From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 06896C282C3 for ; Tue, 22 Jan 2019 19:08:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CCB8520870 for ; Tue, 22 Jan 2019 19:08:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="DvqJwek0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726130AbfAVTIV (ORCPT ); Tue, 22 Jan 2019 14:08:21 -0500 Received: from mail-lj1-f193.google.com ([209.85.208.193]:35815 "EHLO mail-lj1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726109AbfAVTIV (ORCPT ); Tue, 22 Jan 2019 14:08:21 -0500 Received: by mail-lj1-f193.google.com with SMTP id x85-v6so21684905ljb.2 for ; Tue, 22 Jan 2019 11:08:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=RmYlTpQ95R/cSsmQUKU8G4lAg2996kafwYSWFGCYB94=; b=DvqJwek0LS6mkFBqisc3vNmCDLvahOIaC5D0V7G1gZuYAquOReP5lTa5XQHZenx8pX YletYr17Q+DmxP/j/eJjuovogcI4xqZpmv8oDxFddF5WTHugKUPudlHMr7G87fcKYSO7 IZNbeskETUxTRHrfI/0cuQj79oelSE1fmrZ2E= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=RmYlTpQ95R/cSsmQUKU8G4lAg2996kafwYSWFGCYB94=; b=g3y0L+Inf6tpvxCkOPPFRTc5jLT+mPgAvc/SnUnS/WcONRKKhnPvedseQerBIS+SLB GeZ6zZowJ37oAaxxy6+AnkGWwvXQEWh5BdSLmY1zzL8MD1bW2YgbDbL69QQ3rWU2a4F2 eMRIy3L2AjAyhcSFSYwpSJ7rqfn6fUvdVlDJ9QbFodUq/msIzTvOVomPwLz5S07OSzUg nnXzGPnb6PdVA8eMndiRKazyOl8OSZ8EY+kPygnbGobOVoqXzmGsu5wolsMS0MHpICzM HWpsMDouBELFqbkQkUg6yICUC8gFB4pPu4wzVuvN2hS2WacGf7+MyJlEChwcUI8M1xRI yUdw== X-Gm-Message-State: AJcUukfOiTndOr4LqFA6DkEY4WfQNfJgrTHVIiUD6sbNDdFtzs8plw03 lDKtz2RVgEqZ2YbY4v1Kcx6+RcNGUQs= X-Google-Smtp-Source: ALg8bN6L3ysW54BjWWV0ZArFtkEr3WFjPToSUG3YOydNd4tRYCioxMbQuyPlIoEUs+ZU+5BygTE3LQ== X-Received: by 2002:a2e:8945:: with SMTP id b5-v6mr3607634ljk.55.1548184098571; Tue, 22 Jan 2019 11:08:18 -0800 (PST) Received: from mail-lf1-f50.google.com (mail-lf1-f50.google.com. [209.85.167.50]) by smtp.gmail.com with ESMTPSA id x24-v6sm146420ljc.54.2019.01.22.11.08.17 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 22 Jan 2019 11:08:17 -0800 (PST) Received: by mail-lf1-f50.google.com with SMTP id i26so18956897lfc.0 for ; Tue, 22 Jan 2019 11:08:17 -0800 (PST) X-Received: by 2002:a19:7352:: with SMTP id o79mr22814922lfc.104.1548184097075; Tue, 22 Jan 2019 11:08:17 -0800 (PST) MIME-Version: 1.0 References: <398a6e83-d482-6e72-5806-6d5bbe8bfdd9@oracle.com> <20190119095601.GA7440@infradead.org> <07b2df5d-e1fe-9523-7c11-f3058a966f8a@free.fr> <985b340c-623f-6df2-66bd-d9f4003189ea@free.fr> <20190122162246.GA22548@kroah.com> In-Reply-To: <20190122162246.GA22548@kroah.com> From: Evan Green Date: Tue, 22 Jan 2019 11:07:40 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: dd hangs when reading large partitions To: Greg Kroah-Hartman Cc: Marc Gonzalez , Jianchao Wang , Christoph Hellwig , Jens Axboe , fsdevel , linux-block , SCSI , Joao Pinto , Subhash Jadavani , Sayali Lokhande , Can Guo , Asutosh Das , Vijay Viswanath , Venkat Gopalakrishnan , Ritesh Harjani , Vivek Gautam , Jeffrey Hugo , Maya Erez , Matthias Kaehlcke , Douglas Anderson , Stephen Boyd , Tomas Winkler , Adrian Hunter , Alim Akhtar , Avri Altman , Bart Van Assche , Martin Petersen , Bjorn Andersson Content-Type: text/plain; charset="UTF-8" Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org FWIW, I am unable to repro this in our 4.19 kernel [1]. I put mem=4G on the command line, and can dd till the cows come home. Seems like you're leaking buffers somewhere? localhost ~ # dd if=/dev/sda of=/dev/null bs=4M status=progress 12683575296 bytes (13 GB, 12 GiB) copied, 125.004 s, 101 MB/s^C 3048+0 records in 3047+0 records out 12780044288 bytes (13 GB, 12 GiB) copied, 126.015 s, 101 MB/s -Evan [1] https://chromium.googlesource.com/chromiumos/third_party/kernel/+/chromeos-4.19