Re: [PATCH] hwpoison: fix oops on ksm pages

[Hugh Dickins]

On Tue, 13 Oct 2009, Andi Kleen wrote:
> On Tue, Oct 13, 2009 at 03:02:11PM +0100, Hugh Dickins wrote:
> > Memory failure on a KSM page currently oopses on its NULL anon_vma in
> > page_lock_anon_vma(): that may not be much worse than the consequence
> > of ignoring it, but it is better to be consistent with how ZERO_PAGE
> > and hugetlb pages and other awkward cases are treated.  Just skip it.
> 
> Thanks, Hugh. I'm curious: did this come out of code review or
> did you actually run into that?

Just out of code review: well, that's too fancy a name for it, I merely
remembered that I hadn't looked at ksm/hwpoison interoperabilty, so did
so just now.  After looking at the code, I did then try MADV_HWPOISON on
a MADV_MERGEABLE area, to check that the problem and the fix were real.

Hugh
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/