[Lguest] unhandled trap 14 for low mem?

[Rusty Russell]

On Sun, 12 Jun 2011 19:19:32 +0300, Avi Kivity <avi at redhat.com> wrote:
> On 06/08/2011 03:31 PM, octane indice wrote:
> > Hello,
> >
> > I have a slackware 13.37 distribution with a 2.6.37.6 kernel.
> >
> > lguest seems unable to launch on low mem:
> > $ ./lguest-2.6.37.6 16 --block slack.img bzImage-2.6.37.6 ro root=/dev/vda1
> > lguest-2.6.37.6: unhandled trap 14 at 0x10003d (0x214bb7c)
> >
> > With more mem it's OK:
> > $ ./lguest-2.6.37.6 48 --block slack.img bzImage-2.6.37.6 ro root=/dev/vda1
> > (taking some time, then )

Interesting!  Let's try that here.

My vmlinux is 6.7MB.  I can get down to 12MB (and I get to userspace and
the OOM killer goes nuts).  At 8MB, init gets killed.  At 6, I get that
same trap.

It's trying to clear the bss, very early in boot.

> > So, is there a minimum RAM requirement for lguest?
> >
> 
> There's a minimum requirement for Linux itself (which varies with the 
> configuration).

Indeed.

Thanks,
Rusty.