exception 10h

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.

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.

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

Quote:

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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.

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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 ???

Quote:

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

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

Quote:

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

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

Quote:

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Lrun32 caused an exception 10h in module SWFLASH.OCX

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

Quote:

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

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PSS ID Number: 257630

Quote:

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

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PSS ID Number: 287719

Quote:

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

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PSS ID Number: 264804

Quote:

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

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

Quote:

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What do your quotes about the coprozessor mean ???

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

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

• Finding crash information using the MAP file

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.

Quote:

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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...

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 !