grafana/k6 · error

running on task queue: %w

Error message

running on task queue: %w

What it means

Error "running on task queue: %w" thrown in grafana/k6.

Source

Thrown at internal/js/modules/k6/browser/browser/helpers.go:129

	fn func() (T, error),
) (future func() (T, error)) {
	var (
		result T
		err    error
		done   = make(chan struct{})
	)
	tq.Queue(func() error {
		defer close(done)
		result, err = fn()
		return err
	})
	return func() (T, error) {
		select {
		case <-done:
			return result, err
		case <-ctx.Done():
			var zero T
			return zero, fmt.Errorf("running on task queue: %w", common.ContextErr(ctx))
		}
	}
}

// newTaskQueue returns a new [taskqueue.TaskQueue] that is closed after
// the returned cancel function is called or when the VU's context is done.
//
// Do not call this function off of the event loop.
func newTaskQueue(vu moduleVU) (*taskqueue.TaskQueue, context.Context, context.CancelFunc) {
	ctx, cancel := context.WithCancel(vu.Context())
	tq := taskqueue.New(vu.RegisterCallback)
	go func() {
		<-ctx.Done()
		tq.Close()
	}()
	return tq, ctx, cancel
}

View on GitHub (pinned to 93accf6570)

When it happens

Trigger: Thrown at internal/js/modules/k6/browser/browser/helpers.go:129 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/b5f94d5cb28eae14. Report an issue: GitHub.