Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1205434

Re: [PATCH] mm/hwpoison: fix panic due to split huge zero page

Show all headers | View raw

On Tue, 11 Aug 2015 18:47:57 +0800 Wanpeng Li <wanpeng.li@hotmail.com> 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 majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH] mm/hwpoison: fix panic due to split huge zero page Wanpeng Li <wanpeng.li@hotmail.com> - 2015-08-11 13:20 +0200
  Re: [PATCH] mm/hwpoison: fix panic due to split huge zero page Andrew Morton <akpm@linux-foundation.org> - 2015-08-11 23:20 +0200
    Re: [PATCH] mm/hwpoison: fix panic due to split huge zero page Wanpeng Li <wanpeng.li@hotmail.com> - 2015-08-12 00:30 +0200
  Re: [PATCH] mm/hwpoison: fix panic due to split huge zero page Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2015-08-12 11:20 +0200

csiph-web