ACCESS_VIOLATION

WINDBG
1

I am running into this problem, where my driver
crashes during bootup. It throws out a 0x7E, with
ACCESS_VIOLATION.

I look at KB and it shows me that it is crashing at
the first line of one of my functions.

The code is written in C++ and the call is a Native
C++ call. Hence the ECX is supposed to have the
pointer to “this” object. But I see that the ECX value
is “0”.

the first line in my func is like

member_of_this.a = 0;

and when I look at the disassembly of this it is
like

mov eax DWORD PTR[ecx+0x1890] and ECX is ZERO.

However if I look at the cod files and lookup the
disaaembly of my func the first line is

mov eax DWORD PTR[ecx+6288]

Is someone stomping on the stack? Any clues what is
happening?

Appreciate any help.
Thanks.

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2

> mov eax DWORD PTR[ecx+0x1890] and ECX is ZERO.
> However if I look at the cod files and lookup the
> disaaembly of my func the first line is
> mov eax DWORD PTR[ecx+6288]

0x1890 == 6288 decimal.

Nobody is stomping on your stack. It’s just a bug in your driver.

Cheers,
Felix.

3

May be you are calling your objects method simply via a null pointer.

mov eax DWORD PTR[ecx+0x1890] and ECX is ZERO.

It seems to be an huge object?!

Volker.

-----Original Message-----
From: Venkat Yellepeddy [mailto:xxxxx@yahoo.com]
Sent: Monday, June 16, 2003 6:39 PM
To: Kernel Debugging Interest List
Subject: [windbg] ACCESS_VIOLATION

I am running into this problem, where my driver
crashes during bootup. It throws out a 0x7E, with
ACCESS_VIOLATION.

I look at KB and it shows me that it is crashing at
the first line of one of my functions.

The code is written in C++ and the call is a Native
C++ call. Hence the ECX is supposed to have the
pointer to “this” object. But I see that the ECX value
is “0”.

the first line in my func is like

member_of_this.a = 0;

and when I look at the disassembly of this it is
like

mov eax DWORD PTR[ecx+0x1890] and ECX is ZERO.

However if I look at the cod files and lookup the
disaaembly of my func the first line is

mov eax DWORD PTR[ecx+6288]

Is someone stomping on the stack? Any clues what is
happening?

Appreciate any help.
Thanks.

Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com

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