Re: [Xen-devel] (XEN) Xen BUG at page_alloc.c:385

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>]

Am 19.10.2010 schrieb "Jan Beulich <JBeulich@xxxxxxxxxx>":

> >>> On 19.10.10 at 14:16, Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx> 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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