From: Christoph Hellwig <hch@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Pavel Machek <pavel@ucw.cz>, Dave Chinner <david@fromorbit.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Jens Axboe <axboe@kernel.dk>, dave b <db.pub.mail@gmail.com>,
Sanjoy Mahajan <sanjoy@olin.edu>, Jesper Juhl <jj@chaosbits.net>,
Chris Mason <chris.mason@oracle.com>,
Pekka Enberg <penberg@kernel.org>,
Aidar Kultayev <the.aidar@gmail.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Nick Piggin <npiggin@suse.de>,
Arjan van de Ven <arjan@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>, "Ted Ts'o" <tytso@mit.edu>,
Corrado Zoccolo <czoccolo@gmail.com>,
Shaohua Li <shaohua.li@intel.com>,
Steven Barrett <damentz@gmail.com>
Subject: Re: 2.6.36 io bring the system to its knees
Date: Wed, 10 Nov 2010 09:55:11 -0500 [thread overview]
Message-ID: <20101110145511.GA22073@infradead.org> (raw)
In-Reply-To: <20101110142721.GA14496@elte.hu>
On Wed, Nov 10, 2010 at 03:27:21PM +0100, Ingo Molnar wrote:
> That is data that was freshly touched around the time the system went down, right?
>
> I.e. data that was probably half-modified by user-space to begin with.
It's data that wasn't synced out yet, yes. Which isn't the problem per
se. With ext3/4 in ordered mode, or xfs, or btrfs the file size won't
be incremented until the data is written. in ext3/4 in writeback mode
(or various non-journaling filesystems) however the inode size is
updated, and metadagta changes are logged. Besides exposing stale
data which is a security risk in multi-user systems it also means the
inode looks modified (by size and timestamps), but contains other data
than actually written.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Pavel Machek <pavel@ucw.cz>, Dave Chinner <david@fromorbit.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Jens Axboe <axboe@kernel.dk>, dave b <db.pub.mail@gmail.com>,
Sanjoy Mahajan <sanjoy@olin.edu>, Jesper Juhl <jj@chaosbits.net>,
Chris Mason <chris.mason@oracle.com>,
Pekka Enberg <penberg@kernel.org>,
Aidar Kultayev <the.aidar@gmail.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Nick Piggin <npiggin@suse.de>,
Arjan van de Ven <arjan@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>, Ted Ts'o <tytso@mit.edu>,
Corrado Zoccolo <czoccolo@gmail.com>,
Shaohua Li <shaohua.li@intel.com>,
Steven Barrett <damentz@gmail.com>
Subject: Re: 2.6.36 io bring the system to its knees
Date: Wed, 10 Nov 2010 09:55:11 -0500 [thread overview]
Message-ID: <20101110145511.GA22073@infradead.org> (raw)
In-Reply-To: <20101110142721.GA14496@elte.hu>
On Wed, Nov 10, 2010 at 03:27:21PM +0100, Ingo Molnar wrote:
> That is data that was freshly touched around the time the system went down, right?
>
> I.e. data that was probably half-modified by user-space to begin with.
It's data that wasn't synced out yet, yes. Which isn't the problem per
se. With ext3/4 in ordered mode, or xfs, or btrfs the file size won't
be incremented until the data is written. in ext3/4 in writeback mode
(or various non-journaling filesystems) however the inode size is
updated, and metadagta changes are logged. Besides exposing stale
data which is a security risk in multi-user systems it also means the
inode looks modified (by size and timestamps), but contains other data
than actually written.
--
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next prev parent reply other threads:[~2010-11-10 14:55 UTC|newest]
Thread overview: 130+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <AANLkTimt7wzR9RwGWbvhiOmot_zzayfCfSh_-v6yvuAP@mail.gmail.com>
2010-10-26 13:00 ` Fwd: 2.6.36 io bring the system to its knees Aidar Kultayev
[not found] ` <AANLkTinzJ9a+9w7G5X0uZpX2o-L8E6XW98VFKoF1R_-S@mail.gmail.com>
2010-10-28 6:09 ` Aidar Kultayev
2010-10-28 6:32 ` Pekka Enberg
2010-10-28 6:32 ` Pekka Enberg
2010-10-28 9:00 ` Ingo Molnar
2010-10-28 9:00 ` Ingo Molnar
2010-10-28 9:34 ` Pekka Enberg
2010-10-28 9:34 ` Pekka Enberg
2010-10-28 11:16 ` Pekka Enberg
