linux-kernel - Re: [BUG: NULL pointer dereference] cgroups and RT scheduling interact badly.

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Date:	Tue, 17 Jun 2008 23:03:21 +0200
From:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>
To:	"Peter Zijlstra" <peterz@...radead.org>
Cc:	"Daniel K." <dk@...no>, mingo@...e.hu, menage@...gle.com,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [BUG: NULL pointer dereference] cgroups and RT scheduling interact badly.

2008/6/17 Peter Zijlstra <peterz@...radead.org>:
> On Tue, 2008-06-17 at 14:25 +0200, Daniel K. wrote:
>> Peter Zijlstra wrote:
>> > How's this [patch] work for you? (includes the previuos patchlet too)
>>
>> Thanks,
>>
>> this patch fixed the obvious problem, namely
>>
>> # echo $$ > /dev/cgroup/burn/oops/tasks
>> # schedtool -R -p 1 -e burnP6 &
>>
>> now works again. However, the last step below
>>
>> # echo $$ > /dev/cgroup/tasks
>> # burnP6 &
>> [1] 3414
>> # echo 3414 > /dev/cgroup/burn/oops/tasks
>> # schedtool -R -p 1 3414
>>
>> gives this new and shiny Oops instead.
>
> Whilst I'm gracious for your testing, I truly hope you're done breaking
> my stuff ;-)
>
> How's this for you?

FYI, I could reproduce a crash and this patch fixes it indeed.


-- 
Best regards,
Dmitry Adamushko
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