Re: Unable to handle kernel...

[Herbert Poetzl]

On Wed, Oct 08, 2003 at 04:29:28PM +0200, Emmanuel Fleury wrote:
> Hi,
> 
> I am pretty new in coding for the kernel and I was wandering what is the
> _deep_ meaning of:
> 
> "Unable to handle kernel paging request at virtual address XXXX" 

some page was requested, (probably via a pointer
dereference, read or write), which led to a page
fault, which in turn could not be satisfied by
loading/providing the requested page, because it
simply isn't there (usually wrong address)

> and 
> "Unable to handle kernel NULL pointer dereference".

some pointer (value = NULL) was dereferenced, which
should be considered an error, this caused the oops
which (probably) follows those lines (reg/stackdump)

	int *test = NULL;
	int v = test[0];	// bad!

> If somebody could explain this to me, I would be very pleased ! :)

probably there are better explanations,

HTH,
Herbert

> PS: I know already how to trace an Oops by using ksymoops. But these two
> errors are puzzling me and I would like to understand more about it.
> 
> Regards
> -- 
> Emmanuel
> 
> The tradition of open science has done more to build the modern
> economy than Microsoft ever will.
>   -- Linus Torvalds
> 
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