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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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