state, Params(), pblockindex); } + InvalidateBlock(state, Params(), pblockindex); if (state.IsValid()) { ActivateBestChain(state, Params()); diff --git a/src/validation.cpp b/src/validation.cpp index f3d34dca70..0f860a4f13 100644 --- a/src/validation.cpp +++ b/src/validation.cpp @@ -177,7 +177,7 @@ public: // Manual block validity manipulation: bool PreciousBlock(CValidationState& state, const CChainParams& params, CBlockIndex* pindex) LOCKS_EXCLUDED(cs_main); - bool InvalidateBlock(CValidationState& state, const CChainParams& chainparams, CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main); + bool InvalidateBlock(CValidationState& state, const CChainParams& chainparams, CBlockIndex* pindex); void ResetBlockFailureFlags(CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main); bool ReplayBlocks(const CChainParams& params, CCoinsView* view); @@ -206,8 +206,10 @@ private: CBlockIndex* FindMostWorkChain() EXCLUSIVE_LOCKS_REQUIRED(cs_main); void ReceivedBlockTransactions(const CBlock& block, CBlockIndex* pindexNew, const CDiskBlockPos& pos, const Consensus::Params& consensusParams) EXCLUSIVE_LOCKS_REQUIRED(cs_main); - bool RollforwardBlock(const CBlockIndex* pindex, CCoinsViewCache& inputs, const CChainParams& params) EXCLUSIVE_LOCKS_REQUIRED(cs_main); + + //! Mark a block as not having block data + void EraseBlockData(CBlockIndex* index) EXCLUSIVE_LOCKS_REQUIRED(cs_main); } g_chainstate; /** @@ -2634,6 +2636,14 @@ static void NotifyHeaderTip() LOCKS_EXCLUDED(cs_main) { } } +static void LimitValidationInterfaceQueue() { + AssertLockNotHeld(cs_main); + + if (GetMainSignals().CallbacksPending() > 10) { + SyncWithValidationInterfaceQueue(); + } +} + /** * Make the best chain active, in multiple steps. The result is either failure * or an activated best chain. pblock is either nullptr or a pointer to a block @@ -2662,15 +2672,13 @@ bool CChainState::ActivateBestChain(CValidationState &state, const CChainParams& do { boost::this_thread::interruption_point(); - if (GetMainSignals().CallbacksPending() > 10) { - // Block until the validation queue drains. This should largely - // never happen in normal operation, however may happen during - // reindex, causing memory blowup if we run too far ahead. - // Note that if a validationinterface callback ends up calling - // ActivateBestChain this may lead to a deadlock! We should - // probably have a DEBUG_LOCKORDER test for this in the future. - SyncWithValidationInterfaceQueue(); - } + // Block until the validation queue drains. This should largely + // never happen in normal operation, however may happen during + // reindex, causing memory blowup if we run too far ahead. + // Note that if a validationinterface callback ends up calling + // ActivateBestChain this may lead to a deadlock! We should + // probably have a DEBUG_LOCKORDER test for this in the future. + LimitValidationInterfaceQueue(); { LOCK(cs_main); @@ -2781,64 +2789,85 @@ bool PreciousBlock(CValidationState& state, const CChainParams& params, CBlockIn bool CChainState::InvalidateBlock(CValidationState& state, const CChainParams& chainparams, CBlockIndex *pindex) { - AssertLockHeld(cs_main); + CBlockIndex* to_mark_failed = pindex; + bool pindex_was_in_chain = false; + int disconnected = 0; - // We first disconnect backwards and then mark the blocks as invalid. - // This prevents a case where pruned nodes may fail to invalidateblock - // and be left unable to start as they have no tip candidates (as there - // are no blocks that meet the "have data and are not invalid per - // nStatus" criteria for inclusion in setBlockIndexCandidates). + // Disconnect (descendants of) pindex, and mark them invalid. + while (true) { + if (ShutdownRequested()) break; - bool pindex_was_in_chain = false; - CBlockIndex *invalid_walk_tip = chainActive.Tip(); + // Make sure the queue of validation callbacks doesn't grow unboundedly. + LimitValidationInterfaceQueue(); - DisconnectedBlockTransactions disconnectpool; - while (chainActive.Contains(pindex)) { + LOCK(cs_main); + if (!chainActive.Contains(pindex)) break; pindex_was_in_chain = true; + CBlockIndex *invalid_walk_tip = chainActive.Tip(); + // ActivateBestChain considers blocks already in chainActive // unconditionally valid already, so force disconnect away from it. - if (!DisconnectTip(state, chainparams, &disconnectpool)) { - // It's