Date: Tue, 29 Nov 2005 09:49:44 -0500 (EST)
From: Steven Rostedt <rostedt@goodmis.org>
To: Grzegorz Nosek <grzegorz.nosek@gmail.com>
cc: vserver@list.linux-vserver.org, linux-kernel@vger.kernel.org,
       Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH] race condition in procfs
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On Tue, 29 Nov 2005, Grzegorz Nosek wrote:

>
> 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.
>

What you are showing, would probably show up by others if this were a
vanilla kernel issue.  I don't have an 8 way machine, just 2 way, but the
vanilla kernel is being used on many 8 ways out there, so I think you are
right that this _is_ a vserver issue.

Unless, of course, that the vserver is producing an obscure race in the
vanilla kernel that normal operations would seldom have.  Just like the
PREEMPT_RT patch has discovered many race conditions that were in the
vanilla kernel but were not often a problem.

-- Steve

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