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

From: Steven Rostedt <rostedt_at_goodmis.org>
Date: Tue 29 Nov 2005 - 14:49:44 GMT
Message-ID: <Pine.LNX.4.58.0511290945380.7838@gandalf.stny.rr.com>

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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