Re: (XEN) Xen BUG at page_alloc.c:385

[Dietmar Hahn <dietmar.hahn@ts.fujitsu.com>]

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Am 19.10.2010 schrieb "Jan Beulich <JBeulich@novell.com>":
> >>> On 19.10.10 at 14:16, Dietmar Hahn <dietmar.hahn@ts.fujitsu.com> wrote:
> > (XEN) Xen BUG at page_alloc.c:385
> > 
> >     The code line is:
> >         BUG_ON(pg[i].count_info != PGC_state_free);
> >     Is it possible in any way that a free page is in use? Or is it always a
> >     failure somewhere in the code like a multiple use of the same page?
> 
> Free pages are never in use for anything, so getting this BUG_ON()
> to trigger means e.g. something modified a page's state after it was
> already passed back to the allocator.
> 
> Did you check that this is not another manifestation of the problem
> fixed by c/s 22135 (we have a backport of this in our tree, but it's
> not clear whether yours already has this).

Sorry I wasn't aware of this fix and the backport is not in our source.
Thanks.

Dietmar.

> 
> Jan

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