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

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Date:	Wed, 9 Oct 2013 20:56:11 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [x86] BUG: unable to handle kernel paging request at 00740060

On Wed, Oct 09, 2013 at 02:27:05PM +0200, Peter Zijlstra wrote:
> On Wed, Oct 09, 2013 at 08:19:11PM +0800, Fengguang Wu wrote:
> > > > Fengguang, I do not think this will help, but just in case. Could you
> > > > show the result of
> > > > 
> > > >         $ kernel/task_work.s
> > 
> > Update: I recompiled the kernel with gcc 4.4.7 and find it booting fine!
> 
> > # 208 "/c/wfg/tip/arch/x86/include/asm/bitops.h" 1
> > 	bts $1, 8(%eax); setc %dl	#,, c
> 
> That compiler doesn't appear to have asm goto support, so we fall back
> to the code we already knew worked :-)

Ah OK..

btw, here is a simple script I used to reproduce the problem. I'll
attach the 3MB yocto initrd in another email. However I suspect
whatever initrd would be OK.

Thanks,
Fengguang

Download attachment "kvm-0day.sh" of type "application/x-sh" (723 bytes)