linux-kernel - Re: Bug in scheduler when using rt

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Message-ID: <AANLkTikXf-OMEBx-UZktxooOs+YqUkSE9doyEZopjzOx@mail.gmail.com>
Date:	Tue, 18 Jan 2011 16:59:04 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	samu.p.onkalo@...ia.com
Cc:	ext Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	tglx <tglx@...utronix.de>
Subject: Re: Bug in scheduler when using rt_mutex

On Tue, Jan 18, 2011 at 4:23 PM, Onkalo Samu <samu.p.onkalo@...ia.com> wrote:
> On Mon, 2011-01-17 at 17:00 +0100, ext Peter Zijlstra wrote:
>> On Mon, 2011-01-17 at 16:42 +0200, Onkalo Samu wrote:
>> >
>> > Failure case:
>> > - user process locks rt_mutex
>> > - and goes to sleep (wait_for_completion etc.)
>> > - user process is dequeued to sleep state
>> > -> vruntime is not updated in dequeue_entity
>> >
>>
>> Does the below (completely untested) patch help?
>
> Unfortunately no.

It couldn't work because place_entity() will not place it
backwards.


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