probably hopeless to try to make the mempool consistent - // here if DisconnectTip failed, but we can try. - UpdateMempoolForReorg(disconnectpool, false); - return false; - } - } - - // Now mark the blocks we just disconnected as descendants invalid - // (note this may not be all descendants). - while (pindex_was_in_chain && invalid_walk_tip != pindex) { - invalid_walk_tip->nStatus |= BLOCK_FAILED_CHILD; + DisconnectedBlockTransactions disconnectpool; + bool ret = DisconnectTip(state, chainparams, &disconnectpool); + // DisconnectTip will add transactions to disconnectpool. + // Adjust the mempool to be consistent with the new tip, adding + // transactions back to the mempool if disconnecting was succesful, + // and we're not doing a very deep invalidation (in which case + // keeping the mempool up to date is probably futile anyway). + UpdateMempoolForReorg(disconnectpool, /* fAddToMempool = */ (++disconnected <= 10) && ret); + if (!ret) return false; + assert(invalid_walk_tip->pprev == chainActive.Tip()); + + // We immediately mark the disconnected blocks as invalid. + // This prevents a case where pruned nodes may fail to invalidateblock + // and be left unable to start as they have no tip candidates (as there + // are no blocks that meet the "have data and are not invalid per + // nStatus" criteria for inclusion in setBlockIndexCandidates). + invalid_walk_tip->nStatus |= BLOCK_FAILED_VALID; setDirtyBlockIndex.insert(invalid_walk_tip); setBlockIndexCandidates.erase(invalid_walk_tip); - invalid_walk_tip = invalid_walk_tip->pprev; + setBlockIndexCandidates.insert(invalid_walk_tip->pprev); + if (invalid_walk_tip->pprev == to_mark_failed && (to_mark_failed->nStatus & BLOCK_FAILED_VALID)) { + // We only want to mark the last disconnected block as BLOCK_FAILED_VALID; its children + // need to be BLOCK_FAILED_CHILD instead. + to_mark_failed->nStatus = (to_mark_failed->nStatus ^ BLOCK_FAILED_VALID) | BLOCK_FAILED_CHILD; + setDirtyBlockIndex.insert(to_mark_failed); + } + + // Track the last disconnected block, so we can correct its BLOCK_FAILED_CHILD status in future + // iterations, or, if it's the last one, call InvalidChainFound on it. + to_mark_failed = invalid_walk_tip; } - // Mark the block itself as invalid. - pindex->nStatus |= BLOCK_FAILED_VALID; - setDirtyBlockIndex.insert(pindex); - setBlockIndexCandidates.erase(pindex); - m_failed_blocks.insert(pindex); + { + LOCK(cs_main); + if (chainActive.Contains(to_mark_failed)) { + // If the to-be-marked invalid block is in the active chain, something is interfering and we can't proceed. + return false; + } - // DisconnectTip will add transactions to disconnectpool; try to add these - // back to the mempool. - UpdateMempoolForReorg(disconnectpool, true); + // Mark pindex (or the last disconnected block) as invalid, even when it never was in the main chain + to_mark_failed->nStatus |= BLOCK_FAILED_VALID; + setDirtyBlockIndex.insert(to_mark_failed); + setBlockIndexCandidates.erase(to_mark_failed); + m_failed_blocks.insert(to_mark_failed); - // The resulting new best tip may not be in setBlockIndexCandidates anymore, so - // add it again. - BlockMap::iterator it = mapBlockIndex.begin(); - while (it != mapBlockIndex.end()) { - if (it->second->IsValid(BLOCK_VALID_TRANSACTIONS) && it->second->HaveTxsDownloaded() && !setBlockIndexCandidates.value_comp()(it->second, chainActive.Tip())) { - setBlockIndexCandidates.insert(it->second); + // The resulting new best tip may not be in setBlockIndexCandidates anymore, so + // add it again. + BlockMap::iterator it = mapBlockIndex.begin(); + while (it != mapBlockIndex.end()) { + if (it->second->IsValid(BLOCK_VALID_TRANSACTIONS) && it->second->HaveTxsDownloaded() && !setBlockIndexCandidates.value_comp()(it->second, chainActive.Tip())) { + setBlockIndexCandidates.insert(it->second); + } + it++; } - it++; - } - InvalidChainFound(pindex); + InvalidChainFound(to_mark_failed); + } // Only notify about a new block tip if the active chain was modified. if (pindex_was_in_chain) { - uiInterface.NotifyBlockTip(IsInitialBlockDownload(), pindex->pprev); + uiInterface.NotifyBlockTip(IsInitialBlockDownload(), to_mark_failed->pprev); } return true; } @@ -4162,38 +4191,114 @@ bool ReplayBlocks(const CChainParams& params, CCoinsView* view) { return g_chainstate.ReplayBlocks(params, view); } -bool CChainState::RewindBlockIndex(const