* Andy Lutomirski <l...@kernel.org> wrote:
> On Fri, Nov 24, 2017 at 12:22 PM, Ingo Molnar <mi...@kernel.org> wrote:
> >
> > * Ingo Molnar <mi...@kernel.org> wrote:
> >
> >> This is a repost of the latest entry-stack plus Kaiser bits from Andy
> >> Lutomirski
> >> (v3 series from today) and Dave Hansen (kaiser-414-tipwip-20171123
> >> version),
> >> on top of latest tip:x86/urgent (12a78d43de76).
> >>
> >> This version is pretty well tested, at least on the usual x86 tree test
> >> systems.
> >> It has a couple of merge mistakes fixed, the biggest difference is in
> >> patch #22:
> >>
> >> x86/mm/kaiser: Prepare assembly for entry/exit CR3 switching
> >>
> >> The other patches are identical or very close to what I posted earlier
> >> today.
> >
> > Here's a new bug, on a testsystem I get the double fault boot crash attached
> > below. The same bzImage crashes on other systems as well, so it's not CPU
> > dependent.
> >
> > Via Kconfig-bisection I have narrowed it down to the following .config
> > detail:
> > it's triggered by _disabling_ CONFIG_DEBUG_ENTRY and enabling
> > CONFIG_KAISER=y.
> >
> > I.e. one of the sanity checks of CONFIG_DEBUG_ENTRY has some positive side
> > effect.
>
> That's weird and definitely not intentional.
Btw., can you reproduce the crash by disabling CONFIG_DEBUG_ENTRY with
CONFIG_KAISER=y?
Thanks,
Ingo
