On Tue, 11 Aug 2015 18:47:57 +0800 Wanpeng Li <[email protected]> wrote:
> > ... > > Huge zero page is allocated if page fault w/o FAULT_FLAG_WRITE flag. > The get_user_pages_fast() which called in madvise_hwpoison() will get > huge zero page if the page is not allocated before. Huge zero page is > a tranparent huge page, however, it is not an anonymous page. memory_failure > will split the huge zero page and trigger BUG_ON(is_huge_zero_page(page)); > After commit (98ed2b0: mm/memory-failure: give up error handling for > non-tail-refcounted thp), memory_failure will not catch non anon thp > from madvise_hwpoison path and this bug occur. So I'm assuming this patch is needed for 4.2 but not in earlier kernels. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
