{"record":{"id":"cf1e99599f590229","repo":"go-delve/delve","slug":"qmemoryregioninfo-error-s","errorCode":null,"errorMessage":"qMemoryRegionInfo error: %s","messagePattern":"qMemoryRegionInfo error: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/proc/gdbserial/gdbserver_conn.go","lineNumber":1311,"sourceCode":"\t\t\tsize, err := strconv.ParseUint(string(value), 16, 64)\n\t\t\tif err != nil {\n\t\t\t\treturn nil, fmt.Errorf(\"malformed qMemoryRegionInfo response packet (size): %v in %s\", err, string(resp))\n\t\t\t}\n\t\t\tmri.size = size\n\t\tcase \"permissions\":\n\t\t\tmri.permissions = string(value)\n\t\tcase \"name\":\n\t\t\tnamestr, ok := decodeHexString(value)\n\t\t\tif !ok {\n\t\t\t\treturn nil, fmt.Errorf(\"malformed qMemoryRegionInfo response packet (name): %s\", string(resp))\n\t\t\t}\n\t\t\tmri.name = namestr\n\t\tcase \"error\":\n\t\t\terrstr, ok := decodeHexString(value)\n\t\t\tif !ok {\n\t\t\t\treturn nil, fmt.Errorf(\"malformed qMemoryRegionInfo response packet (error): %s\", string(resp))\n\t\t\t}\n\t\t\treturn nil, fmt.Errorf(\"qMemoryRegionInfo error: %s\", errstr)\n\t\t}\n\t}\n\n\treturn mri, nil\n}\n\n// exec executes a message to the stub and reads a response.\n// The details of the wire protocol are described here:\n//\n//\thttps://sourceware.org/gdb/onlinedocs/gdb/Overview.html#Overview\nfunc (conn *gdbConn) exec(cmd []byte, context string) ([]byte, error) {\n\tif err := conn.send(cmd); err != nil {\n\t\treturn nil, err\n\t}\n\treturn conn.recv(cmd, context, false)\n}\n\nconst hexdigit = \"0123456789abcdef\"","sourceCodeStart":1293,"sourceCodeEnd":1329,"githubUrl":"https://github.com/go-delve/delve/blob/a23773e6c31361e43246bc43a424ee009679b174/pkg/proc/gdbserial/gdbserver_conn.go#L1293-L1329","documentation":"This error surfaces when the remote stub explicitly reports a failure for the qMemoryRegionInfo query by including an 'error:<hex-encoded text>' key in its response. Unlike the malformed-packet errors, the packet is well-formed; the target itself rejected the query. Delve decodes the hex error text and propagates it to the caller.","triggerScenarios":"Any memory-region-info query via the gdbserial backend where the stub responds with an error key — typically because the queried address is outside any known mapping, or qMemoryRegionInfo is unsupported/unimplemented by the stub.","commonSituations":"Querying addresses not in the target's memory map, connecting to stubs that advertise partial RSP support (e.g. some OpenOCD/embedded monitors), stripped-down gdbserver implementations lacking qMemoryRegionInfo.","solutions":["Read the decoded error text in the message — it states the stub-specific reason","Verify the address being queried belongs to a valid mapping in the target process","Check stub support for qMemoryRegionInfo (e.g. gdbserver monitor commands) and upgrade it if missing","Handle the failure gracefully in the caller (e.g. skip region-dependent features) if the stub will never support it"],"exampleFix":"// before: query arbitrary address and crash on error\nmri, err := conn.memoryRegionInfo(addr)\n// after: treat unsupported stubs as non-fatal\nmri, err := conn.memoryRegionInfo(addr)\nif err != nil {\n    log.Printf(\"region info unavailable: %v\", err)\n    return defaultRegion\n}","handlingStrategy":"fallback","validationCode":null,"typeGuard":"func isRegionInfoUnsupported(err error) bool {\n    var target *targetErr\n    if errors.As(err, &target) && strings.Contains(target.Error(), \"qMemoryRegionInfo error:\") {\n        return true\n    }\n    return strings.Contains(err.Error(), \"qMemoryRegionInfo error:\")\n}","tryCatchPattern":"mri, err := conn.memoryRegionInfo(addr)\nif err != nil {\n    var msg string\n    if strings.HasPrefix(err.Error(), \"qMemoryRegionInfo error:\") {\n        msg = strings.TrimPrefix(err.Error(), \"qMemoryRegionInfo error: \")\n        log.Printf(\"target rejected region query: %s\", msg)\n        return fallbackRegionInfo(addr) // e.g. /proc/self/maps or conservative default\n    }\n    return err\n}","preventionTips":["Query only addresses known to be mapped (e.g. from module/segment lists)","Detect stub qMemoryRegionInfo support once at startup and cache the result","Provide a fallback source of memory map info (procfs, linker-provided segments)","Keep the stub updated; error responses for valid queries often indicate missing stub features"],"tags":["gdbserial","protocol","remote-error"],"backgroundTag":"malformed-remote-protocol-response","analyzedSha":"a23773e6c31361e43246bc43a424ee009679b174","analyzedAt":"2026-08-31T15:12:45.221Z","schemaVersion":2},"datasetVersion":"2026-08-31T19:17:28.585Z"}