[boost] [coroutine] x86 msvc11 stack corruption

Subject: [boost] [coroutine] x86 msvc11 stack corruption
From: Tobias Loew (Tobias.Loew_at_[hidden])
Date: 2014-01-16 09:27:10

Hi,

I use Boost 1.55 uni-directional coroutines to build an x86 MSVC11
application.

I have a simple pull-type (boost::coroutines::coroutine<void>::pull_type)
that under certain reproducable conditions destroys the stack after
returning from the coroutine.

Here is the corrupted stack as shown by VS2012
>	ebs2000.exe!CScriptMainFrame::DoRun(CPascalEditorDoc * 0x00000000, int
0x00000000, int 0x00000000) Line 3372	C++
         ebs2000.exe!CScriptMainFrame::OnDebugStepover() Line 4916	C++
         mfc110u.dll!_AfxDispatchCmdMsg(CCmdTarget *, unsigned int, int, void
(void) *, void *, unsigned int, AFX_CMDHANDLERINFO *)	C++
         00000002()	Unknown
         [Frames below may be incorrect and/or missing]	
         mfc110u.dll!CCmdTarget::OnCmdMsg(unsigned int, int 0x00000000, void *,
AFX_CMDHANDLERINFO *) Line 364	C++
         mfc110u.dll!CWnd::OnCommand(unsigned int 0x00018263, long 0x00000000) Line
2785	C++
         mfc110u.dll!CFrameWnd::OnCommand(unsigned int 0x00018263, long 0x00000000)
Line 389	C++
...

This only happens in windows x86 32-bit release-builds when the coroutine
finishes upon a user-action that also includes a windows WM_SETFOCUS message
on my menu-bar.

If at least one of the following is true, the stack-corruption does NOT
happen:

- debug-build

- x64 build

- using a different pull-type, e.g.
enum status_enum{...};
boost::coroutines::coroutine<status_enum>::pull_type

- not returning form the coroutine, but pushing just before the end of the
coroutine and swapping the pull-type-variable with a default constructed
"not-a-coroutine"

Even though I have a lot of workarounds, I still would like to know, why
this happens.

regards
Tobias

PS:

I had to recompile

ml /safeseh /c make_i386_ms_pe_masm.asm
ml /safeseh /c jump_i386_ms_pe_masm.asm

to get SAFESEH-libraries.

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