linux-kernel - Re: [PATCH] sched/fair: Fix RCU stall upon ENOMEM at sched_create

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Message-ID: <20150106103533.GO29390@twins.programming.kicks-ass.net>
Date:	Tue, 6 Jan 2015 11:35:33 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/fair: Fix RCU stall upon ENOMEM at
 sched_create_group().

On Thu, Dec 25, 2014 at 10:10:45PM +0900, Tetsuo Handa wrote:
> >From 052595ab1a1d1c5668d9de61395c9cc17694597e Mon Sep 17 00:00:00 2001
> From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Date: Thu, 25 Dec 2014 15:51:21 +0900
> Subject: [PATCH] sched/fair: Fix RCU stall upon ENOMEM at sched_create_group().
> 
> When alloc_fair_sched_group() in sched_create_group() failed,
> free_sched_group() is called, and free_fair_sched_group() is called by
> free_sched_group(). Since destroy_cfs_bandwidth() is called by
> free_fair_sched_group() without calling init_cfs_bandwidth(),
> RCU stall occurs at hrtimer_cancel().
> 

Thanks
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