hyperledger/fabric · error

block bytes for block num = [%d] should not be nil here. The

Error message

block bytes for block num = [%d] should not be nil here. The indexes for the block are already present

What it means

syncIndex internal consistency check: while rebuilding the index the stream returned nil block bytes for a block whose index entries already exist — local block files and index are inconsistent (corruption or crash during indexing).

Source

Thrown at common/ledger/blkstorage/blockfile_mgr.go:440

	}

	logger.Infof("Start building index from block [%d] to last block [%d]", nextIndexableBlock, mgr.blockfilesInfo.lastPersistedBlock)

	// open a blockstream to the file location that was stored in the index
	var stream *blockStream
	if stream, err = newBlockStream(mgr.rootDir, startFileNum, int64(startOffset), endFileNum); err != nil {
		return err
	}
	defer stream.close()
	var blockBytes []byte
	var blockPlacementInfo *blockPlacementInfo

	if skipFirstBlock {
		if blockBytes, _, err = stream.nextBlockBytesAndPlacementInfo(); err != nil {
			return err
		}
		if blockBytes == nil {
			return errors.Errorf("block bytes for block num = [%d] should not be nil here. The indexes for the block are already present",
				lastBlockIndexed)
		}
	}

	// Should be at the last block already, but go ahead and loop looking for next blockBytes.
	// If there is another block, add it to the index.
	// This will ensure block indexes are correct, for example if peer had crashed before indexes got updated.
	blockIdxInfo := &blockIdxInfo{}
	for {
		if blockBytes, blockPlacementInfo, err = stream.nextBlockBytesAndPlacementInfo(); err != nil {
			return err
		}
		if blockBytes == nil {
			break
		}
		info, err := extractSerializedBlockInfo(blockBytes)
		if err != nil {
			return err

View on GitHub (pinned to 2736b63f8f)

Solutions

1. Re-bootstrap the peer from a snapshot or genesis to rebuild consistent state
2. Investigate disk corruption of the block files under the ledger directory

When it happens

Trigger: Thrown at common/ledger/blkstorage/blockfile_mgr.go:440 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/c886ea443c61e30c. Report an issue: GitHub.