linux-kernel - Re: [RFC PATCH] x86, entry: Switch stacks on a paranoid entry from userspace

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Message-ID: <CALCETrVB9VQPqFb7GQyxmVEKYtPhppmZS8SewQmtre+3_su9FA@mail.gmail.com>
Date:	Thu, 13 Nov 2014 14:47:12 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, Borislav Petkov <bp@...en8.de>,
	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC PATCH] x86, entry: Switch stacks on a paranoid entry from userspace

On Thu, Nov 13, 2014 at 2:33 PM, Luck, Tony <tony.luck@...el.com> wrote:
>> Are you sure that this works in an unmodified kernel
>
> Unmodified kernel has run tens of thousands of injection/consumption/recovery cycles.
>
> I did get a crash with the entry/exit traces you asked for.  Last 20000 lines of console log
> attached.  There are a couple of OOPs before things fall apart completely.  I haven't yet
> counted all the entry/exits from the last cycle to see if they match.
>

That log was a good hint, and I am a fool.  I'll send a v3 once I test it.

I'm still unconvinced by the timeout code, though...

---Andy

> -Tony
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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