linux-kernel - Re: [PATCH 41/50] sched: numa: Use {cpu, pid} to create task groups for shared faults

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Date:	Thu, 12 Sep 2013 20:45:52 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Rik van Riel <riel@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 41/50] sched: numa: Use {cpu, pid} to create task groups
 for shared faults

Hello Mel

On Tue, Sep 10, 2013 at 5:32 PM, Mel Gorman <mgorman@...e.de> wrote:
>
> +void task_numa_free(struct task_struct *p)
> +{
> +       struct numa_group *grp = p->numa_group;
> +       int i;
> +
> +       kfree(p->numa_faults);
> +
> +       if (grp) {
> +               for (i = 0; i < 2*nr_node_ids; i++)
> +                       atomic_long_sub(p->numa_faults[i], &grp->faults[i]);
> +
use after free :/

> +               spin_lock(&grp->lock);
> +               list_del(&p->numa_entry);
> +               grp->nr_tasks--;
> +               spin_unlock(&grp->lock);
> +               rcu_assign_pointer(p->numa_group, NULL);
> +               put_numa_group(grp);
> +       }
> +}
> +
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