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SubjectRe: 2.6.26-rc9: Reported regressions from 2.6.25
On Sun, Jul 06, 2008 at 06:58:10PM +0200, Ingo Molnar wrote:
>
> * Linus Torvalds <torvalds@linux-foundation.org> wrote:
>
> > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=10815
> > > Subject : 2.6.26-rc4: RIP find_pid_ns+0x6b/0xa0
> > > Submitter : Alexey Dobriyan <adobriyan@gmail.com>
> > > Date : 2008-05-27 09:23 (41 days old)
> > > References : http://lkml.org/lkml/2008/5/27/9
> > > http://lkml.org/lkml/2008/6/14/87
> > > Handled-By : Oleg Nesterov <oleg@tv-sign.ru>
> > > Linus Torvalds <torvalds@linux-foundation.org>
> > > Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> > > Patch : http://lkml.org/lkml/2008/5/28/16
> >
> > This one is the same thing that is reported as unresolved, and no, I
> > don't think that existing patch was ever really tested to fix
> > anything. Paul?
> >
> > I suspect SRCU will need to be simply marked BROKEN for now, because
> > nobody knows what the problem Alexey sees is. Apparently it's been
> > seen by a few other people too.
>
> I'm not sure it's directly related to SRCU - it can change timings and
> freeing patterns enough to tickle other bugs. Since Alexey Dobriyan has
> reported it - are perhaps namespaces in use during this stress-test?
> Maybe it's some namespaces related bug that is more easily reproduced
> under SRCU - namespaces is not a commonly tested feature.

I have CONFIG_NAMESPACES=y. Should I also set one or more of
CONFIG_UTS_NS, CONFIG_IPC_NS, CONFIG_USER_NS, or CONFIG_PID_NS?

What the heck, I will just set them all and pound away on kernbenchx170
and rcutorture.

Thanx, Paul

> Also, i've been running rcutorture stress-tests on a number of
> test-systems ever since this got reported (and they are running
> currently as well) and cannot see it - neither could Paul reproduce it.
>
> ( and Paul is very good in producing RCU related problems - he's
> triggered and fixed many RCU related problems that no-one else saw
> before. )
>
> Ingo


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