Re: [v7, 05/11] x86/retpoline/entry: Convert entry assembler indirect jumps
From: Andrei Vagin
Date: Wed Jan 10 2018 - 00:23:35 EST
On Tue, Jan 09, 2018 at 08:39:21PM -0800, Dave Hansen wrote:
> On 01/09/2018 08:30 PM, Andi Kleen wrote:
> > On Tue, Jan 09, 2018 at 07:54:08PM -0800, Andrei Vagin wrote:
> >>
> >> In my test environment, the kernel with this patch crashes.
> >
> > I posted a patch for this.
>
> It's called:
>
> [PATCH v3 2/3] x86/retpoline: Use better sequences for NOSPEC_CALL/JMP
>
> right, Andi?
This patch fixed the problem. Thanks!
>
> BTW, that's a fun oops. It looks like it's call'ing (or jumping) to an
> address that's used by cpu_entry_area->exception_stacks[1].