golang/go · error

Read after Close

Error message

Read after Close

What it means

Error "Read after Close" thrown in golang/go.

Source

Thrown at src/archive/zip/register.go:87

	fr, ok := flateReaderPool.Get().(io.ReadCloser)
	if ok {
		fr.(flate.Resetter).Reset(r, nil)
	} else {
		fr = flate.NewReader(r)
	}
	return &pooledFlateReader{fr: fr}
}

type pooledFlateReader struct {
	mu sync.Mutex // guards Close and Read
	fr io.ReadCloser
}

func (r *pooledFlateReader) Read(p []byte) (n int, err error) {
	r.mu.Lock()
	defer r.mu.Unlock()
	if r.fr == nil {
		return 0, errors.New("Read after Close")
	}
	return r.fr.Read(p)
}

func (r *pooledFlateReader) Close() error {
	r.mu.Lock()
	defer r.mu.Unlock()
	var err error
	if r.fr != nil {
		err = r.fr.Close()
		flateReaderPool.Put(r.fr)
		r.fr = nil
	}
	return err
}

var (
	compressors   sync.Map // map[uint16]Compressor

View on GitHub (pinned to b6b368adc5)

When it happens

Trigger: Thrown at src/archive/zip/register.go:87 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of golang/go@b6b368adc5 (2026-08-12). Data as JSON: /api/errors/c7128fc309434b37. Report an issue: GitHub.