From: Mike Snitzer <snitzer@redhat.com>
To: Matthias Dahl <ml_linux-kernel@binary-island.eu>
Cc: linux-mm@kvack.org, dm-devel@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [4.7.0rc6] Page Allocation Failures with dm-crypt
Date: Mon, 11 Jul 2016 09:18:19 -0400 [thread overview]
Message-ID: <20160711131818.GA28102@redhat.com> (raw)
In-Reply-To: <e7af885e08e1ced4f75313bfdfda166d@mail.ud19.udmedia.de>
On Mon, Jul 11 2016 at 4:31am -0400,
Matthias Dahl <ml_linux-kernel@binary-island.eu> wrote:
> Hello,
>
> I made a few more tests and here my observations:
>
> - kernels 4.4.8 and 4.5.5 show the same behavior
>
> - the moment dd starts, memory usage spikes rapidly and within a just
> a few seconds has filled up all 32 GiB of RAM
>
> - dd w/ direct i/o works just fine
>
> - mkfs.ext4 unfortunately shows the same behavior as dd w/o direct i/o
> and such makes creation of an ext4 fs on dm-crypt a game of luck
>
> (much more exposed so with e2fsprogs 1.43.1)
>
> I am kind of puzzled that this bug has seemingly gone so long unnoticed
> since it is rather severe and makes dm-crypt unusable to a certain
> degree
> for fs encryption (or at least the initial creation of the fs). Am I
> missing something here or doing something terribly stupid?
Not clear. Certainly haven't had any reports of memory leaks with
dm-crypt. Something must explain the execessive nature of your leak but
it isn't a known issue.
Have you tried running with kmemleak enabled?
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2016-07-11 13:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-09 13:40 [4.7.0rc6] Page Allocation Failures with dm-crypt Matthias Dahl
2016-07-11 8:31 ` Matthias Dahl
2016-07-11 13:18 ` Mike Snitzer [this message]
2016-07-11 13:27 ` [dm-devel] " Matthias Dahl
2016-07-11 13:44 ` Mike Snitzer
2016-07-11 13:30 ` Mike Snitzer
2016-07-11 14:47 ` [dm-devel] " Matthias Dahl
2016-07-12 8:06 ` Matthias Dahl
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160711131818.GA28102@redhat.com \
--to=snitzer@redhat.com \
--cc=dm-devel@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=ml_linux-kernel@binary-island.eu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).