Re: assert/crash in __rmqueue() when enabling CONFIG_NUMA

[Ingo Molnar <mingo@elte.hu>]

* Andi Kleen <ak@suse.de> wrote:

> On Tuesday 02 May 2006 09:06, Ingo Molnar wrote:
> > 
> > * Andi Kleen <ak@suse.de> wrote:
> > 
> > > Ingo Molnar <mingo@elte.hu> writes:
> > > 
> > > > FYI, even on 2.6.17-rc3 i get the one below. v2.6.17 showstopper i 
> > > > guess?
> > > 
> > > Did you send a full boot log?
> > 
> > yes, in the previous mail, in the same thread. (maybe lkml ate it - it's 
> > an allyesconfig bootup so a large bootlog and a large config) I've also 
> > uploaded them to:
> > 
> > 	http://redhat.com/~mingo/misc/
> > 
> > debug-pagealloc.patch is the debug patch i made based on Nick's earlier 
> > suggestions.
> > 
> > > If it's using ACPI NUMA try numa=noacpi - it might be some problem 
> > > with the node discovery on your machine.
> > 
> > this is a non-NUMA box (Athlon64 X2 desktop machine).
> 
> Oh that's a 32bit kernel. I don't think the 32bit NUMA has ever worked 
> anywhere but some Summit systems (at least every time I tried it it 
> blew up on me and nobody seems to use it regularly). Maybe it would be 
> finally time to mark it CONFIG_BROKEN though or just remove it (even 
> by design it doesn't work very well)

what you saw before could easily be this particular bug - the zones are 
apparently mis-sized (aligned to 1MB while they need to be aligned to 
4MB), which causes quick and nasty crashes under light user load.

	Ingo