linux-kernel - Re: [PATCH]sched/rt.c: leaf_rt_rq_list contains empty queues. Fix it

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1348237890.13080.72.camel@gandalf.local.home>
Date:	Fri, 21 Sep 2012 10:31:30 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Kirill Tkhai <tkhai@...dex.ru>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH]sched/rt.c: leaf_rt_rq_list contains empty queues. Fix it

On Fri, 2012-09-21 at 17:35 +0400, Kirill Tkhai wrote:
> Function __enqueue_rt_entity() adds an empty queue to leaf_rt_rq_list.
> 
> So, pick_next_highest_task_rt() picks empty queues. Fix it.

Do you have an example where this breaks?

> 
> Signed-off-by: Kirill Tkhai <tkhai@...dex.ru>
> ---
>  kernel/sched/rt.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
> index 944cb68..b07edb9 100644
> --- a/kernel/sched/rt.c
> +++ b/kernel/sched/rt.c
> @@ -1103,7 +1103,7 @@ static void __enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head)
>  	if (group_rq && (rt_rq_throttled(group_rq) || !group_rq->rt_nr_running))
>  		return;
>  
> -	if (!rt_rq->rt_nr_running)
> +	if (rt_rq->rt_nr_running)
>  		list_add_leaf_rt_rq(rt_rq);

Note, the list_add_leaf_rt_rq() is called when the first task is queued
up. The function here is __enqueue_rt_entity(), which will increment
rt_rq->rt_nr_running. If this is the first entry we add the queue now,
as the __dequeue_rt_entity() does the list_del_leaf_rt_rq() when it goes
to zero.

-- Steve

>  
>  	if (head)


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/