Re: init receiving SIGILL on XEN3_DOM0/amd64

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Sun, May 18, 2008 at 09:32:32PM +1000, James Laird wrote:
> On Sun, May 18, 2008 at 01:14:34PM +0200, Manuel Bouyer wrote:
> > On Sun, May 18, 2008 at 01:09:54PM +0200, Christoph Egger wrote:
> > > What are the normal conditions where the kernels sends SIGILL to userland?
> > 
> > When the CPU sends an illegal intruction trap, I guess.
> 
> Turning on debugging in arch/amd64/amd64/trap.c (TRAP_SIGDEBUG) would confirm 
> that:
> 
> pid 1 (init): ILL at rip 7f7ffde03670 addr 7f7fffffffd8
> rip 0x7f7ffde03670  rsp 0x7f7fffffde98  rfl 0x202

Could you set a breakpoint just after this printf (or add a call to
Debugger()), and see what is at the rip ?
The output of both
x/i 7f7ffde03670
and
x/x 7f7ffde03670 (and subsequent addresses, just press enter to get the
next value) could be usefull.

If you have a working amd64 kernel, you can also compare this with what
gdb /sbin/init says for this address.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--