Debug attaching to a running application with lldb on macOS fails

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dStart parameters: 'Process 76962' mode: 3
dABI: x86-darwin-generic-mach_o-64bit
dLanguages: c++ 
dExecutable: sleep 
dDebugger: /usr/bin/lldb
dPID: 76962 
dSysroot: 
dDebug Source Location: 
dDebugger settings:
dAdditionalArguments:   (default: )
dAdjustBreakpointLocations: true  (default: true)
dAllPluginBreakpoints: true  (default: true)
dAlwaysAdjustColumnWidths: true  (default: true)
dAutoDerefPointers: true  (default: true)
dAutoEnrichParameters: true  (default: true)
dAutoQuit: false  (default: false)
dBreakEvent:   (default: )
dBreakOnAbort: false  (default: false)
dBreakOnCatch: false  (default: false)
dBreakOnCrtDbgReport: false  (default: false)
dBreakOnFatal: false  (default: false)
dBreakOnThrow: false  (default: false)
dBreakOnWarning: false  (default: false)
dBreakpointCorrection: true  (default: true)
dBreakpointsFullPath: false  (default: false)
dCDB_Console: false  (default: false)
dCloseBuffersOnExit: false  (default: false)
dCloseMemoryBuffersOnExit: true  (default: true)
dDisplayStringLimit: 1000  (default: 100)  ***
dEnableReverseDebugging: false  (default: false)
dExtraDumperFile:   (default: )
dFirstChanceExceptionTaskEntry: true  (default: true)
dFontSizeFollowsEditor: false  (default: false)
dGdbCustomDumperCommands:   (default: )
dGdbPostAttachCommands:   (default: )
dGdbStartupCommands: #settings set target.source-map /private/tmp/python-20160802-64718-dxvcid/Python-2.7.11 /Users/alex/Dev/python2_debug/Python-2.7.11
d#settings set target.source-map /Users/qt/work/qt /Users/alex/Dev/qt/qt58_source
d#script import pydevd
d#script pydevd.settrace('localhost', port=13337, stdoutToServer=True, stderrToServer=True)
d  (default: )  ***
dIdentifyDebugInfoPackages: false  (default: false)
dIgnoreFirstChanceAccessViolation: false  (default: false)
dIntelFlavor: false  (default: false)
dLoadGdbDumpers2: false  (default: false)
dLoadGdbInit: true  (default: true)
dLogTimeStamps: false  (default: false)
dMaximalStackDepth: 40  (default: 20)  ***
dMaximalStringLength: 10000  (default: 10000)
dMultiInferior: false  (default: false)
dNoPluginBreakpoints: false  (default: false)
dQmlInspector.ShowAppOnTop: false  (default: false)
dRaiseOnInterrupt: true  (default: true)
dSecondChanceExceptionTaskEntry: true  (default: true)
dSelectedPluginBreakpoints: false  (default: false)
dSelectedPluginBreakpointsPattern: .*  (default: .*)
dShowQObjectNames2: true  (default: true)
dShowQmlObjectTree: true  (default: true)
dShowQtNamespace: true  (default: true)
dShowStandardNamespace: true  (default: true)
dShowThreadNames: false  (default: false)
dSkipKnownFrames: false  (default: false)
dSortStructMembers: false  (default: true)  ***
dSourcePaths:   (default: )
dStationaryEditorWhileStepping: false  (default: false)
dSwitchModeOnExit: false  (default: false)
dSymbolPaths:   (default: )
dTargetAsync: true  (default: false)  ***
dUseAddressInBreakpointsView: false  (default: false)
dUseAddressInStackView: false  (default: false)
dUseAlternatingRowColours: false  (default: false)
dUseCodeModel: true  (default: true)
dUseDebuggingHelper: true  (default: true)
dUseDynamicType: true  (default: true)
dUseMessageBoxForSignals: true  (default: true)
dUsePythonDumper: true  (default: true)
dUseToolTips: false  (default: true)  ***
dUseToolTipsInBreakpointsView: true  (default: false)  ***
dUseToolTipsInLocalsView: false  (default: false)
dUseToolTipsInStackView: true  (default: true)
dWarnOnReleaseBuilds: true  (default: true)
dWatchdogTimeout: 20  (default: 20)
dState changed from DebuggerNotReady(0) to EngineSetupRequested(1)
dCALL: SETUP ENGINE
dSTARTING LLDB: /usr/bin/lldb
>@
>lldbversion="lldb-1001.0.13.3
>  Swift-5.0"@
>@
>state="enginesetupok"@
 Setting up inferior...
<1loadDumpers({"token":1})
<2setupInferior({"attachpid":76962,"breakonmain":0,<environment suppressed>,"executable":"sleep","nativemixed":0,"platform":"","processargs":"","remotechannel":"","startmode":3,"sysroot":"","token":2,"useterminal":0,"workingdirectory":""})
dNOTE: ENGINE SETUP OK
dState changed from EngineSetupRequested(1) to EngineSetupOk(3)
dState changed from EngineSetupOk(3) to EngineRunRequested(4)
dCALL: RUN ENGINE
 Running requested...
