From: Andrew Morton <akpm@linux-foundation.org>
To: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Subject: Re: [PATCH] mm/hwpoison: fix panic due to split huge zero page
Date: Tue, 11 Aug 2015 14:14:04 -0700 [thread overview]
Message-ID: <20150811141404.ecb19c1a66c32abf60d6663c@linux-foundation.org> (raw)
In-Reply-To: <BLU437-SMTP5348473FAB81C31638A9A0807F0@phx.gbl>
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, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2015-08-11 21:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-11 10:47 Wanpeng Li
2015-08-11 21:14 ` Andrew Morton [this message]
2015-08-11 22:20 ` Wanpeng Li
2015-08-12 9:16 ` Naoya Horiguchi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20150811141404.ecb19c1a66c32abf60d6663c@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=n-horiguchi@ah.jp.nec.com \
--cc=wanpeng.li@hotmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox