linux-kernel - Re: Regression with idle cpu cycle handling in 2.6.24 (compared to 2.6.22)

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Message-ID: <bcadbdf50801211759j5e55ba88n26c24b2f12afaf26@mail.gmail.com>
Date:	Tue, 22 Jan 2008 02:59:26 +0100
From:	"dAniel hAhler" <dhahler@...glemail.com>
To:	vatsa@...ux.vnet.ibm.com
Cc:	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>
Subject: Re: Regression with idle cpu cycle handling in 2.6.24 (compared to 2.6.22)

On Jan 21, 2008 6:18 PM, Srivatsa Vaddagiri wrote:
> On Sun, Jan 20, 2008 at 09:03:38AM +0530, Dhaval Giani wrote:
> > > btw: writing 1 into "cpu_share" totally locks up the computer!
> > >
> >
> > Can you please provide some more details. Can you go into another
> > console (try ctrl-alt-f1) and try to reproduce the issue there. Could
> > you take a photo of the oops/panic and upload it somewhere so that we
> > can see it?
>
> I couldn't recreate this problem either on 2.6.24-rc8.
>
> Daniel,
>         Could you pass the config file you used pls?

Sure, I've uploaded the config to
http://codeprobe.de/tmp/config-2.6.24-4-generic

It only happens when changing the cpu_share for another user and this
user needs to have a cpu hogging process running (like boinc, a
while-1 loop or similar).
It does not dump anything to the console, but the VirtualBox process
on the host takes all CPU - there seems to be no crash, but an endless
loop only.

I have reported it at http://bugzilla.kernel.org/show_bug.cgi?id=9779
already, with a testcase (outlined above).

Thank you for your help.

-- 
http://daniel.hahler.de/
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