Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758616AbXJNT0i (ORCPT ); Sun, 14 Oct 2007 15:26:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753762AbXJNT0a (ORCPT ); Sun, 14 Oct 2007 15:26:30 -0400 Received: from smtp2.linux-foundation.org ([207.189.120.14]:47893 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753977AbXJNT03 (ORCPT ); Sun, 14 Oct 2007 15:26:29 -0400 Date: Sun, 14 Oct 2007 12:26:13 -0700 From: Andrew Morton To: "Torsten Kaiser" Cc: linux-kernel@vger.kernel.org, Milan Broz , Alasdair G Kergon , dm-devel@redhat.com Subject: Re: 2.6.23-mm1 Message-Id: <20071014122613.5bbe4fc3.akpm@linux-foundation.org> In-Reply-To: <64bb37e0710141212k58c5fc66s620d1f28e80bb40@mail.gmail.com> References: <20071011213126.cf92efb7.akpm@linux-foundation.org> <4710B7C5.5050403@garzik.org> <64bb37e0710130732p303547e3n54cfa9dac34c53b5@mail.gmail.com> <64bb37e0710130740u78613f83wbd4f43d073bbe13d@mail.gmail.com> <64bb37e0710130813le68c48dve36f8473b197b84b@mail.gmail.com> <47110500.8050503@garzik.org> <64bb37e0710131105m7c64fca0kb71f3955170e8bec@mail.gmail.com> <20071013111853.7e67c6c3.akpm@linux-foundation.org> <64bb37e0710140454s61325fdfya43179b14ea26dc4@mail.gmail.com> <20071014113914.7654759d.akpm@linux-foundation.org> <64bb37e0710141212k58c5fc66s620d1f28e80bb40@mail.gmail.com> X-Mailer: Sylpheed 2.4.1 (GTK+ 2.8.17; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2601 Lines: 62 On Sun, 14 Oct 2007 21:12:08 +0200 "Torsten Kaiser" wrote: > On 10/14/07, Andrew Morton wrote: > > On Sun, 14 Oct 2007 13:54:26 +0200 "Torsten Kaiser" wrote: > > > > > > The page-owner code can pinpoint a leak source. See > > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23/2.6.23-mm1/broken-out/page-owner-tracking-leak-detector.patch > > > > > > > > Enable CONFIG_DEBUG_SLAB_LEAK, check out /proc/slab_allocators > > > > > > Did that. The output of /proc/page_owner is ~350Mb, gzipped still ~7Mb. > > > > > > Taking only the first line from each stackdump it shows the following counts: > > > > > > ... > > > > > > 354042 [0xffffffff80266373] mempool_alloc+83 > > > > This one is suspicious. Can you find the whole record for it? > > I still have all 354042 records of it. ;) > The first column is the times I found this line in page_owner. err, take another look at the changelog in page-owner-tracking-leak-detector.patch. It directs you to Documentation/page_owner.c which aggregates the contents of /proc/page_owner. > I divided the counts for the duplicate lines (mempool_alloc+83 and > kcryptd_do_crypt+0) by two, so normalize them. There still are some > false positive counts in there, so it does not match the 354042 > precisely. > > 354036 Page allocated via order 0, mask 0x11202 > 1 (PFN/Block always differ) PFN 3072 Block 6 type 0 Flags > 354338 [0xffffffff80266373] mempool_alloc+83 > 354338 [0xffffffff80266373] mempool_alloc+83 > 354025 [0xffffffff802bb389] bio_alloc_bioset+185 > 354058 [0xffffffff804d2b40] kcryptd_do_crypt+0 > 354052 [0xffffffff804d2cc7] kcryptd_do_crypt+391 > 354058 [0xffffffff804d2b40] kcryptd_do_crypt+0 > 354052 [0xffffffff80245d3c] run_workqueue+204 > 354062 [0xffffffff802467b0] worker_thread+0 > > I'm using dm-crypt with CONFIG_CRYPTO_TWOFISH_X86_64 > > > The other info shows a tremendous memory leak, not via slab. Looks like > > someone is running alloc_pages() directly and isnb't giving them back. > > Blaming it on dm-crypt looks right, as the leak seems to happens, if > there is (heavy) disk activity. > (updatedb just ate ~500 Mb) > Yup, it does appear that dm-crypt is leaking. Let's add some cc's. Thanks for testing -mm and for reporting this. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/