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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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