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

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Message-ID: <3908561D78D1C84285E8C5FCA982C28F3292D57B@ORSMSX114.amr.corp.intel.com>
Date:	Thu, 13 Nov 2014 22:33:37 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Andy Lutomirski <luto@...capital.net>
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

> 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.

-Tony

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