linux-kernel - Re: [patch] cpuset: fix crash when adding CPUs to an empty set

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Message-ID: <1422446595.5716.34.camel@marge.simpson.net>
Date:	Wed, 28 Jan 2015 13:03:15 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Zefan Li <lizefan@...wei.com>, LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [patch] cpuset: fix crash when adding CPUs to an empty set

On Wed, 2015-01-28 at 12:53 +0100, Peter Zijlstra wrote: 
> On Wed, Jan 28, 2015 at 12:24:52PM +0800, Zefan Li wrote:
> > > sched: Fix crash if cpuset_cpumask_can_shrink() is passed an empty cpumask
> > > 
> > > While creating an exclusive cpuset, we passed cpuset_cpumask_can_shrink()
> > > an empty cpumask (cur), and dl_bw_of(cpumask_any(cur)) made boom with it.
> > > 
> 
> Is this the case where a new cpuset doesn't yet have CPUs assigned?

Yes.

-Mike


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