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fix: reduce GETBLOCKTXN disk read lock scope #7350

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fix: reduce GETBLOCKTXN disk read lock scope #7350

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17 changes: 13 additions & 4 deletions src/net_processing.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -145,6 +145,7 @@ static constexpr auto BLOCK_STALLING_TIMEOUT_MAX{64s};
static const int MAX_CMPCTBLOCK_DEPTH = 5;
/** Maximum depth of blocks we're willing to respond to GETBLOCKTXN requests for. */
static const int MAX_BLOCKTXN_DEPTH = 10;
static_assert(MAX_BLOCKTXN_DEPTH <= MIN_BLOCKS_TO_KEEP, "MAX_BLOCKTXN_DEPTH too high");
/** Size of the "block download window": how far ahead of our current height do we fetch?
* Larger windows tolerate larger download speed differences between peer, but increase the potential
* degree of disordering of blocks on disk (which make reindexing and pruning harder). We'll probably
Expand Down Expand Up @@ -4501,6 +4502,7 @@ void PeerManagerImpl::ProcessMessage(
return;
}

FlatFilePos block_pos{};
{
LOCK(cs_main);

Expand All @@ -4511,13 +4513,20 @@ void PeerManagerImpl::ProcessMessage(
}

if (pindex->nHeight >= m_chainman.ActiveChain().Height() - MAX_BLOCKTXN_DEPTH) {
CBlock block;
bool ret = ReadBlockFromDisk(block, pindex, m_chainparams.GetConsensus());
assert(ret);
block_pos = pindex->GetBlockPos();
}
}

SendBlockTransactions(pfrom, block, req);
if (!block_pos.IsNull()) {
CBlock block;
const auto hash = ReadBlockFromDisk(block, block_pos, m_chainparams.GetConsensus());
if (!hash || *hash != req.blockhash) {
LogPrint(BCLog::NET, "Peer %d sent us a getblocktxn for a block we could not read\n", pfrom.GetId());
return;
Comment on lines +4523 to 4525

@thepastaclaw thepastaclaw Jun 9, 2026

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💬 Nitpick: Log message conflates I/O failure with hash mismatch

After dropping cs_main, the failure path emits the same "a block we could not read" line for two distinct conditions: ReadBlockFromDisk returning nullopt (open/deserialize/PoW failure) and the read succeeding with *hash != req.blockhash (a stale FlatFilePos / disk-state inconsistency after the lock was released). Distinguishing these helps operators tell transient I/O or pruning issues from a position-vs-hash race. Diagnostic quality only; not a defect.

source: ['claude']

}

SendBlockTransactions(pfrom, block, req);
return;
}

// If an older block is requested (should never happen in practice,
Expand Down
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