On Wed, 31 Jan 2007, PaweÅ 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.
Linus
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