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    SubjectRe: Linux 2.6.20-rc7
    On Wed, 31 Jan 2007 08:04:29 -0800 (PST)
    Linus Torvalds <torvalds@linux-foundation.org> wrote:

    >
    >
    > On Wed, 31 Jan 2007, Pawe__ Sikora wrote:
    > >
    > > The 2.6.20-rcX have the same nasty bug as 2.6.19.x.
    > >
    > > [ an oops inside kmem_get_pages ]
    > > http://bugzilla.kernel.org/show_bug.cgi?id=7889
    >
    > Pabel, can you detail more exactly which kernels don't work, and which do?
    >
    > >From bugzilla:
    >
    > - 2.6.18.x does work
    > - 2.6.19.2 doesn't work.
    > - what about plain 2.6.19?
    > - can you please test some of the 2.6.19-rcX kernels? Especially
    > 2.6.19-rc1 would be good to test.
    >
    > Since it apparently already happens in 2.6.19 (but it would be really good
    > to know exactly when it starts), and considering _where_ it happens, I'd
    > be inclined to blame commit d2e7b7d0: "fix potential stack overflow in
    > mm/slab.c" by Suresh.
    >
    > When do_tune_cpucache() is called at bootup, I'm not sure how safe it is
    > to do the kzalloc() thing.
    >
    > I've added a number of hopefully appropriate people to the Cc. Guys?
    > Apparently it only happens with MEMORY_HOTPLUG (and possibly with just an
    > SMP kernel on UP), which probably explains why it's been around without
    > people really complaining very loudly.
    >

    I discussed this with Yasunori Goto <y-goto@jp.fujitsu.com> (memory
    hot-add developer):

    "But this config uses CONFIG_MEMORY_HOTPLUG_RESERVE which is made by
    Andi Kleen-san and I don't know very well around here. And, I couldn't
    reproduce this trouble on my box."

    I cannot reproduce it with Pawel's config either.

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