linux-kernel - Re: [BUG] in sched fair on v3.13-rc1+ doing hotplug

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Message-ID: <20131127090845.0d728946@gandalf.local.home>
Date:	Wed, 27 Nov 2013 09:08:45 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	svaidy@...ux.vnet.ibm.com, vincent.guittot@...aro.org,
	bitbucket@...ine.de, benh@...nel.crashing.org, anton@...ba.org,
	Morten.Rasmussen@....com, pjt@...gle.com, mikey@...ling.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [BUG] in sched fair on v3.13-rc1+ doing hotplug

On Wed, 27 Nov 2013 14:22:43 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> On Wed, Nov 27, 2013 at 08:13:45AM -0500, Steven Rostedt wrote:
> >         atomic_inc(&sd->groups->sgp->nr_busy_cpus);  <<---- BUG
> > unlock:
> >         rcu_read_unlock();
> > }
> 
> tip/sched/urgent has this one:
> 
> ---
> commit 42eb088ed246a5a817bb45a8b32fe234cf1c0f8b
> Author: Peter Zijlstra <peterz@...radead.org>
> Date:   Tue Nov 19 16:41:49 2013 +0100
> 
>     sched: Avoid NULL dereference on sd_busy

After applying this patch, the bug does go away.

Thanks!

-- Steve
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