Re: [Xen-devel] BUG grant_table.c line 939

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 23 Jan 2006, at 21:13, King, Steven R wrote:

> After trials and tribulations getting my serial ports in order, I'm
> finally able to report on a Xen crash I've been seeing.
>
> I have two domUs that share & map grant references with each other, 
> then
> both domUs crash.  Shortly thereafter, Xen crashes too.
>
> With dead domUs, the grant references they once held are left orphaned.
> Xen isn't provisioned to mop this up, hence the well placed
> BUG(rd==NULL).  Make any sense?  I'd be over my head to submit a patch
> for this, so I'm hoping for help.
Let's say domain A maps pages belonging to domain B (implying that B 
granted access to A).
If B crashes then the domain should stick around as a zombie until all 
mappings of its pages by other domains have gone away. This should mean 
that if A crashes or dies and calls gnttab_release_mappings(), it 
should not be possible for B to have disappeared at that point, and 
find_domain_by_id() should succeed.
Neither of your domains are running on shadow page tables, are they?

 -- Keir


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