CChainParams& params) +//! Helper for CChainState::RewindBlockIndex +void CChainState::EraseBlockData(CBlockIndex* index) { - LOCK(cs_main); + AssertLockHeld(cs_main); + assert(!chainActive.Contains(index)); // Make sure this block isn't active + + // Reduce validity + index->nStatus = std::min<unsigned int>(index->nStatus & BLOCK_VALID_MASK, BLOCK_VALID_TREE) | (index->nStatus & ~BLOCK_VALID_MASK); + // Remove have-data flags. + index->nStatus &= ~(BLOCK_HAVE_DATA | BLOCK_HAVE_UNDO); + // Remove storage location. + index->nFile = 0; + index->nDataPos = 0; + index->nUndoPos = 0; + // Remove various other things + index->nTx = 0; + index->nChainTx = 0; + index->nSequenceId = 0; + // Make sure it gets written. + setDirtyBlockIndex.insert(index); + // Update indexes + setBlockIndexCandidates.erase(index); + std::pair<std::multimap<CBlockIndex*, CBlockIndex*>::iterator, std::multimap<CBlockIndex*, CBlockIndex*>::iterator> ret = mapBlocksUnlinked.equal_range(index->pprev); + while (ret.first != ret.second) { + if (ret.first->second == index) { + mapBlocksUnlinked.erase(ret.first++); + } else { + ++ret.first; + } + } + // Mark parent as eligible for main chain again + if (index->pprev && index->pprev->IsValid(BLOCK_VALID_TRANSACTIONS) && index->pprev->HaveTxsDownloaded()) { + setBlockIndexCandidates.insert(index->pprev); + } +} +bool CChainState::RewindBlockIndex(const CChainParams& params) +{ // Note that during -reindex-chainstate we are called with an empty chainActive! - int nHeight = 1; - while (nHeight <= chainActive.Height()) { - // Although SCRIPT_VERIFY_WITNESS is now generally enforced on all - // blocks in ConnectBlock, we don't need to go back and - // re-download/re-verify blocks from before segwit actually activated. - if (IsWitnessEnabled(chainActive[nHeight - 1], params.GetConsensus()) && !(chainActive[nHeight]->nStatus & BLOCK_OPT_WITNESS)) { - break; + // First erase all post-segwit blocks without witness not in the main chain, + // as this can we done without costly DisconnectTip calls. Active + // blocks will be dealt with below (releasing cs_main in between). + { + LOCK(cs_main); + for (const auto& entry : mapBlockIndex) { + if (IsWitnessEnabled(entry.second->pprev, params.GetConsensus()) && !(entry.second->nStatus & BLOCK_OPT_WITNESS) && !chainActive.Contains(entry.second)) { + EraseBlockData(entry.second); + } } - nHeight++; } + // Find what height we need to reorganize to. + CBlockIndex *tip; + int nHeight = 1; + { + LOCK(cs_main); + while (nHeight <= chainActive.Height()) { + // Although SCRIPT_VERIFY_WITNESS is now generally enforced on all + // blocks in ConnectBlock, we don't need to go back and + // re-download/re-verify blocks from before segwit actually activated. + if (IsWitnessEnabled(chainActive[nHeight - 1], params.GetConsensus()) && !(chainActive[nHeight]->nStatus & BLOCK_OPT_WITNESS)) { + break; + } + nHeight++; + } + + tip = chainActive.Tip(); + } // nHeight is now the height of the first insufficiently-validated block, or tipheight + 1 + CValidationState state; - CBlockIndex* pindex = chainActive.Tip(); - while (chainActive.Height() >= nHeight) { - if (fPruneMode && !(chainActive.Tip()->nStatus & BLOCK_HAVE_DATA)) { - // If pruning, don't try rewinding past the HAVE_DATA point; - // since older blocks can't be served anyway, there's - // no need to walk further, and trying to DisconnectTip() - // will fail (and require a needless reindex/redownload - // of the blockchain). - break; - } - if (!DisconnectTip(state, params, nullptr)) { - return error("RewindBlockIndex: unable to disconnect block at height %i (%s)", pindex->nHeight, FormatStateMessage(state)); + // Loop until the tip is below nHeight, or we reach a pruned block. + while (!ShutdownRequested()) { + { + LOCK(cs_main); + // Make sure nothing changed from under us (this won't happen because RewindBlockIndex runs before importing/network are active) + assert(tip == chainActive.Tip()); + if (tip == nullptr || tip->nHeight < nHeight) break; + if (fPruneMode && !