Re: Crash in 32-bit shell extension on Windows x64

On 24.06.2013 02:16, Francis Gagné wrote:
> Uh, I just realized that crshhndl.dll is a 64-bit DLL, and that it is
> loaded into a 32-bit process. That's not supposed to happen... unless
> TortoiseSVN uses some dark magic tricks I'm not aware of? In Process

That's not possible, not with any tricks, not at all.

> Hacker (http://processhacker.sourceforge.net/), I can see that
> crshhndl.dll is loaded as a "WOW64 DLL" (whereas some 64-bit system
> DLLs like ntdll.dll and wow64.dll are shown as "DLL").

I've attached a debugger to SonED2. While trying to open the file-open
dialog it throws exceptions. And it throws them a *lot*.
First-chance exception at 0x087E21D2 in SonED2.exe: 0xC0000005: Access
violation reading location 0x0000FF40.

As you can see, these are "first-chance exceptions", which usually are
not a problem. But in this number (while I'm writing this, the number of
exceptions exceeds 1 million(!!) and the file-open dialog isn't even
visible yet) and the fact that it's a 32-bit process on x64 OS indicates
that these are not normal first-chance exceptions but ones caught by the
WOW64 system and would cause a real exception on win32 OS.

My best guess: SonED2 has set its stack size smaller than normal, and
when the file-open dialog is shown a stack overflow happens because of
all the dlls that are loaded together with that file-open dialog.

Stefan

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