validateAndPrepare() method should have been called before c

Error message

validateAndPrepare() method should have been called before calling commit()

What it means

LockBasedTxMgr.Commit enforces the lifecycle validateAndPrepare() -> commit(). currentUpdates is only set by validateAndPrepare; committing without it means the batch was never staged, so the manager panics to prevent committing an undefined set of updates.

Source

Thrown at core/ledger/kvledger/txmgmt/txmgr/lockbased_txmgr.go:536

	defer txmgr.oldBlockCommit.Unlock()
	logger.Debug("lock acquired on oldBlockCommit for committing regular updates to state database")

	// When using the purge manager for the first block commit after peer start, the asynchronous function
	// 'PrepareForExpiringKeys' is invoked in-line. However, for the subsequent blocks commits, this function is invoked
	// in advance for the next block
	if !txmgr.pvtdataPurgeMgr.usedOnce {
		txmgr.pvtdataPurgeMgr.PrepareForExpiringKeys(txmgr.currentUpdates.blockNum())
		txmgr.pvtdataPurgeMgr.usedOnce = true
	}
	defer func() {
		txmgr.pvtdataPurgeMgr.PrepareForExpiringKeys(txmgr.currentUpdates.blockNum() + 1)
		logger.Debugf("launched the background routine for preparing keys to purge with the next block")
		txmgr.reset()
	}()

	logger.Debugf("Committing updates to state database")
	if txmgr.currentUpdates == nil {
		panic("validateAndPrepare() method should have been called before calling commit()")
	}

	if err := txmgr.pvtdataPurgeMgr.UpdateExpiryInfo(
		txmgr.currentUpdates.batch.PvtUpdates, txmgr.currentUpdates.batch.HashUpdates,
	); err != nil {
		return err
	}

	if err := txmgr.pvtdataPurgeMgr.AddExpiredEntriesToUpdateBatch(
		txmgr.currentUpdates.batch.PvtUpdates, txmgr.currentUpdates.batch.HashUpdates,
	); err != nil {
		return err
	}

	commitHeight := version.NewHeight(txmgr.currentUpdates.blockNum(), txmgr.currentUpdates.maxTxNumber())
	txmgr.commitRWLock.Lock()
	logger.Debugf("Write lock acquired for committing updates to state database")
	if err := txmgr.db.ApplyPrivacyAwareUpdates(txmgr.currentUpdates.batch, commitHeight); err != nil {

View on GitHub (pinned to 2736b63f8f)

Solutions

Always call validateAndPrepare(block) before Commit() in the same block-processing sequence.
If writing a test, replicate the full commit flow: txmgr.ValidateAndPrepareKVReads/validateAndPrepare then Commit.
Check that no code path calls txmgr.reset() between validateAndPrepare and Commit.
If using higher-level APIs (CommitLostBlock, ledger commit path), ensure the internal sequence is intact rather than calling Commit directly.

Example fix

// before
txmgr.Commit()
// after
txmgr.validateAndPrepare(block) // stages currentUpdates
txmgr.Commit()

Defensive patterns

Strategy: try-catch

Try / catch

// Commit panics on lifecycle violation; wrap block-commit entry point
func safeCommit(txmgr *txmgr.LockBasedTxMgr, block *common.Block) (err error) {
  defer func() {
    if r := recover(); r != nil {
      err = fmt.Errorf("txmgr commit panic: %v", r)
    }
  }()
  txmgr.Commit()
  return nil
}

Prevention

Enforce the validateAndPrepare() -> Commit() ordering in all block-processing code
Never call txmgr.reset() between validateAndPrepare and Commit
Write tests that exercise the full prepare/commit cycle, not Commit in isolation
Prefer higher-level ledger commit APIs over direct txmgr.Commit calls

When it happens

Trigger: Calling Commit() on a LockBasedTxMgr without a preceding validateAndPrepare() call in the same block-processing cycle — e.g. custom code or tests invoking Commit directly, or a code path that resets the txmgr between prepare and commit.

Common situations: Test code simulating block commit that skips the validate step; custom block-processing integrations calling txmgr.Commit out of order; race conditions where reset() (scheduled in the background routine) runs before Commit.

Related errors

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/2a3a5e0be623798b. Report an issue: GitHub.