2010-10-28 11:16 ` Pekka Enberg
2010-10-28 11:33 ` Aidar Kultayev
2010-10-28 11:33 ` Aidar Kultayev
2010-10-28 11:48 ` Pekka Enberg
2010-10-28 11:48 ` Pekka Enberg
2010-10-28 12:18 ` Aidar Kultayev
2010-10-28 12:18 ` Aidar Kultayev
2010-10-28 13:46 ` Christoph Hellwig
2010-10-28 13:46 ` Christoph Hellwig
2010-10-28 13:54 ` Ingo Molnar
2010-10-28 13:54 ` Ingo Molnar
2010-10-28 13:30 ` Ingo Molnar
2010-10-28 13:30 ` Ingo Molnar
2010-10-28 13:47 ` Christoph Hellwig
2010-10-28 13:47 ` Christoph Hellwig
2010-10-28 13:50 ` Ingo Molnar
2010-10-28 13:50 ` Ingo Molnar
2010-10-28 17:01 ` Chris Mason
2010-10-28 17:01 ` Chris Mason
2010-10-28 17:57 ` Pekka Enberg
2010-10-28 17:57 ` Pekka Enberg
2010-10-29 14:52 ` Ted Ts'o
2010-10-29 14:52 ` Ted Ts'o
2010-10-29 15:33 ` Aidar Kultayev
2010-10-29 15:33 ` Aidar Kultayev
2010-10-30 9:14 ` Ingo Molnar
2010-10-30 9:14 ` Ingo Molnar
2010-10-30 13:02 ` Aidar Kultayev
2010-10-30 13:02 ` Aidar Kultayev
2010-10-30 19:06 ` Chris Mason
2010-10-30 19:06 ` Chris Mason
2010-10-31 2:31 ` Ted Ts'o
2010-10-31 2:31 ` Ted Ts'o
2010-10-31 17:49 ` Corrado Zoccolo
2010-10-31 17:49 ` Corrado Zoccolo
2010-11-02 3:10 ` Shaohua Li
2010-11-02 3:10 ` Shaohua Li
2010-11-02 11:47 ` Sanjoy Mahajan
2010-11-02 11:47 ` Sanjoy Mahajan
2010-11-02 13:12 ` Chris Mason
2010-11-02 13:12 ` Chris Mason
2010-11-04 16:05 ` Sanjoy Mahajan
2010-11-04 16:05 ` Sanjoy Mahajan
2010-11-04 23:35 ` Steven Barrett
2010-11-04 23:35 ` Steven Barrett
2010-11-04 23:44 ` Jesper Juhl
2010-11-04 23:44 ` Jesper Juhl
2010-11-04 23:48 ` Jesper Juhl
2010-11-04 23:48 ` Jesper Juhl
2010-11-05 1:43 ` Dave Chinner
2010-11-05 1:43 ` Dave Chinner
2010-11-05 12:48 ` Sanjoy Mahajan
2010-11-05 12:48 ` Sanjoy Mahajan
2010-11-06 14:10 ` dave b
2010-11-06 14:10 ` dave b
2010-11-06 15:12 ` Dave Chinner
2010-11-06 15:12 ` Dave Chinner
2010-11-07 6:06 ` dave b
2010-11-07 6:06 ` dave b
2010-11-07 12:08 ` Jens Axboe
2010-11-07 12:08 ` Jens Axboe
2010-11-07 15:50 ` Linus Torvalds
2010-11-07 15:50 ` Linus Torvalds
2010-11-10 1:32 ` Dave Chinner
2010-11-10 1:32 ` Dave Chinner
2010-11-10 2:01 ` dave b
2010-11-10 2:01 ` dave b
2010-11-10 8:08 ` Evgeniy Ivanov
2010-11-10 8:08 ` Evgeniy Ivanov
2010-11-10 8:24 ` Dave Chinner
2010-11-10 8:24 ` Dave Chinner
2010-11-10 14:22 ` Pavel Machek
2010-11-10 14:22 ` Pavel Machek
2010-11-10 14:20 ` Pavel Machek
2010-11-10 14:20 ` Pavel Machek
2010-11-10 14:27 ` Ingo Molnar
2010-11-10 14:27 ` Ingo Molnar
2010-11-10 14:55 ` Christoph Hellwig [this message]
2010-11-10 14:55 ` Christoph Hellwig
2010-11-10 19:09 ` Pavel Machek
2010-11-10 19:09 ` Pavel Machek
2010-11-10 14:33 ` Theodore Tso
2010-11-10 14:33 ` Theodore Tso
2010-11-10 14:57 ` Christoph Hellwig
2010-11-10 14:57 ` Christoph Hellwig
2010-11-10 15:00 ` Chris Mason
2010-11-10 15:00 ` Chris Mason
2010-11-10 23:36 ` Dave Chinner
2010-11-10 23:36 ` Dave Chinner
2010-11-10 15:59 ` Linus Torvalds
2010-11-10 15:59 ` Linus Torvalds
2010-11-10 16:46 ` Alexey Dobriyan
2010-11-10 16:46 ` Alexey Dobriyan
2010-11-10 16:55 ` Linus Torvalds
2010-11-10 16:55 ` Linus Torvalds
2010-11-10 17:10 ` Alexey Dobriyan
2010-11-10 17:10 ` Alexey Dobriyan
2010-11-10 18:55 ` Mark Lord
2010-11-10 18:55 ` Mark Lord
2010-11-10 18:27 ` Mike Galbraith
2010-11-10 18:27 ` Mike Galbraith
2010-11-10 23:43 ` Dave Chinner
2010-11-10 23:43 ` Dave Chinner
2010-11-06 19:10 ` Arjan van de Ven
2010-11-06 19:10 ` Arjan van de Ven
2010-11-07 17:16 ` Jesper Juhl
2010-11-07 17:16 ` Jesper Juhl
2010-11-09 19:47 ` Evgeniy Ivanov
2010-11-09 19:47 ` Evgeniy Ivanov
2010-11-09 20:20 ` Christoph Hellwig
2010-11-09 20:20 ` Christoph Hellwig
2010-11-09 21:00 ` Chris Mason
2010-11-09 21:00 ` Chris Mason
2010-10-31 1:22 ` Wu Fengguang
2010-10-31 1:22 ` Wu Fengguang
2010-10-31 1:51 ` Wu Fengguang
2010-10-31 1:51 ` Wu Fengguang
2010-11-01 1:09 ` Dimitrios Apostolou
2010-11-01 1:09 ` Dimitrios Apostolou
2010-11-02 1:20 ` Wu Fengguang
2010-11-02 1:20 ` Wu Fengguang
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