Hi all,
On Tue, 25 Aug 2020 13:03:53 +0530 Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> wrote:
>
> On Mon, 24 Aug 2020 at 16:36, Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
> >
> > On Mon, Aug 24, 2020 at 03:14:55PM +0530, Naresh Kamboju wrote:
> > > [ 67.545247] BUG: Bad page state in process true pfn:a8fed
> > > [ 67.550767] page:9640c0ab refcount:0 mapcount:-1024
> >
> > Somebody freed a page table without calling __ClearPageTable() on it.
>
> After running git bisect on this problem,
> The first suspecting of this problem on arm architecture this patch.
> 424efe723f7717430bec7c93b4d28bba73e31cf6
> ("mm: account PMD tables like PTE tables ")
>
> Reported-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>
> Reported-by: Anders Roxell <anders.roxell@xxxxxxxxxx>
>
> Additional information:
> We have tested linux next by reverting this patch and confirmed
> that the reported BUG is not reproduced.
>
> These configs enabled on the running device,
>
> CONFIG_TRANSPARENT_HUGEPAGE=y
> CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y
>
>
> -- Suspecting patch --
> commit 424efe723f7717430bec7c93b4d28bba73e31cf6
> Author: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Date: Thu Aug 20 10:01:30 2020 +1000
>
> mm: account PMD tables like PTE tables
OK, I have reverted that patch from todays' linux-next.
--
Cheers,
Stephen Rothwell
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