grafana/k6 · error

cannot generate new sequence for value %d

Error message

cannot generate new sequence for value %d

What it means

GetNewExecutionSegmentSequenceFromValue could not distribute the given value across the segment sequence — the striping/scaling arithmetic yielded no valid new sequence for that total. An internal consistency guard in ExecutionTuple redistribution (used when rescaling work across a new VU count).

Source

Thrown at lib/execution_segment.go:628

}

// GetNewExecutionSegmentSequenceFromValue uses the value provided, splits it
// between all the segments, using the striping offsets in the sequence,
// generating a new segment sequence. It then returns a new
// ExecutionSegmentSequenceWrapper, with the new sequence and segments, such
// that each new segment in the new sequence has length `Scale(value)/value`
// while keeping the order.
//
// Additionally, the position of a given segment index can be tracked (since
// empty segments are removed), so that you can reconstruct an ExecutionTuple,
// if required. If the segment with the trackedIndex is not part of the new
// sequence, or if a new sequence cannot be generated (for example, for 0
// values), an error will be returned.
func (essw *ExecutionSegmentSequenceWrapper) GetNewExecutionSegmentSequenceFromValue(value int64, trackedIndex int) (
	newSequence *ExecutionSegmentSequenceWrapper, newIndex int, err error,
) {
	if value < 1 {
		return nil, -1, fmt.Errorf("cannot generate new sequence for value %d", value)
	}

	if value%essw.lcd == 0 { // the value is perfectly divisible so we will get the same tuple
		return essw, trackedIndex, nil
	}

	newIndex = -1
	newESS := make(ExecutionSegmentSequence, 0, len(essw.ExecutionSegmentSequence)) // this can be smaller

	prev := int64(0)
	for i := range essw.ExecutionSegmentSequence {
		newValue := essw.ScaleInt64(i, value)
		if newValue == 0 {
			continue
		}
		currentES := newExecutionSegment(big.NewRat(prev, value), big.NewRat(prev+newValue, value))
		prev += newValue
		if i == trackedIndex {

View on GitHub (pinned to 01ffac6f24)

Solutions

1. Use a value (total VU/iteration count) that can be distributed across the configured segments
2. Simplify the execution segment configuration if redistribution keeps failing

When it happens

Trigger: Thrown at lib/execution_segment.go:628 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@01ffac6f24 (2026-08-18). Data as JSON: /api/errors/90ce0518ebe21d5e. Report an issue: GitHub.