From: Mel Gorman <mgorman@suse.de>
To: Larry Woodman <lwoodman@redhat.com>
Cc: Rik van Riel <riel@redhat.com>, Hugh Dickins <hughd@google.com>,
Michal Hocko <mhocko@suse.cz>, Linux-MM <linux-mm@kvack.org>,
David Gibson <david@gibson.dropbear.id.au>,
Ken Chen <kenchen@google.com>,
Cong Wang <xiyou.wangcong@gmail.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -alternative] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables V2 (resend)
Date: Tue, 31 Jul 2012 14:29:11 +0100 [thread overview]
Message-ID: <20120731132911.GP612@suse.de> (raw)
In-Reply-To: <5017D882.6040007@redhat.com>
On Tue, Jul 31, 2012 at 09:07:14AM -0400, Larry Woodman wrote:
> On 07/31/2012 08:46 AM, Mel Gorman wrote:
> >On Mon, Jul 30, 2012 at 03:11:27PM -0400, Larry Woodman wrote:
> >>><SNIP>
> >>>That is a surprise. Can you try your test case on 3.4 and tell us if the
> >>>patch fixes the problem there? I would like to rule out the possibility
> >>>that the locking rules are slightly different in RHEL. If it hits on 3.4
> >>>then it's also possible you are seeing a different bug, more on this later.
> >>>
> >>Sorry for the delay Mel, here is the BUG() traceback from the 3.4
> >>kernel with your
> >>patches:
> >>
> >>--------------------------------------------------------------------------------------------------------------------------------------------
> >>[ 1106.156569] ------------[ cut here ]------------
> >>[ 1106.161731] kernel BUG at mm/filemap.c:135!
> >>[ 1106.166395] invalid opcode: 0000 [#1] SMP
> >>[ 1106.170975] CPU 22
> >>[ 1106.173115] Modules linked in: bridge stp llc sunrpc binfmt_misc
> >>dcdbas microcode pcspkr acpi_pad acpi]
> >>[ 1106.201770]
> >Thanks, looks very similar.
> >
> >>[ 1106.203426] Pid: 18001, comm: mpitest Tainted: G W
> >>3.3.0+ #4 Dell Inc. PowerEdge R620/07NDJ2
> >You say this was a 3.4 kernel but the message says 3.3. Probably not
> >relevant, just interesting.
> >
> Oh, sorry I posted the wrong traceback. I tested both 3.3 & 3.4 and
> had the same results.
> I'll do it again and post the 3.4 traceback for you,
It'll probably be the same. The likelhood is that the bug is really old and
did not change between 3.3 and 3.4. I mentioned it in case you accidentally
tested with an old kernel that was not patched or patched with something
different. I considered this to be very unlikely though and you already
said that RHEL was affected so it's probably the same bug seen in all
three.
--
Mel Gorman
SUSE Labs
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WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mgorman@suse.de>
To: Larry Woodman <lwoodman@redhat.com>
Cc: Rik van Riel <riel@redhat.com>, Hugh Dickins <hughd@google.com>,
Michal Hocko <mhocko@suse.cz>, Linux-MM <linux-mm@kvack.org>,
David Gibson <david@gibson.dropbear.id.au>,
Ken Chen <kenchen@google.com>,
Cong Wang <xiyou.wangcong@gmail.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -alternative] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables V2 (resend)
Date: Tue, 31 Jul 2012 14:29:11 +0100 [thread overview]
Message-ID: <20120731132911.GP612@suse.de> (raw)
In-Reply-To: <5017D882.6040007@redhat.com>
On Tue, Jul 31, 2012 at 09:07:14AM -0400, Larry Woodman wrote:
> On 07/31/2012 08:46 AM, Mel Gorman wrote:
> >On Mon, Jul 30, 2012 at 03:11:27PM -0400, Larry Woodman wrote:
> >>><SNIP>
> >>>That is a surprise. Can you try your test case on 3.4 and tell us if the
> >>>patch fixes the problem there? I would like to rule out the possibility
> >>>that the locking rules are slightly different in RHEL. If it hits on 3.4
> >>>then it's also possible you are seeing a different bug, more on this later.
> >>>
> >>Sorry for the delay Mel, here is the BUG() traceback from the 3.4
> >>kernel with your
> >>patches:
> >>
> >>--------------------------------------------------------------------------------------------------------------------------------------------
> >>[ 1106.156569] ------------[ cut here ]------------
> >>[ 1106.161731] kernel BUG at mm/filemap.c:135!
> >>[ 1106.166395] invalid opcode: 0000 [#1] SMP
> >>[ 1106.170975] CPU 22
> >>[ 1106.173115] Modules linked in: bridge stp llc sunrpc binfmt_misc
> >>dcdbas microcode pcspkr acpi_pad acpi]
> >>[ 1106.201770]
> >Thanks, looks very similar.
> >
> >>[ 1106.203426] Pid: 18001, comm: mpitest Tainted: G W
> >>3.3.0+ #4 Dell Inc. PowerEdge R620/07NDJ2
> >You say this was a 3.4 kernel but the message says 3.3. Probably not
> >relevant, just interesting.
> >
> Oh, sorry I posted the wrong traceback. I tested both 3.3 & 3.4 and
> had the same results.
> I'll do it again and post the 3.4 traceback for you,
It'll probably be the same. The likelhood is that the bug is really old and
did not change between 3.3 and 3.4. I mentioned it in case you accidentally
tested with an old kernel that was not patched or patched with something
different. I considered this to be very unlikely though and you already
said that RHEL was affected so it's probably the same bug seen in all
three.
