!vtop Error: Page Directory Entry 1028 Not Valid...

WINDBG
1

ALL:

Does anyone know what “PageDirectory Entry 1028 not valid, try another
process” means when returned from !vtop? It seems to matter neither
what process is used nor, what virtual address. Is the just a different
manifestation of whatever was/is causing !vtop/!ptov to throw an
exception?

Thanks,

MM

2

It means the page directory entry does not have the valid bit set. What
arguments are you using? What exactly is the output you get? If you
see a zero pdi and pti you are probably missing the virtual address
argument. Also, the parser cannot handle expressions.

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Martin O’Brien
Sent: Monday, August 28, 2006 6:08 AM
To: Kernel Debugging Interest List
Subject: [windbg] !vtop Error: Page Directory Entry 1028 Not Valid…

ALL:

Does anyone know what “PageDirectory Entry 1028 not valid, try another
process” means when returned from !vtop? It seems to matter neither
what process is used nor, what virtual address. Is the just a different
manifestation of whatever was/is causing !vtop/!ptov to throw an
exception?

Thanks,

MM

You are currently subscribed to windbg as: xxxxx@winse.microsoft.com To
unsubscribe send a blank email to xxxxx@lists.osr.com

3

PETER:

Thanks for your reply. I’m sorry I didn’t include more information; it
was late. Unfortunately, I don’t recall what I entered at this point,
but I do remember that neither the PDI nor PDI were zero. As I was
getting this error with pretty much any address, I’m guessing that I was
using some sort of expression.

By the way, what was the deal with !vtop/!ptov throwing exceptions? I
still get those not uncommonly. Might these also be do my using
expressions?

Thanks,

MM

>> xxxxx@winse.microsoft.com 2006-08-28 23:41 >>>
It means the page directory entry does not have the valid bit set.
What
arguments are you using? What exactly is the output you get? If you
see a zero pdi and pti you are probably missing the virtual address
argument. Also, the parser cannot handle expressions.

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Martin O’Brien
Sent: Monday, August 28, 2006 6:08 AM
To: Kernel Debugging Interest List
Subject: [windbg] !vtop Error: Page Directory Entry 1028 Not Valid…

ALL:

Does anyone know what “PageDirectory Entry 1028 not valid, try another
process” means when returned from !vtop? It seems to matter neither
what process is used nor, what virtual address. Is the just a
different
manifestation of whatever was/is causing !vtop/!ptov to throw an
exception?

Thanks,

MM

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4

It’s hard to say why the exceptions are being thrown without looking at
a specific case. I believe there have been bug fixes in these
extensions also.

I’d try with a very simple case to see if you can get anything to work.

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Martin O’Brien
Sent: Wednesday, August 30, 2006 1:51 AM
To: Kernel Debugging Interest List
Subject: RE: [windbg] !vtop Error: Page Directory Entry 1028 Not
Valid…

PETER:

Thanks for your reply. I’m sorry I didn’t include more information; it
was late. Unfortunately, I don’t recall what I entered at this point,
but I do remember that neither the PDI nor PDI were zero. As I was
getting this error with pretty much any address, I’m guessing that I was
using some sort of expression.

By the way, what was the deal with !vtop/!ptov throwing exceptions? I
still get those not uncommonly. Might these also be do my using
expressions?

Thanks,

MM

>> xxxxx@winse.microsoft.com 2006-08-28 23:41 >>>
It means the page directory entry does not have the valid bit set.
What
arguments are you using? What exactly is the output you get? If you
see a zero pdi and pti you are probably missing the virtual address
argument. Also, the parser cannot handle expressions.

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Martin O’Brien
Sent: Monday, August 28, 2006 6:08 AM
To: Kernel Debugging Interest List
Subject: [windbg] !vtop Error: Page Directory Entry 1028 Not Valid…

ALL:

Does anyone know what “PageDirectory Entry 1028 not valid, try another
process” means when returned from !vtop? It seems to matter neither
what process is used nor, what virtual address. Is the just a different
manifestation of whatever was/is causing !vtop/!ptov to throw an
exception?

Thanks,

MM

You are currently subscribed to windbg as: xxxxx@winse.microsoft.com To
unsubscribe send a blank email to xxxxx@lists.osr.com

You are currently subscribed to windbg as: unknown lmsubst tag
argument: ‘’
To unsubscribe send a blank email to xxxxx@lists.osr.com

You are currently subscribed to windbg as: xxxxx@winse.microsoft.com To
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