Debugger fails to stop on entry due to stack walk failure

[gregg-miskelly]

Repro steps:

1. Create hello world using dotnet new + dotnet restore + dotnet build
2. Try to debug it on OSX/Linux
   Result:
   There is a good chance that the debugger will fail to stop on entry point. libmscordbi.so!CordbThread::GetActiveFrame is returning CORDBG_E_READVIRTUAL_FAILURE.

I don't yet know if there is something special about entry point, or if this will happen in general. I had trouble debugging this with release bits, so I switched to debug. Using debug bits, I get an assert in the same method which is therefore probably the problem, but I can't say for certain. Here is the assert --

Assert failure(PID 17345 [0x000043c1], Thread: 17517 [0x446d]): memoryRange.Size() <= 0xffffffff
File: /home/greggm/coreclr/src/debug/daccess/dacdbiimpl.cpp Line: 4110

Here is memoryRange:

•   m_pStartAddress {...}   const PTR_VOID
  

•   base    {...}   __TPtrBase
  m_addr  0xffffffff  TADDR
  m_cbBytes   0x63722d312e302e00  const SIZE_T
  

Which comes from this loop:
for (int i = 0; i < Debugger::kMaxHijackFunctions; i++)
{
InitTargetBufferFromMemoryRange(pDebugger->m_rgHijackFunction[i], &m_pCachedHijackFunction[i] );

i is 2, which I believe is this hijack --
GetMemoryRangeForFunction(RedirectedHandledJITCaseForDbgThreadControl_Stub,
RedirectedHandledJITCaseForDbgThreadControl_StubEnd)

libmscordaccore.so!InitTargetBufferFromMemoryRange(const MemoryRange memoryRange, TargetBuffer * pTargetBuffer) Line 4110   C++
libmscordaccore.so!DacDbiInterfaceImpl::IsRuntimeUnwindableStub(DacDbiInterfaceImpl * this, PCODE targetControlPC) Line 4958    C++
libmscordaccore.so!DacDbiInterfaceImpl::GetStackWalkCurrentFrameInfo(DacDbiInterfaceImpl * this, IDacDbiInterface::StackWalkHandle pSFIHandle, DebuggerIPCE_STRData * pFrameData) Line 383  C++
libmscordaccore.so!non-virtual thunk to DacDbiInterfaceImpl::GetStackWalkCurrentFrameInfo(void**, DebuggerIPCE_STRData*)() Line 405 C++
libmscordbi.so!CordbStackWalk::GetFrameWorker(CordbStackWalk * this, ICorDebugFrame ** ppFrame) Line 582    C++
libmscordbi.so!CordbStackWalk::GetFrame(CordbStackWalk * this, ICorDebugFrame ** ppFrame) Line 523  C++
libmscordbi.so!non-virtual thunk to CordbStackWalk::GetFrame(ICorDebugFrame**)() Line 539   C++
libmscordbi.so!ShimStackWalk::Populate(ShimStackWalk * this) Line 229   C++
libmscordbi.so!ShimStackWalk::ShimStackWalk(ShimStackWalk * this, ShimProcess * pProcess, ICorDebugThread * pThread) Line 34    C++
libmscordbi.so!ShimProcess::LookupOrCreateShimStackWalk(ShimProcess * this, ICorDebugThread * pThread) Line 1636    C++
libmscordbi.so!CordbThread::GetActiveFrame(CordbThread * this, ICorDebugFrame ** ppFrame) Line 1089 C++
libmscordbi.so!non-virtual thunk to CordbThread::GetActiveFrame(ICorDebugFrame**)() Line 1107   C++
libvsdebugeng.impl.so!ManagedDM::CV2InstrBreakpoint::Fire(ManagedDM::CV2InstrBreakpoint * this, Microsoft::VisualStudio::Debugger::DkmThread * pDkmThread, ICorDebugThread * pCorThread) Line 237   C++
libvsdebugeng.impl.so!ManagedDM::CV2DbiCallback::DoBreakpoint(ManagedDM::CV2DbiCallback * this, ICorDebugAppDomain * pCorAppDomain, ICorDebugThread * pCorThread, ICorDebugBreakpoint * pCorBreakpoint) Line 1553   C++
libvsdebugeng.impl.so!ManagedDM::CDbiCallback::DoDebugEvents(ManagedDM::CDbiCallback * this, ATL::CAtlList<CComObjectPtr<ManagedDM::CManagedDebugEvent>, ATL::CElementTraits<CComObjectPtr<ManagedDM::CManagedDebugEvent> > > * pEvents) Line 2247  C++
libvsdebugeng.impl.so!ManagedDM::CV2DbiCallback::ProcessStoppingDebugEvents(ManagedDM::CV2DbiCallback * this) Line 1324 C++
libvsdebugeng.impl.so!ManagedDM::CV2DbiCallback::DoStoppingDebugEvents(ManagedDM::CV2DbiCallback * this) Line 1289  C++
libvsdebugeng.impl.so!ManagedDM::CV2EventThread::MessageLoop(ManagedDM::CV2EventThread * this, ManagedDM::CV2Process * pDMProcess) Line 269 C++
libvsdebugeng.impl.so!ManagedDM::CV2EventThread::ManagedDMEventThreadFunc(void * pvMessage) Line 218    C++
libvsbaseservices.so!CorUnix::CPalThread::ThreadEntry(void * pvParam) Line 1620 C++

[mikem8361]

PR dotnet/coreclr#4010