Messages in this thread | | | Subject | Re: [mm 4.15-rc8] Random oopses under memory pressure. | From | Dave Hansen <> | Date | Wed, 17 Jan 2018 14:00:54 -0800 |
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On 01/17/2018 01:39 PM, Linus Torvalds wrote: > > So maybe something like this to test the theory? > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 76c9688b6a0a..f919a5548943 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -756,6 +756,8 @@ static inline void rmv_page_order(struct page *page) > static inline int page_is_buddy(struct page *page, struct page *buddy, > unsigned int order) > { > + if (WARN_ON_ONCE(page_zone(page) != page_zone(buddy))) > + return 0; > if (page_is_guard(buddy) && page_order(buddy) == order) { > if (page_zone_id(page) != page_zone_id(buddy)) > return 0;
I thought that page_zone_id() stuff was there to prevent this kind of cross-zone stuff from happening.
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