(tip->nStatus & BLOCK_HAVE_DATA)) { + // If pruning, don't try rewinding past the HAVE_DATA point; + // since older blocks can't be served anyway, there's + // no need to walk further, and trying to DisconnectTip() + // will fail (and require a needless reindex/redownload + // of the blockchain). + break; + } + + // Disconnect block + if (!DisconnectTip(state, params, nullptr)) { + return error("RewindBlockIndex: unable to disconnect block at height %i (%s)", tip->nHeight, FormatStateMessage(state)); + } + + // Reduce validity flag and have-data flags. + // We do this after actual disconnecting, otherwise we'll end up writing the lack of data + // to disk before writing the chainstate, resulting in a failure to continue if interrupted. + // Note: If we encounter an insufficiently validated block that + // is on chainActive, it must be because we are a pruning node, and + // this block or some successor doesn't HAVE_DATA, so we were unable to + // rewind all the way. Blocks remaining on chainActive at this point + // must not have their validity reduced. + EraseBlockData(tip); + + tip = tip->pprev; } + // Make sure the queue of validation callbacks doesn't grow unboundedly. + LimitValidationInterfaceQueue(); + // Occasionally flush state to disk. if (!FlushStateToDisk(params, state, FlushStateMode::PERIODIC)) { LogPrintf("RewindBlockIndex: unable to flush state to disk (%s)\n", FormatStateMessage(state)); @@ -4201,53 +4306,15 @@ bool CChainState::RewindBlockIndex(const CChainParams& params) } } - // Reduce validity flag and have-data flags. - // We do this after actual disconnecting, otherwise we'll end up writing the lack of data - // to disk before writing the chainstate, resulting in a failure to continue if interrupted. - for (const auto& entry : mapBlockIndex) { - CBlockIndex* pindexIter = entry.second; - - // Note: If we encounter an insufficiently validated block that - // is on chainActive, it must be because we are a pruning node, and - // this block or some successor doesn't HAVE_DATA, so we were unable to - // rewind all the way. Blocks remaining on chainActive at this point - // must not have their validity reduced. - if (IsWitnessEnabled(pindexIter->pprev, params.GetConsensus()) && !(pindexIter->nStatus & BLOCK_OPT_WITNESS) && !chainActive.Contains(pindexIter)) { - // Reduce validity - pindexIter->nStatus = std::min<unsigned int>(pindexIter->nStatus & BLOCK_VALID_MASK, BLOCK_VALID_TREE) | (pindexIter->nStatus & ~BLOCK_VALID_MASK); - // Remove have-data flags. - pindexIter->nStatus &= ~(BLOCK_HAVE_DATA | BLOCK_HAVE_UNDO); - // Remove storage location. - pindexIter->nFile = 0; - pindexIter->nDataPos = 0; - pindexIter->nUndoPos = 0; - // Remove various other things - pindexIter->nTx = 0; - pindexIter->nChainTx = 0; - pindexIter->nSequenceId = 0; - // Make sure it gets written. - setDirtyBlockIndex.insert(pindexIter); - // Update indexes - setBlockIndexCandidates.erase(pindexIter); - std::pair<std::multimap<CBlockIndex*, CBlockIndex*>::iterator, std::multimap<CBlockIndex*, CBlockIndex*>::iterator> ret = mapBlocksUnlinked.equal_range(pindexIter->pprev); - while (ret.first != ret.second) { - if (ret.first->second == pindexIter) { - mapBlocksUnlinked.erase(ret.first++); - } else { - ++ret.first; - } - } - } else if (pindexIter->IsValid(BLOCK_VALID_TRANSACTIONS) && pindexIter->HaveTxsDownloaded()) { - setBlockIndexCandidates.insert(pindexIter); - } - } - - if (chainActive.Tip() != nullptr) { - // We can't prune block index candidates based on our tip if we have - // no tip due to chainActive being empty! - PruneBlockIndexCandidates(); + { + LOCK(cs_main); + if (chainActive.Tip() != nullptr) { + // We can't prune block index candidates based on our tip if we have + // no tip due to chainActive being empty! + PruneBlockIndexCandidates(); - CheckBlockIndex(params.GetConsensus()); + CheckBlockIndex(params.GetConsensus()); + } } return true; diff --git a/src/validation.h b/src/validation.h index 1975846b69..65a378d8ba 100644 --- a/src/validation.h +++ b/src/validation.h @@ -448,7 +448,7 @@ CBlockIndex* FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& loc bool PreciousBlock(CValidationState& state, const CChainParams& params, CBlockIndex *pindex) LOCKS_EXCLUDED(cs_main); /** Mark a block as invalid. */ -bool InvalidateBlock(CValidationState& state, const CChainParams& chainparams, CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main); +bool InvalidateBlock(CValidationState& state, const CChainParams& chainparams, CBlockIndex* pindex); /** Remove invalidity status from a block and its descendants. */ void ResetBlockFailureFlags(CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main); |