* Ingo Molnar <mi...@kernel.org> wrote:
> > diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
> > index 4ac952080869..ea992ca4e74f 100644
> > --- a/arch/x86/entry/entry_64.S
> > +++ b/arch/x86/entry/entry_64.S
> > @@ -547,6 +547,8 @@ END(irq_entries_start)
> > ud2
> > .Lokay_\@:
> > addq $8, %rsp
> > +#else
> > + .rep 64; nop; .endr
>
> Also note that turning off CONFIG_UNWINDER_ORC also solves the crash. I did
> that
> in an attempt to get a different backtrace.
>
> So it's either unwinder related, or seemingly minor changes to code
> alignment/placement will make the bug go away.
Ok, I think the Orc unwinder is innocent: I just forced a build with frame
pointers but with ORC debuginfo and unwinder, and that is booting fine too.
So it's the specific code size and alignment present in the config I sent that
is
triggering the bug. Fudging that alignment/sizing with the workaround patch
above
makes the crash go away.
Thanks,
Ingo
