linux-kernel - Re: PANIC: double fault, error_code: 0x0 in 4.0.0-rc3-2, kvm related?

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Message-ID: <alpine.LRH.2.00.1503182320490.13021@twin.jikos.cz>
Date:	Wed, 18 Mar 2015 23:22:03 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Andy Lutomirski <luto@...capital.net>
cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stefan Seyfried <stefan.seyfried@...glemail.com>,
	Takashi Iwai <tiwai@...e.de>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>
Subject: Re: PANIC: double fault, error_code: 0x0 in 4.0.0-rc3-2, kvm
 related?

On Wed, 18 Mar 2015, Andy Lutomirski wrote:

> sysret64 can only fail with #GP, and we're totally screwed if that
> happens, 

But what if the GPF handler pagefaults afterwards? It'd be operating on 
user stack already.

-- 
Jiri Kosina
SUSE Labs

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