linux-kernel - Re: [x86] BUG: unable to handle kernel paging request at 00740060

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Message-ID: <20131009190231.GI13848@laptop.programming.kicks-ass.net>
Date:	Wed, 9 Oct 2013 21:02:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jakub Jelinek <jakub@...hat.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Richard Henderson <rth@...ddle.net>
Subject: Re: [x86] BUG: unable to handle kernel paging request at 00740060

On Wed, Oct 09, 2013 at 08:16:13PM +0200, Jakub Jelinek wrote:
> Confirmed as gcc bug, filed http://gcc.gnu.org/PR58670
> Seems all of 4.[6-9] miscompile it.  Will have a look tomorrow
> unless somebody beats me to it.  But historically, the case where
> asm goto labels jump to fallthru basic block had numerous problems in the
> past.

That bug lists the component as middle end; this suggests x86_64 would
be vulnerable too, can you confirm? So far we've only observed the wrong
code on i386 targets, x86_64 targets appeared correct.
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