linux-kernel - Re: BUG from text_poke() during CPU offlining

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Message-ID: <20090420194723.GB7106@us.ibm.com>
Date:	Mon, 20 Apr 2009 12:47:23 -0700
From:	Gary Hade <garyhade@...ibm.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Gary Hade <garyhade@...ibm.com>, mingo@...e.hu, mingo@...hat.com,
	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: BUG from text_poke() during CPU offlining

On Wed, Apr 08, 2009 at 01:21:18PM -0700, Masami Hiramatsu wrote:
> Hi Gary,
> 
> Gary Hade wrote:
> > I ran into the below BUG with 32-bit 2.6.30-rc1 while offlining
> > all of the offlineable CPUs.  It happened when the last offlineable
> > CPUs was being offlined.  The problem disappeared after I reverted
> > the following two patches.
> >  - x86: implement atomic text_poke() via fixmap
> >    http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=78ff7fae04554b49d29226ed12536268c2500d1f
> >  - x86: expand irq-off region in text_poke()
> >    http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=7cf49427042400d40bdc80b5c3399b6b5945afa8
> 
> Hmm, this bug seems that the same bug I reported recently.
> 
> http://lkml.org/lkml/2009/4/4/71
> 
> I'm working on that.

Masami,
Just confirming that I can no longer reproduce the problem with
2.6.30-rc2 which includes your fix (http://lkml.org/lkml/2009/4/10/346).

> 
> Thank you for reporting!

Thank you for fixing!

Gary

-- 
Gary Hade
System x Enablement
IBM Linux Technology Center
503-578-4503  IBM T/L: 775-4503
garyhade@...ibm.com
http://www.ibm.com/linux/ltc
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