https://issues.dlang.org/show_bug.cgi?id=13105

          Issue ID: 13105
           Summary: Stack overflow in Fibers running druntime unittests
           Product: D
           Version: unspecified
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: major
          Priority: P1
         Component: druntime
          Assignee: nobody@puremagic.com
          Reporter: r.sagitario@gmx.de

When I build github master and run the druntime unittests for Win32, I get a stack overflow when an exception is thrown from within a fiber. thread.d, line 4719:

unittest
{
    enum MSG = "Test message.";

    try
    {
        (new Fiber({
            throw new Exception( MSG );
        })).call();
        assert( false, "Expected rethrown exception." );
    }
    catch( Throwable t )
    {
        assert( t.msg == MSG );
    }
}

It crashes with this stack:
     KernelBase.dll!_LoadLibraryExW@12()  + 0xc6 bytes
     kernel32.dll!_LoadLibraryW@4()  + 0x12 bytes
     dbghelp.dll!LoadDLL()  + 0xe9 bytes
     dbghelp.dll!symsrvLoadLib()  + 0x43 bytes
     dbghelp.dll!AddPath()  + 0x78 bytes
     dbghelp.dll!symsrvTest()  + 0x4e bytes
     dbghelp.dll!diaLocatePdb()  + 0x508 bytes
     dbghelp.dll!diaGetPdb()  + 0x1b7 bytes
     dbghelp.dll!GetDebugData()  + 0x23b bytes
     dbghelp.dll!modload()  + 0x287 bytes
     dbghelp.dll!LoadSymbols()  + 0x352 bytes
     dbghelp.dll!FindModule()  + 0x1ab bytes
     dbghelp.dll!_SymFunctionTableAccess64AccessRoutines@20()  + 0x71 bytes
     dbghelp.dll!_SymFunctionTableAccess64@12()  + 0x17 bytes
     dbghelp.dll!FunctionTableAccessRoutineLocal()  + 0x13 bytes
     dbghelp.dll!DbhStackServices::GetFunctionEntry()  + 0x23 bytes
     dbghelp.dll!DbsX86StackUnwinder::SearchForReturnAddress()  + 0x3f0 bytes
     dbghelp.dll!DbsX86StackUnwinder::FrameInfoUnwind()  + 0x3ec bytes
     dbghelp.dll!DbsX86StackUnwinder::Unwind()  + 0x161 bytes
     dbghelp.dll!DbsStackUnwinder::DbhUnwind()  + 0xcd bytes
     dbghelp.dll!PickX86Walk()  + 0x153 bytes
     dbghelp.dll!_StackWalkEx@40()  + 0x32e bytes
     dbghelp.dll!_StackWalk64@36()  + 0x89 bytes

unittest.exe!_D4core3sys7windows10stacktrace10StackTrace11traceNoSyncFkPS4core3sys7windows7windows7CONTEXTZAm()
 + 0x298 bytes
     unittest.exe!_D4core3sys7windows10stacktre10Sင???()  + 0x2c bytes
     unittest.exe!_D4core6thread18__unittestL4719_95FZ9__lambda1FNaNfZv()  +
0x39 bytes

I guess it would not happen if it won't be the first stracktrace generated which has to load additional DLLs.


I also get a stack overflow with the fiber unittests for Win64 if I create a druntime debug build and a collection runs from within the fiber. The recursive calls for GC scanning are too deep then (50).

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