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2012-07-31 13:29 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-20 13:49 [PATCH] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables v2 Mel Gorman
2012-07-20 13:49 ` Mel Gorman
2012-07-20 14:11 ` [PATCH] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables V2 (resend) Mel Gorman
2012-07-20 14:11 ` Mel Gorman
2012-07-20 14:29 ` Michal Hocko
2012-07-20 14:29 ` Michal Hocko
2012-07-20 14:37 ` Mel Gorman
2012-07-20 14:37 ` Mel Gorman
2012-07-20 14:40 ` Michal Hocko
2012-07-20 14:40 ` Michal Hocko
2012-07-20 14:36 ` [PATCH -alternative] " Michal Hocko
2012-07-20 14:36 ` Michal Hocko
2012-07-20 14:51 ` Mel Gorman
2012-07-20 14:51 ` Mel Gorman
2012-07-23 4:04 ` Hugh Dickins
2012-07-23 4:04 ` Hugh Dickins
2012-07-23 11:40 ` Mel Gorman
2012-07-23 11:40 ` Mel Gorman
2012-07-24 1:08 ` Hugh Dickins
2012-07-24 1:08 ` Hugh Dickins
2012-07-24 8:32 ` Michal Hocko
2012-07-24 8:32 ` Michal Hocko
2012-07-24 9:34 ` Mel Gorman
2012-07-24 9:34 ` Mel Gorman
2012-07-24 10:04 ` Michal Hocko
2012-07-24 10:04 ` Michal Hocko
2012-07-24 19:23 ` Hugh Dickins
2012-07-24 19:23 ` Hugh Dickins
2012-07-25 8:36 ` Mel Gorman
2012-07-25 8:36 ` Mel Gorman
2012-07-26 17:42 ` Rik van Riel
2012-07-26 17:42 ` Rik van Riel
2012-07-26 18:04 ` Larry Woodman
2012-07-26 18:04 ` Larry Woodman
2012-07-27 8:42 ` Mel Gorman
2012-07-27 8:42 ` Mel Gorman
2012-07-26 18:37 ` Rik van Riel
2012-07-26 18:37 ` Rik van Riel
2012-07-26 21:03 ` Larry Woodman
2012-07-26 21:03 ` Larry Woodman
2012-07-27 3:48 ` Larry Woodman
2012-07-27 3:48 ` Larry Woodman
2012-07-27 10:10 ` Larry Woodman
2012-07-27 10:10 ` Larry Woodman
2012-07-27 10:23 ` Mel Gorman
2012-07-27 10:23 ` Mel Gorman
2012-07-27 10:36 ` Larry Woodman
2012-07-27 10:36 ` Larry Woodman
2012-07-30 19:11 ` Larry Woodman
2012-07-30 19:11 ` Larry Woodman
2012-07-31 12:16 ` Hillf Danton
2012-07-31 12:16 ` Hillf Danton
2012-07-31 12:46 ` Mel Gorman
2012-07-31 12:46 ` Mel Gorman
2012-07-31 13:07 ` Larry Woodman
2012-07-31 13:07 ` Larry Woodman
2012-07-31 13:29 ` Mel Gorman [this message]
2012-07-31 13:29 ` Mel Gorman
2012-07-31 13:21 ` Michal Hocko
2012-07-31 13:21 ` Michal Hocko
2012-07-31 17:49 ` Larry Woodman
2012-07-31 17:49 ` Larry Woodman
2012-07-31 20:06 ` Michal Hocko
2012-07-31 20:06 ` Michal Hocko
2012-07-31 20:57 ` Larry Woodman
2012-07-31 20:57 ` Larry Woodman
2012-08-01 2:45 ` Larry Woodman
2012-08-01 2:45 ` Larry Woodman
2012-08-01 8:20 ` Michal Hocko
2012-08-01 8:20 ` Michal Hocko
2012-08-01 12:32 ` Michal Hocko
2012-08-01 12:32 ` Michal Hocko
2012-08-01 15:06 ` Larry Woodman
2012-08-01 15:06 ` Larry Woodman
2012-08-02 7:19 ` Michal Hocko
2012-08-02 7:19 ` Michal Hocko
2012-08-02 7:37 ` Mel Gorman
2012-08-02 7:37 ` Mel Gorman
2012-08-02 12:36 ` Michal Hocko
2012-08-02 12:36 ` Michal Hocko
2012-08-02 13:33 ` Mel Gorman
2012-08-02 13:33 ` Mel Gorman
2012-08-02 13:53 ` Michal Hocko
2012-08-02 13:53 ` Michal Hocko
2012-07-31 18:03 ` Rik van Riel
2012-07-31 18:03 ` Rik van Riel
2012-07-26 18:31 ` Rik van Riel
2012-07-26 18:31 ` Rik van Riel
2012-07-27 9:02 ` Michal Hocko
2012-07-27 9:02 ` Michal Hocko
2012-07-26 16:01 ` [PATCH] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables v2 Larry Woodman
2012-07-26 16:01 ` Larry Woodman
2012-07-27 8:47 ` Mel Gorman
2012-07-27 8:47 ` Mel Gorman
2012-07-26 21:00 ` Rik van Riel
2012-07-26 21:00 ` Rik van Riel
2012-07-26 21:54 ` Hugh Dickins
2012-07-26 21:54 ` Hugh Dickins
2012-07-27 8:52 ` Mel Gorman
2012-07-27 8:52 ` Mel Gorman
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