exception 10h

[Ralf Schneider]

Hi,
Several users complain it crashed immediately on their machines
including windows 95, 95 OSR2, 98.
It says somthing like:
MyProg cause an exception 10H in module MyProg.exe at
0137: 0040e864
Registers:
....
Stack dump:
...


I tested the software on my company's windows 95, OSR2, 98, xp machines and it works
fine. I just can not reproduce those crashes, and they are too far away for me to be on site.
Anyone has a clue on how to debug this problem?
I appreciared your input.

I used c++ 6.0 for compile.

[vicodin451]

Use a map file to determine what code is at 0040e864? If your process is loading at 0x00400000, seems like it's in your EXE. So you should be able to track it down to the exact line of code using a map file, so long as the source you build the map file from is identical to the source that was used to build the program that is on site.

[vicodin451]

Oh... 10h, from MSKB 150314 - "What Are Fatal Exception Errors":

16 (10h): Coprocessor Error Fault
This interrupt occurs when an unmasked floating-point exception has signaled a previous instruction. (Because the 80386 does not have access to the Floating Point unit, it checks the ERROR\ pin to test for this condition.) This is also triggered by a WAIT instruction if the Emulate Math Coprocessor bit at CR0 is set.

[Ralf Schneider]

I used "crashfinder" to detect the position in the code. And the position is not in my code !!!!

What do your quotes about the coprozessor mean ???

[vicodin451]

Originally posted by Ralf Schneider
I used "crashfinder" to detect the position in the code. And the position is not in my code !!!!

Where is the crash, then?
And what's with

MyProg cause an exception 10H in module MyProg.exe at

That points to MyProg.exe...
Other similar messages in the KB are:
PSS ID Number: 315215

Lrun32 caused an exception 10h in module SWFLASH.OCX

That points to the OCX which contained the code that caused the exception.
PSS ID Number: 273860

Winproj caused an exception 10H in module WINPROJ.EXE at address

PSS ID Number: 257630

PROJECT1 caused an exception 10H in module MSVBVM60.DLL at 015f:66024d53

PSS ID Number: 287719

Wmplayer caused an exception 10H in module Wmvcore.dll at 017f:739253c6

PSS ID Number: 264804

FRONTPG caused an exception 10H in module FPEDITAX.DLL at

In each case, the faulting module is identified by Windows... In your case, it would seem that MyProg.exe is causing the problem.

What do your quotes about the coprozessor mean ???

According to MSDN, that's what exception 10h is.

I'm guessing that your users get a blue screen with the information you posted?

[Andreas Masur]

• Finding crash information using the MAP file

[Ralf Schneider]

I guess, the problem will caused by a referenced but uninitialized float-variable.
I will send the new file to the user to test it.

[vicodin451]

Originally posted by Ralf Schneider
I guess, the problem will caused by a referenced but uninitialized float-variable.
I will send the new file to the user to test it.

Post back with the results...

[Ralf Schneider]

that's it !
There was an uninitialized float-variable used in a cast operation:

float f;
WORD w=(WORD)f;

I think, the exception will occur on these PCs in any situation an uninitialized float-variable is used !