Messages in this thread | | | Date | Mon, 07 Apr 2014 15:40:46 -0400 | From | Sasha Levin <> | Subject | Re: mm: BUG in do_huge_pmd_wp_page |
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It also breaks fairly quickly under testing because:
On 04/07/2014 10:48 AM, Kirill A. Shutemov wrote: > + if (IS_ENABLED(CONFIG_DEBUG_PAGEALLOC)) { > + spin_lock(ptl);
^ We go into atomic
> + if (unlikely(!pmd_same(*pmd, orig_pmd))) > + goto out_race; > + } > + > if (!page) > clear_huge_page(new_page, haddr, HPAGE_PMD_NR); > else > copy_user_huge_page(new_page, page, haddr, vma, HPAGE_PMD_NR);
copy_user_huge_page() doesn't like running in atomic state, and asserts might_sleep().
Thanks, Sasha
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