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SubjectRe: repeatable slab corruption with LTP msgctl08
On Wed, 11 Jun 2008 23:34:49 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:

> On Wed, 11 Jun 2008 22:13:24 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
>
> > Running current mainline on my old 2-way PIII. Distro is RH FC1. LTP
> > version is ltp-full-20070228 (lots of retro-computing there).
> >
> > Config is at http://userweb.kernel.org/~akpm/config-vmm.txt
> >
> >
> > ./testcases/bin/msgctl08 crashes after ten minutes or so:
>
> ah, it runs to completion in about ten seconds on 2.6.25, so it'll be
> easy for someone to bisect it.
>
> What's that? Sigh. OK. I wasn't doing anything much anyway.

Oh drat. git-bisect tells me that this one-year-old msgctl08's
execution time vastly increased when we added

commit f7bf3df8be72d98afa84f5ff183e14c1ba1e560d
Author: Nadia Derbey <Nadia.Derbey@bull.net>
Date: Tue Apr 29 01:00:39 2008 -0700

ipc: scale msgmni to the amount of lowmem


But we already knew that, and LTP got changed to fix it.

So I was wrong in assuming that the long-execution-time correlates with
the slab-corruption bug.

And the slab corruption bug takes half an hour to reproduce and an
unknown amount of time to not-reproduce. I don't think I'll be able to
complete this before I disappear for over a week.



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