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From: Martin Wilck <mwilck@suse.com>
To: Jens Axboe <axboe@kernel.dk>, Ming Lei <tom.leiming@gmail.com>,
	Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>
Subject: Re: Silent data corruption in blkdev_direct_IO()
Date: Sat, 14 Jul 2018 00:29:46 +0200	[thread overview]
Message-ID: <f6f3f16b66622a9b16acd0d8be7ef311e4da807a.camel@suse.com> (raw)
In-Reply-To: <c5073ab4-6b06-16bd-f358-d4c18e18b3e0@kernel.dk>

Hi Ming & Jens,

On Fri, 2018-07-13 at 12:54 -0600, Jens Axboe wrote:
> On 7/12/18 5:29 PM, Ming Lei wrote:
> > 
> > Maybe you can try the following patch from Christoph to see if it
> > makes a
> > difference:
> > 
> > https://marc.info/?l=linux-kernel&m=153013977816825&w=2
> 
> That's not a bad idea.

Are you saying that the previous "nasty hack"  in
bio_iov_iter_get_pages() was broken, and the new one is not?
I've scratched my head over that (old) code lately, but I couldn't spot
an actual error in it.

Unfortunately we can only do one test at a time. We're currently trying
to find out more about the IO sizes at which the problem occurs. As you
noted, currently we know no more than that it happens somewhere between
16k and 1M.

Martin

-- 
Dr. Martin Wilck <mwilck@suse.com>, Tel. +49 (0)911 74053 2107
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)

  reply	other threads:[~2018-07-13 22:29 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-12 14:36 Silent data corruption in blkdev_direct_IO() Hannes Reinecke
2018-07-12 15:08 ` Jens Axboe
2018-07-12 16:11   ` Martin Wilck
2018-07-12 16:14   ` Hannes Reinecke
2018-07-12 16:20     ` Jens Axboe
2018-07-12 16:42       ` Jens Axboe
2018-07-13  6:47         ` Martin Wilck
2018-07-13 16:56         ` Martin Wilck
2018-07-13 18:00           ` Jens Axboe
2018-07-13 18:50             ` Jens Axboe
2018-07-13 22:21               ` Martin Wilck
2018-07-13 20:48             ` Martin Wilck
2018-07-13 20:52               ` Jens Axboe
2018-07-16 19:05                 ` Martin Wilck
2018-07-12 23:29 ` Ming Lei
2018-07-13 18:54   ` Jens Axboe
2018-07-13 22:29     ` Martin Wilck [this message]
2018-07-16 11:45       ` Ming Lei
2018-07-18  0:07         ` Martin Wilck
2018-07-18  2:48           ` Ming Lei
2018-07-18  7:32             ` Martin Wilck
2018-07-18  7:54               ` Ming Lei
2018-07-18  9:20                 ` Johannes Thumshirn
2018-07-18 11:40                   ` Jan Kara
2018-07-18 11:57                     ` Jan Kara
2018-07-19  9:39                 ` [PATCH 0/2] Fix silent " Martin Wilck
2018-07-19  9:39                   ` [PATCH 1/2] block: bio_iov_iter_get_pages: fix size of last iovec Martin Wilck
2018-07-19 10:05                     ` Hannes Reinecke
2018-07-19 10:09                     ` Ming Lei
2018-07-19 10:20                     ` Jan Kara
2018-07-19 14:52                     ` Christoph Hellwig
2018-07-19  9:39                   ` [PATCH 2/2] blkdev: __blkdev_direct_IO_simple: make sure to fill up the bio Martin Wilck
2018-07-19 10:06                     ` Hannes Reinecke
2018-07-19 10:21                     ` Ming Lei
2018-07-19 10:37                       ` Jan Kara
2018-07-19 10:46                         ` Ming Lei
2018-07-19 11:08                         ` Al Viro
2018-07-19 14:53                           ` Christoph Hellwig
2018-07-19 15:06                             ` Jan Kara
2018-07-19 15:11                               ` Christoph Hellwig
2018-07-19 19:21                                 ` Martin Wilck
2018-07-19 19:34                             ` Martin Wilck
2018-07-19 10:45                     ` Jan Kara
2018-07-19 12:23                       ` Martin Wilck
2018-07-19 15:15                         ` Jan Kara
2018-07-19 20:01                           ` Martin Wilck
2018-07-19 11:04                     ` Ming Lei
2018-07-19 11:56                       ` Jan Kara
2018-07-19 12:20                         ` Ming Lei
2018-07-19 15:21                           ` Jan Kara
2018-07-19 19:06                             ` Martin Wilck
2018-07-19 12:25                         ` Martin Wilck
2018-07-19 10:08                   ` [PATCH 0/2] Fix silent data corruption in blkdev_direct_IO() Hannes Reinecke
2018-07-19 14:50                   ` Christoph Hellwig

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