Subject: Re: 2.6.24-git2: Oracle 11g VKTM process enters R state on startup
	and is unkillable [still broken in 2.6.25-rc1]
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Alessandro Suardi <alessandro.suardi@gmail.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, Ingo Molnar <mingo@elte.hu>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>
In-Reply-To: <5a4c581d0802120635k3aab6222y6066e4e344620088@mail.gmail.com>
References: <5a4c581d0802110820l1fcbb1ffib874f268b4ab7eae@mail.gmail.com>
	 <20080211204921.GA24806@elte.hu> <20080211221034.GA2587@elte.hu>
	 <200802120012.35314.rjw@sisk.pl> <1202823858.6247.26.camel@lappy>
	 <5a4c581d0802120635k3aab6222y6066e4e344620088@mail.gmail.com>
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Date: Tue, 12 Feb 2008 15:53:36 +0100
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On Tue, 2008-02-12 at 15:35 +0100, Alessandro Suardi wrote:
> On Feb 12, 2008 2:44 PM, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
> >
> > On Tue, 2008-02-12 at 00:12 +0100, Rafael J. Wysocki wrote:
> > > On Monday, 11 of February 2008, Ingo Molnar wrote:
> > > >
> > > > * Ingo Molnar <mingo@elte.hu> wrote:
> > > >
> > > > > no, they were not lost, they just didnt pass QA here (they crashed on
> > > > > a particularly hard to debug 8-way box i have) and Peter worked on
> > > > > that queue of fixes up until today to get it really correct. Could you
> > > > > check:
> > > > >
> > > > >    git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched.git
> > > > >
> > > > > combo patch below as well - whichever you prefer. The shortlog can be
> > > > > found below as well - but i dont yet consider this pullable, i'd like
> > > > > it to see pass a full night of randconfig tests on my test-systems.
> > > >
> > > > ok, we just found the reason for the 8-way crash, the delta fix from
> > > > Peter is below if any of you have tried the previous combo patch.
> > > > Updated sched.git as well, new HEAD is
> > > > fec13e45305d69fd0bd23b30bd05a0a42cf341f8.
> > >
> > > With the previous patch and this patch applied, the issue is not reproducible
> > > here.
> >
> > Did you enable CONFIG_RT_GROUP_SCHED (it defaults to n)?
> >
> > If you didn't, could you try with it set to y?
> 
> I just rebuilt 2.6.25-rc1-git2 with Ingo's patch and your patch on top,
>  and the Oracle VKTM issue is still gone even with
> 
> [asuardi@sandman ~]$ grep GROUP_SCHED
> /share/src/linux-2.6.25-rc1-git2-orafix/.config
> CONFIG_GROUP_SCHED=y
> CONFIG_FAIR_GROUP_SCHED=y
> CONFIG_RT_GROUP_SCHED=y
> # CONFIG_CGROUP_SCHED is not set
> 
>  so it's good for me.
> 
> Or is it necessary to also enable CONFIG_CGROUP_SCHED and retest ?

No that should be quite all-right. Thanks for testing!

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