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From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	"hannes@cmpxchg.org" <hannes@cmpxchg.org>
Subject: Re: [mmotm] BUG: Bad page state in process khugepaged ?
Date: Wed, 9 Feb 2011 15:52:46 +0900	[thread overview]
Message-ID: <20110209155246.69a7f3a1.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <20110209155001.0e369475.nishimura@mxp.nes.nec.co.jp>

On Wed, 9 Feb 2011 15:50:01 +0900
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote:

> > 
> > In hex, pc->flags was 7A00000000004 and this means PCG_USED bit is set.
> > This implies page_remove_rmap() may not be called but ->mapping is NULL. Hmm?
> > (7A is encoding of section number.)
> > 
> Sigh.. it seems another freed-but-not-uncharged problem..
> 

Ah, ok, this is maybe caused by this. I'm sorry that I missed this.
==
static inline int free_pages_check(struct page *page)
{
        if (unlikely(page_mapcount(page) |
                (page->mapping != NULL)  |
                (atomic_read(&page->_count) != 0) |
                (page->flags & PAGE_FLAGS_CHECK_AT_FREE) |
                (mem_cgroup_bad_page_check(page)))) {    <==========(*)
                bad_page(page);
                return 1;
==

Then, ok, this is a memcgroup and hugepage issue.

I'll look into.

Thanks,
-Kame


  reply	other threads:[~2011-02-09  6:58 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-09  6:10 KAMEZAWA Hiroyuki
2011-02-09  6:40 ` KAMEZAWA Hiroyuki
2011-02-09  6:50 ` Daisuke Nishimura
2011-02-09  6:52   ` KAMEZAWA Hiroyuki [this message]
2011-02-09 20:07     ` Andrea Arcangeli
2011-02-11  7:02       ` Hugh Dickins
2011-02-11 10:49         ` Andrea Arcangeli
2011-02-11 19:58           ` Hugh Dickins
2011-02-11 20:24             ` Andrea Arcangeli
2011-02-14 22:24           ` Johannes Weiner
2011-02-09  7:23 ` [PATCH][BUGFIX] memcg: fix leak of accounting at failure path of hugepage collapsing KAMEZAWA Hiroyuki
2011-02-09  7:51   ` Daisuke Nishimura
2011-02-09  9:51   ` Johannes Weiner
2011-02-10  2:49   ` Minchan Kim

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