Re: [Vserver] Re: [PATCH] race condition in procfs

From: Dennis Roos <>
Date: Tue 29 Nov 2005 - 14:50:35 GMT
Message-Id: <>

On Tue, 2005-11-29 at 15:39 +0100, Grzegorz Nosek wrote:
> 2005/11/29, Steven Rostedt <>:
> > Have you seen this crash the vanilla kernel? What exactly are you doing
> > to see the crash? If you have a script or something, could you post it.
> > I could spend some time helping you debug it too on one of my SMP boxes.
> >
> I'm not really using vanilla 2.6 kernels and my setup would be quite
> hard to run on a vanilla kernel.
> The reproduceability of this bug varies. Sometimes it'll go for a few
> days without happening, sometimes it's a matter of a few minutes. I'm
> beginning to feel it's a vserver issue after all, somehow related to
> pid virtualisation (it maps some vxi->vx_initpid to 1).
> Thus I cannot provide a simple script to trigger the bug (I wish I
> could) but often doing a -j8 kernel compile in a vserver is enough.
As I said earlier in this thread, I would like to be of assistance in
tracking this down.

I am not that familiar with debugging this stuff, but have a box at home
(that has apparently just crashed as I cannot reach it atm.) on which I
can reproduce the hang quite easily ( tar -C /opt/data/templates/ -xf
TEMPLATE.tgz | tar -C /vservers/ -xf - ;# crashes my box
time..and..time..again). So if anyone can give me a bit more debugging
clue, I am willing to spend some time in tracking this down.

The machine itself is an abit bp6 dual celeron running gentoo linux and
the gentoo vserver kernel from a month orso ago, which is vs2.1.0pre5
afaik - all prior functions crashed at the same rate as well.

Dennis Roos
Network Engineer @ InTouch N.V.
Middenweg 76
1097 BS Amsterdam
Tel: +31 (0)20 6752060
Fax: +31 (0)20 6758429
-=[Assumption is the mother of all f*ckups]=-
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