Issue description

Calling IDebugDocumentText::GetText with setting third parameter pstaTextAttr to NULL, it will return “The stub returns bad data”. Error code is 0x6f7 or 1783.

Troubleshooting

1. Capture TTD trace and analyze

     # Child-SP Return   Call Site                                                                                            Info
     0 22bfeb3c 761db925 RPCRT4!NdrpValidateCorrelatedValue+0x31c26
     1 (Inline) -------- RPCRT4!NdrCorrelationPass+0x22 
     2 22bfeb60 761c4cf6 RPCRT4!NdrpServerUnMarshal+0x865 
     3 22bfebc4 77073cd2 RPCRT4!NdrStubCall2+0x2a6 
     4 22bfeff4 761fe47a combase!CStdStubBuffer_Invoke+0x92
     5 22bff03c 77073aa2 RPCRT4!CStdStubBuffer_Invoke+0x2a
     6 (Inline) -------- combase!InvokeStubWithExceptionPolicyAndTracing::__l6::<lambda_ee1df801181086a03fa4f8f75bd5617f>::operator()+0x29
     7 22bff054 77073576 combase!ObjectMethodExceptionHandlingAction<<lambda_ee1df801181086a03fa4f8f75bd5617f> >+0x4e
     8 (Inline) -------- combase!InvokeStubWithExceptionPolicyAndTracing+0x13b
     9 22bff0a8 770f5921 combase!DefaultStubInvoke+0x2b6 
     a (Inline) -------- combase!SyncStubCall::Invoke+0x7 
     b (Inline) -------- combase!SyncServerCall::StubInvoke+0xa
     c (Inline) -------- combase!StubInvoke+0x2b8 
     d 22bff18c 7707b74a combase!ServerCall::ContextInvoke+0x471
     e (Inline) -------- combase!CServerChannel::ContextInvoke+0x126
     f (Inline) -------- combase!DefaultInvokeInApartment+0x126
    10 22bff3d8 770f81ad combase!ReentrantSTAInvokeInApartment+0x16a
    11 (Inline) -------- combase!AppInvoke+0x1020 
    12 22bff414 770abe62 combase!ComInvokeWithLockAndIPID+0x191d                                                              ClientPID: 0x658
    13 (Inline) -------- combase!ComInvoke+0x230 
    14 (Inline) -------- combase!ThreadDispatch+0x2cd 
    15 22bff69c 775d0fcb combase!ThreadWndProc+0x452 
    16 22bff734 775c7f9a USER32!_InternalCallWinProc+0x2b 
    17 (Inline) -------- USER32!InternalCallWinProc+0x1b 
    18 22bff760 775c5cfa USER32!UserCallWinProcCheckWow+0x33a
    19 22bff844 775c5ac0 USER32!DispatchMessageWorker+0x22a
    1a 22bff8b8 771124fd USER32!DispatchMessageW+0x10 
    1b (Inline) -------- combase!CCliModalLoop::MyDispatchMessage+0xa
    1c 22bff8c4 77112594 combase!CCliModalLoop::PeekRPCAndDDEMessage+0x4d
    1d 22bff8f8 77112239 combase!CCliModalLoop::FindMessage+0x37
    1e 22bff92c 770adee8 combase!CCliModalLoop::HandleWakeForMsg+0x4c
    1f 22bff990 7707bb84 combase!CCliModalLoop::BlockFn+0x21e
    20 22bff9fc 7707b5b7 combase!ClassicSTAThreadWaitForHandles+0xb4
    21 22bffab8 22d28aec combase!CoWaitForMultipleHandles+0x77
    22 22bffae4 22d28cbc pdm!CDebuggerThread::CallableWaitForMultiple+0x72
    23 22bffb94 22d28c5b pdm!CDebuggerThread::ThreadEntry+0x60
    24 22bffbb8 7603fa29 pdm!DebuggerThreadEntry+0xb 
    25 22bffbc0 77d67a7e KERNEL32!BaseThreadInitThunk+0x19
    26 22bffbd0 77d67a4e ntdll!__RtlUserThreadStart+0x2f 
    27 22bffc2c 00000000 ntdll!_RtlUserThreadStart+0x1b 
    0:100> g
    (658.1fec): Unknown exception - code 000006f7 (first/second chance not available)
    (658.1fec): Unknown exception - code 000006f7 (first/second chance not available)
    (658.2cd0): Unknown exception - code 800706f7 (first/second chance not available)
    (658.1fec): Unknown exception - code 000006f7 (first/second chance not available)
    (658.1fec): Unknown exception - code 000006f7 (first/second chance not available)
    (658.2cd0): Unknown exception - code 800706f7 (first/second chance not available)
   

2. After checking the issue is caused by new feature of “correlation consistency checking” in RPC module.

Cause

Bug in RPC module.

We can easily reproduce the issue with sample in Introduction to RPC - Part 1 by modifying below code:

1. Add “,size_is(10),ptr” in Example1.idl

2. Replace Output(“Hello Implicit RPC World!”) with Output(NULL)

3. Rebuild the sample, Then Run Example1Server.exe and Example1Client.exe in two different CMD

4. We will get below error:

   Hex	Dec	Symbolic Name	Error Description	Header
   0x6f7	1783	RPC_X_BAD_STUB_DATA	The stub received bad data.	winerror.h

Soltuion

Use non-Null value for pstaTextAttr