{"record":{"id":"568be81ca82b879f","repo":"go-delve/delve","slug":"hit-unmapped-area-at-v-after-v-bytes","errorCode":null,"errorMessage":"hit unmapped area at %v after %v bytes","messagePattern":"hit unmapped area at (.+?) after (.+?) bytes","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/proc/core/core.go","lineNumber":110,"sourceCode":"\t\tdefault:\n\t\t\tpanic(fmt.Sprintf(\"Unhandled case: existing entry is %v len %v, new is %v len %v\", entry.offset, entry.length, off, length))\n\t\t}\n\t}\n\tif !inserted {\n\t\tnewReaders = append(newReaders, readerEntry{off, length, reader})\n\t}\n\tr.readers = newReaders\n}\n\n// ReadMemory implements MemoryReader.ReadMemory.\nfunc (r *SplicedMemory) ReadMemory(buf []byte, addr uint64) (n int, err error) {\n\tstarted := false\n\tfor _, entry := range r.readers {\n\t\tif entry.offset+entry.length <= addr {\n\t\t\tif !started {\n\t\t\t\tcontinue\n\t\t\t}\n\t\t\treturn n, fmt.Errorf(\"hit unmapped area at %v after %v bytes\", addr, n)\n\t\t}\n\n\t\t// The reading of the memory has been started after the first iteration\n\t\tstarted = true\n\n\t\t// Don't go past the region.\n\t\tpb := buf\n\t\tif addr+uint64(len(buf)) > entry.offset+entry.length {\n\t\t\tpb = pb[:entry.offset+entry.length-addr]\n\t\t}\n\t\tpn, err := entry.reader.ReadMemory(pb, addr)\n\t\tn += pn\n\t\tif err != nil {\n\t\t\treturn n, fmt.Errorf(\"error while reading spliced memory at %#x: %v\", addr, err)\n\t\t}\n\t\tif pn != len(pb) {\n\t\t\treturn n, nil\n\t\t}","sourceCodeStart":92,"sourceCodeEnd":128,"githubUrl":"https://github.com/go-delve/delve/blob/a23773e6c31361e43246bc43a424ee009679b174/pkg/proc/core/core.go#L92-L128","documentation":"Error \"hit unmapped area at %v after %v bytes\" thrown in go-delve/delve.","triggerScenarios":"Thrown at pkg/proc/core/core.go:110 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"a23773e6c31361e43246bc43a424ee009679b174","analyzedAt":"2026-08-31T15:12:45.221Z","schemaVersion":2},"datasetVersion":"2026-08-31T19:17:28.585Z"}