<3runEngine({"token":3})
>(lldb) script sys.path.insert(1, '/Volumes/T3/Dev/qtcreator/officia_4100rc1_opensource/Qt Creator.app/Contents/Resources/debugger/')
>(lldb) script from lldbbridge import *
>(lldb) #settings set target.source-map /private/tmp/python-20160802-64718-dxvcid/Python-2.7.11 /Users/alex/Dev/python2_debug/Python-2.7.11
>(lldb) #settings set target.source-map /Users/qt/work/qt /Users/alex/Dev/qt/qt58_source
>(lldb) #script import pydevd
>(lldb) #script pydevd.settrace('localhost', port=13337, stdoutToServer=True, stderrToServer=True)
>(lldb) script theDumper.loadDumpers({"token":1})
>@
>result={token="1",dumpers=[{type="std____debug__unordered_set"},{type="boost__variant"},{type="QV4__InternalClass__Transition"},{type="QSizePolicy"},{type="QtcDumperTest_PointerArray"},{type="std__list"},{type="QmakeProjectManager__QmakeProFileNode"},{type="QtcDumperTest_FieldAccessByIndex"},{type="std__multimap",formats="17"},{type="QUuid"},{type="boost__optional"},{type="QDir"},{type="TNimNode"},{type="QSharedData"},{type="Debugger__Internal__GdbMi"},{type="QV4__PropertyHash"},{type="std__complex"},{type="__m256"},{type="boost__container__list"},{type="CPlusPlus__Symbol"},{type="std____debug__unordered_multimap",formats="17"},{type="std____1__complex"},{type="std__deque"},{type="std___Rb_tree_const_iterator"},{type="QFixed"},{type="uint8_t"},{type="std____1__set__iterator"},{type="std____debug__stack"},{type="CPlusPlus__StringLiteral"},{type="QPoint"},{type="std__unordered_multimap",formats="17"},{type="std____1__vector",formats="16"},{type="QMultiMap",formats="17"},{type="PyTypeObject"},{type="std__byte"},{type="QLocale"},{type="QV4__CallContext"},{type="QJsonPrivate__q_littleendian"},{type="string",editable="true"},{type="std__set"},{type="std___Tree_const_iterator"},{type="__gnu_cxx__hash_set"},{type="QFile"},{type="wstring",editable="true"},{type="QByteArrayData"},{type="CPlusPlus__Literal"},{type="QSizeF"},{type="CPlusPlus__Class"},{type="NimStringDesc"},{type="QRegion"},{type="QIPv6Address"},{type="QV4__Heap__String"},{type="Utils__ElfSection"},{type="QGraphicsPolygonItem"},{type="Debugger__Internal__DisassemblerLine"},{type="QTypedArrayData"},{type="QPointer"},{type="QMap",formats="17"},{type="std____cxx11__string",editable="true",formats="5, 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4"},{type="QV4_Object"},{type="QBasicAtomicInt"},{type="QScriptValue"},{type="QMetaProperty"},{type="QDateTime"},{type="std____1__unordered_set"},{type="std____1__map__iterator"},{type="boost__gregorian__date"},{type="CPlusPlus__Token"},{type="std__pair"},{type="std__set__QNX"},{type="std____1__list"},{type="std__deque__MSVC"},{type="CPlusPlus__ByteArrayRef"},{type="QProcEnvKey"},{type="boost__shared_ptr"},{type="QV__PropertyHash"},{type="Core__Id"},{type="std__basic_string"},{type="std____debug__vector",formats="16"},{type="QRectF"},{type="QAtomicInt"},{type="__m256i"},{type="QQmlSourceLocation"},{type="QKeyEvent"},{type="__m256d"},{type="KDSoapValue"},{type="std____1__set"},{type="PyVarObject"},{type="gsl__byte"},{type="QPolygonF"},{type="QXmlStreamAttribute"},{type="int8_t"},{type="QStandardItemData"},{type="QV4__SharedInternalClassData"},{type="QQmlAccessorProperties__Properties"},{type="QHashedString"},{type="QtcDumperTest_String"},{type="QV4__ExecutionContext"},{type="ProKey"},{type="WTF__String"},{type="std__vector",editable="true",formats="16"},{type="QV4__FunctionObject"},{type="PyObject"},{type="std____1__multiset"},{type="std____1__unordered_map",formats="17"},{type="QV4__IdentifierTable"},{type="__m512i"},{type="QV4__InternalClassTransition"},{type="__m128i"},{type="QVariantMap",formats="17"},{type="QStringRef"},{type="std____debug__map"},{type="std____debug__list"},{type="QStaticStringData"},{type="QVariant (QVariantMap)",formats="17"},{type="QSize"},{type="Debugger__Internal__WatchItem"},{type="QPolygon"},{type="std____1__string"},{type="QSharedDataPointer"},{type="QV__PropertyHashData"},{type="QStringList"},{type="std___Rb_tree_iterator"},{type="QString",editable="true",formats="2, 4"},{type="std__optional"},{type="std__deque__QNX"},{type="CPlusPlus__Identifier"},{type="QRegExp"},{type="QTextCursor"},{type="QFlags"},{type="QStringData"},{type="std____debug__unordered_map",formats="17"},{type="QList",formats="18, 19"},{type="QJsonPrivate__qle_signedbitfield"},{type="QSharedPointer"},{type="QUrl",formats="2, 4"},{type="QmakeProjectManager__QmakePriFileNode"},{type="cv__Mat",formats="4"},{type="QVarLengthArray"},{type="QV4__Object"},{type="std____debug__deque"},{type="std__unique_ptr"},{type="QScopedPointer"},{type="__m512"},{type="std____1__map",formats="17"},{type="QStandardItem"},{type="QtcDumperTest_BufArray"},{type="QMapNode"},{type="Core__GeneratedFile"},{type="QObjectConnectionList"},{type="std____1__array",formats="16"},{type="std____1__valarray",formats="16"},{type="QVariant"},{type="QV4__String"},{type="QVector",editable="true",formats="16"},{type="ProjectExplorer__ProjectNode"},{type="CPlusPlus__Internal__PPToken"},{type="Debugger__Internal__ThreadId"},{type="std____1__once_flag"},{type="QHashNode",formats="17"},{type="QV4__Scoped"},{type="ProString"},{type="_typeobject"},{type="Utils__Port"},{type="QV4__CompilationUnit"},{type="std__experimental__optional"},{type="QTemporaryFile"},{type="QXmlAttributes__Attribute"},{type="std__function"},{type="QJsonObject"},{type="QRect"},{type="CPlusPlus__IntegerType"},{type="std__array",formats="16"},{type="CMakeProjectManager__Internal__CMakeProjectNode"},{type="QJSValue"},{type="std____cxx11__list"},{type="CPlusPlus__FullySpecifiedType"},{type="__gnu_debug___Safe_iterator"},{type="QV4__ScriptFunction"},{type="QSizePolicy__Policy"},{type="QtcDumperTest_List"},{type="QWeakPointer"},{type="std__weak_ptr"},{type="QMetaMethod"},{type="QAtomicPointer"},{type="CPlusPlus__NamedType"},],python="20710"}@
>(lldb) script theDumper.setupInferior({"attachpid":76962,"breakonmain":0,"environment":[],"executable":"sleep","nativemixed":0,"platform":"","processargs":"","remotechannel":"","startmode":3,"sysroot":"","token":2,"useterminal":0,"workingdirectory":""})
>@
>result={token="2",success="1",msg="success",exe="sleep"}@
>(lldb) script theDumper.runEngine({"token":3})
>1^
>2^

>@
>pid="76962"@
>@
>state="enginerunandinferiorstopok"@
dNOTE: ENGINE RUN AND INFERIOR STOP OK
 Stopped.
dState changed from EngineRunRequested(4) to InferiorStopOk(11)
dNOTE: INFERIOR RUN REQUESTED
 Run requested...
dState changed from InferiorStopOk(11) to InferiorRunRequested(7)
<4continueInferior({"token":4})
>(lldb) script theDumper.continueInferior({"token":4})
>@
>result={token="4",success="1",error={type="0",code="0",desc="success"}}@
>@
>event={type="1",data="0x7ff2a4a006c0 Event: broadcaster = 0x7ff2a5008a38 (lldb.process), type = 0x00000001 (state-changed), data = { process = 0x7ff2a5008a00 (pid = 76962), state = running}",msg="None",flavor="Process::ProcessEventData",state="running",bp="No value"}@
>@
>state="running"@
>@
>event={type="1",data="0x7ff2a4a01510 Event: broadcaster = 0x7ff2a5008a38 (lldb.process), type = 0x00000001 (state-changed), data = { process = 0x7ff2a5008a00 (pid = 76962), state = exited}",msg="None",flavor="Process::ProcessEventData",state="exited",bp="No value"}@
>@
>state="inferiorexited"@
>@
>exited={status="0",desc="None"}@
>4^
dNOTE: INFERIOR RUN OK
 Running.
dState changed from InferiorRunRequested(7) to InferiorRunOk(8)
dNOTE: INFERIOR EXITED
dState changed from InferiorRunOk(8) to InferiorShutdownFinished(14)
dState changed from InferiorShutdownFinished(14) to EngineShutdownRequested(15)
dCALL: SHUTDOWN ENGINE
dLLDB PROCESS ERROR: 1
dNOTE: ENGINE SHUTDOWN FINISHED
dState changed from EngineShutdownRequested(15) to EngineShutdownFinished(16)
 Debugger finished.
dState changed from EngineShutdownFinished(16) to DebuggerFinished(17)