linux-kernel - Re: [PATCH v2 00/18] Entry stack switching

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Date:   Wed, 22 Nov 2017 07:22:58 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     X86 ML <x86@...nel.org>, Borislav Petkov <bpetkov@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v2 00/18] Entry stack switching


* Andy Lutomirski <luto@...nel.org> wrote:

> This sets up stack switching, including for SYSCALL.  I think it's
> in decent shape.
> 
> Known issues:
>  - I think we're going to want a way to turn the stack switching on and
>    off either at boot time or at runtime.  It should be fairly straightforward
>    to make it work.
> 
>  - I think the ORC unwinder isn't so good at dealing with stack overflows.
>    It bails too early (I think), resulting in lots of ? entries.  This
>    isn't a regression with this series -- it's just something that could
>    be improved.
> 
> Ingo, patch 1 may be tip/urgent material.  It fixes what I think is
> a bug in Xen.  I'm having a hard time testing because it's being
> masked by a bigger unrelated bug that's keeping Xen from booting
> when configured to hit the bug I'm fixing.  (The latter bug goes at
> least back to v4.13, I think I know roughtly what's wrong, and I've
> reported it to the maintainers.)

Hm, with this series the previous IRQ vector bug appears again:

[   51.156370] do_IRQ: 16.34 No irq handler for vector
[   57.511030] do_IRQ: 16.34 No irq handler for vector
[   57.528335] do_IRQ: 16.34 No irq handler for vector
[   57.533256] do_IRQ: 16.34 No irq handler for vector
[   63.991913] do_IRQ: 16.34 No irq handler for vector
[   63.996810] do_IRQ: 16.34 No irq handler for vector

I've attached the reproducer config. Note that the system appears to be working to 
a certain extent (I could ssh to it and extract its config), but produces these 
warnings sporadically.

Also note that this is the same AMD system tha had irq-tracing/lockdep troubles 
yesterday. So maybe this warning is related and we either have broken lockdep, or 
these IRQ vector warnings.

Thanks,

	Ingo

View attachment "config" of type "text/plain" (112299 bytes)