From: Sasha Levin <sasha.levin@oracle.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>,
Hugh Dickins <hughd@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
David Rientjes <rientjes@google.com>,
Andrea Arcangeli <aarcange@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>, Mel Gorman <mgorman@suse.de>,
Dave Jones <davej@redhat.com>, linux-mm <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: mm: BUG in do_huge_pmd_wp_page
Date: Mon, 07 Apr 2014 15:40:46 -0400 [thread overview]
Message-ID: <5342FF3E.6030306@oracle.com> (raw)
In-Reply-To: <20140407144835.GA17774@node.dhcp.inet.fi>
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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next prev parent reply other threads:[~2014-04-07 19:48 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-29 13:04 mm: BUG in do_huge_pmd_wp_page Sasha Levin
2013-04-04 14:03 ` Sasha Levin
2013-04-04 14:30 ` Kirill A. Shutemov
2013-04-04 14:37 ` Sasha Levin
2013-04-04 16:28 ` Kirill A. Shutemov
2013-04-04 21:54 ` Sasha Levin
2014-04-04 19:37 ` Sasha Levin
2014-04-07 14:48 ` Kirill A. Shutemov
2014-04-07 14:56 ` Sasha Levin
2014-04-07 19:40 ` Sasha Levin [this message]
2014-04-07 20:11 ` Kirill A. Shutemov
2014-05-15 17:31 ` Sasha Levin
2014-05-15 17:37 ` Hugh Dickins
2014-05-15 17:43 ` Sasha Levin
2014-05-15 17:58 ` Hugh Dickins
2013-04-10 8:02 ` Minchan Kim
2013-04-11 13:18 ` Kirill A. Shutemov
2013-04-14 7:13 ` Minchan Kim
2013-04-11 14:55 ` Sasha Levin
2013-04-11 15:13 ` Kirill A. Shutemov
2013-04-11 15:14 ` Sasha Levin
2013-04-24 22:46 ` Andrew Morton
2013-04-26 0:51 ` Sasha Levin
2013-04-26 2:01 ` Dave Jones
2013-04-26 3:12 ` Sasha Levin
2014-02-04 3:01 ` Sasha Levin
2014-02-04 3:59 ` Hugh Dickins
2014-02-04 16:58 ` Kirill A. Shutemov
2014-02-05 18:12 ` Sasha Levin
2014-02-05 22:50 ` Hugh Dickins
2013-04-24 22:51 ` H. Peter Anvin
2013-04-24 23:40 ` Simon Jeons
2013-04-26 2:28 ` H. Peter Anvin
2013-04-26 1:30 ` Minchan Kim
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