[pywin32-bugs] [ pywin32-Bugs-1442426 ] Crash on startup with Windows 2003 and AMD X2 dual core

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Bugs item #1442426, was opened at 2006-03-03 13:07
Message generated for change (Comment added) made by kxroberto
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Category: pythonwin
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Luke Plant (lukeplant)
Assigned to: Nobody/Anonymous (nobody)
Summary: Crash on startup with Windows 2003 and AMD X2 dual core 

Initial Comment:
I have installed Python 2.4 and Pythonwin build 207 on
a brand new Windows Server 2003 system.  When I run
pythonwin, it crashes after drawing the mainwindow and
part way through drawing the interactive window. I get
the following error message:

> The instruction at "0x00affa6c" referenced memory at 
> "0x00affa6c".  The memory could not be "written"

I have installed exactly the same version of pythonwin
on an almost identical system, but with different
hardware, so I suspect it is something to do with the
processor on this one.  The processor is an "AMD 64 X2
Dual Core 4400+".

Visual Studio attempts to debug it, but of course there
isn't any source code.  In the disassembly listing, the
following line is highlighted:

00AFFA6C  pop         eax 

I can give more than this if required, but I don't know
whether it would be useful (or how much to include).

Thanks.

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Comment By: Robert Kiendl (kxroberto)
Date: 2006-03-08 16:38

Message:
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A serious issue. As more and more dual core CPUs are on the
end user market I got reports of similar crashes in win32ui
apps: See the dual core bugs posted as bug# 1441884 (by
mismatch?) in the Python project.
http://sourceforge.net/tracker/index.php?func=detail&aid=1441884&group_id=5470&atid=105470
The dual core problems seems more to be in Pythonwin, as
there are all those indications to MFC dll's.

This problem is different from the crash-bugs 1048355
(unresolved in the normal build since long time; but users
with the patch also have the dual core problem) and 1445659
(new bug in 206 & 207).

Robert


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Comment By: Luke Plant (lukeplant)
Date: 2006-03-03 15:19

Message:
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I've discovered that it is related to 'DEP' (Data Execution
Prevention) which is available with some AMD processors. 
You can disable this on a per-process basis in Windows - go
to Control Panel -> System -> 'Advanced' tab -> Performance
'Settings' -> 'DEP' tab

It's still a bug in pythonwin though.

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You can respond by visiting: 
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