diff options
| -rw-r--r-- | src/validation.cpp | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/src/validation.cpp b/src/validation.cpp index 5696684ed6..f0c4aba95f 100644 --- a/src/validation.cpp +++ b/src/validation.cpp @@ -3374,10 +3374,30 @@ bool CChainState::AcceptBlockHeader(const CBlockHeader& block, CValidationState& if (!ContextualCheckBlockHeader(block, state, chainparams, pindexPrev, GetAdjustedTime())) return error("%s: Consensus::ContextualCheckBlockHeader: %s, %s", __func__, hash.ToString(), FormatStateMessage(state)); - // If the previous block index isn't valid, determine if it descends from any block which - // has been found invalid (m_failed_blocks), then mark pindexPrev and any blocks - // between them as failed. + /* Determine if this block descends from any block which has been found + * invalid (m_failed_blocks), then mark pindexPrev and any blocks between + * them as failed. For example: + * + * D3 + * / + * B2 - C2 + * / \ + * A D2 - E2 - F2 + * \ + * B1 - C1 - D1 - E1 + * + * In the case that we attempted to reorg from E1 to F2, only to find + * C2 to be invalid, we would mark D2, E2, and F2 as BLOCK_FAILED_CHILD + * but NOT D3 (it was not in any of our candidate sets at the time). + * + * In any case D3 will also be marked as BLOCK_FAILED_CHILD at restart + * in LoadBlockIndex. + */ if (!pindexPrev->IsValid(BLOCK_VALID_SCRIPTS)) { + // The above does not mean "invalid": it checks if the previous block + // hasn't been validated up to BLOCK_VALID_SCRIPTS. This is a performance + // optimization, in the common case of adding a new block to the tip, + // we don't need to iterate over the failed blocks list. for (const CBlockIndex* failedit : m_failed_blocks) { if (pindexPrev->GetAncestor(failedit->nHeight) == failedit) { assert(failedit->nStatus & BLOCK_FAILED_VALID); |