From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933675AbcGKIb1 (ORCPT ); Mon, 11 Jul 2016 04:31:27 -0400 Received: from ud19.udmedia.de ([194.117.254.59]:41363 "EHLO mail.ud19.udmedia.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751743AbcGKIbZ (ORCPT ); Mon, 11 Jul 2016 04:31:25 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Mon, 11 Jul 2016 10:31:22 +0200 From: Matthias Dahl To: linux-mm@kvack.org Cc: dm-devel@redhat.com, linux-kernel@vger.kernel.org Subject: Re: [4.7.0rc6] Page Allocation Failures with dm-crypt In-Reply-To: <28dc911645dce0b5741c369dd7650099@mail.ud19.udmedia.de> References: <28dc911645dce0b5741c369dd7650099@mail.ud19.udmedia.de> Message-ID: User-Agent: Roundcube Webmail/1.2.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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? With Kind Regards from Germany Matthias -- Dipl.-Inf. (FH) Matthias Dahl | Software Engineer | binary-island.eu services: custom software [desktop, mobile, web], server administration