In some mail I received from Jason Thorpe, sie wrote
> On Wed, 4 Mar 1998 20:28:11 +0100 
>  Frank van der Linden <frank@wins.uva.nl> wrote:
> 
>  > I'm not sure anymore about this case, but: you may also simply be
>  > running out of KVM, even if you have enough PDEs. For machines >= 64M,
>  > you will always get enough PDEs for all of the possible 256 - 4 Mb
>  > of KVM. But the kernel on the i386 simply has a limited amount
>  > to work with.
> 
> I don't think it's KVM, in this case.  It looks like it might be possible
> to lose on a reference to a USER pmap... i.e. for some reason, the PT page
> hasn't been allocated by the time pmap_enter() is called, for some reason,
> possibly trap() being confused by how the reference is made to the address
> (seems like the hueristics used to determine user fault vs. kernel fault
> are fragile; this is definitely the case on the m68k, as Chuck Cranor,
> Steve Woodford, and I discovered last week while trying to find a panic
> condition on the hp300 that occured while using UVM).

Has anyone tested this bug on a UVM system ?

Darren