[okl4-developer] Roottask pagefault

[Geoffrey Lee]

On Wed, Feb 20, 2008 at 02:54:34PM +1100, Ryan Heffernan wrote:
> I am currently attempting to port application that was written for an
> older version of L4 and Iguana (from 2005) to the current OKL4/Iguana
> release and have a successful compilation but whenever I try to boot the
> image and run the an example completely unrelated to the new stuff (the
> multithread example) I get a roottask pagefault. The multithread example
> works fine without my new code (ie. when I comment out the code in the
> Iguana SConstruct that adds my new application to the build). The error
> always looks like this:
> 
> vbase is 0xa4000000, vend is 0xcfffffff
> addr is 0xa4000000, vbase is 0xa4000000
> roottask read pagefault at 33cc33c8, ip=800023e0 - deny
> 
> I have determined that the pagefault is thrown by the get_pd function in
> iguana_server.c, which is called by iguana_pd_ext_l4id_impl function in
> the same file. Would you have any ideas as to the cause or solution to
> this error? 


Hi

I think the problem is that you may be passing in an invalid pd
reference, the pd_ref_t appears to be cast to a pd structure pointer
in the Iguana server directly then passed to the is_pd() macro
to be dereferenced.

	-gl
> 
> 
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