go-delve/delve · error

hit unmapped area at %v after %v bytes

Error message

hit unmapped area at %v after %v bytes

What it means

Error "hit unmapped area at %v after %v bytes" thrown in go-delve/delve.

Source

Thrown at pkg/proc/core/core.go:110

		default:
			panic(fmt.Sprintf("Unhandled case: existing entry is %v len %v, new is %v len %v", entry.offset, entry.length, off, length))
		}
	}
	if !inserted {
		newReaders = append(newReaders, readerEntry{off, length, reader})
	}
	r.readers = newReaders
}

// ReadMemory implements MemoryReader.ReadMemory.
func (r *SplicedMemory) ReadMemory(buf []byte, addr uint64) (n int, err error) {
	started := false
	for _, entry := range r.readers {
		if entry.offset+entry.length <= addr {
			if !started {
				continue
			}
			return n, fmt.Errorf("hit unmapped area at %v after %v bytes", addr, n)
		}

		// The reading of the memory has been started after the first iteration
		started = true

		// Don't go past the region.
		pb := buf
		if addr+uint64(len(buf)) > entry.offset+entry.length {
			pb = pb[:entry.offset+entry.length-addr]
		}
		pn, err := entry.reader.ReadMemory(pb, addr)
		n += pn
		if err != nil {
			return n, fmt.Errorf("error while reading spliced memory at %#x: %v", addr, err)
		}
		if pn != len(pb) {
			return n, nil
		}

View on GitHub (pinned to a23773e6c3)

When it happens

Trigger: Thrown at pkg/proc/core/core.go:110 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of go-delve/delve@a23773e6c3 (2026-08-31). Data as JSON: /api/errors/568be81ca82b879f. Report an issue: GitHub.