Re: kmemleak, cpu usage jump out of nowhere

[Pekka Enberg]

Zeno Davatz wrote:
> On Wed, Jul 14, 2010 at 10:31 AM, Damien Wyart <damien.wyart@xxxxxxx> wrote:
>
> > > On Wed, Jul 14, 2010 at 9:12 AM, Zeno Davatz <zdavatz@xxxxxxxxx> wrote:
> > > > I got a new Intel core-8 i7 processor.
> > > > I am on kernel uname -a
> > > > Linux zenogentoo 2.6.35-rc5 #97 SMP Tue Jul 13 16:13:25 CEST 2010 i686
> > > > Intel(R) Core(TM) i7 CPU 960 @ 3.20GHz GenuineIntel GNU/Linux
> > > > Sometimes in the middle of nowhere all of a sudden all of my 8-cores
> > > > are at 100% CPU usage and my machine really lags and hangs and is not
> > > > useable anymore. Some random process just grabs a bunch CPUs according
> > > > to htop.
> > * Pekka Enberg <penberg@xxxxxxxxxxxxxx> [2010-07-14 11:05]:
> > > Why did you enable CONFIG_DEBUG_KMEMLEAK? Memory leak scanning is
> > > likely the source of these pauses.
> > I am seeing the same problem with a Core i7 920 and 2.6.35-rc5, and I do
> > not have CONFIG_DEBUG_KMEMLEAK enabled, so I think this is not related.
> >
> > I do not see anything special in the logs, just the load becoming mad
> > and almost preventing ssh access. I've been seeing that since the first
> > 2.6.35 rc I tested (-rc2 or -rc3, I don't remember) and I did not have
> > time to report it before but I was surprised nobody else did. No problem
> > with 2.6.34 and 2.6.34.1.
>
> same with me. My last build I tested was 2.6.34-rc7. No problems
> there. No CPU jumps out of nowhere.
>
> It is like any application all of a sudden use 400% CPU i.e. htop.

Interesting. Lets CC some scheduler folks for help.

			Pekka
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