From unknown Fri Jun 20 20:10:57 2025 X-Loop: help-debbugs@gnu.org Subject: bug#7478: Puzzled by dd Resent-From: =?UTF-8?Q?=E5=BA=84=E9=92=A6=E5=B9=B3?= Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-To: owner@debbugs.gnu.org Resent-CC: bug-coreutils@gnu.org Resent-Date: Thu, 25 Nov 2010 04:09:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 7478 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: 7478@debbugs.gnu.org X-Debbugs-Original-To: bug-coreutils@gnu.org Received: via spool by submit@debbugs.gnu.org id=B.129065811113430 (code B ref -1); Thu, 25 Nov 2010 04:09:02 +0000 Received: (at submit) by debbugs.gnu.org; 25 Nov 2010 04:08:31 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1PLT8G-0003UW-4F for submit@debbugs.gnu.org; Wed, 24 Nov 2010 23:08:31 -0500 Received: from eggs.gnu.org ([140.186.70.92]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1PLSpC-00034u-Pw for submit@debbugs.gnu.org; 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Wed, 24 Nov 2010 22:54:02 -0500 Received: from cauccyu1980 ( [221.239.61.185] ) by ajax-webmail-wmsvr14 (Coremail) ; Thu, 25 Nov 2010 11:53:44 +0800 (CST) Date: Thu, 25 Nov 2010 11:53:44 +0800 (CST) From: =?UTF-8?Q?=E5=BA=84=E9=92=A6=E5=B9=B3?= Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_72589_667040615.1290657224571" X-Originating-IP: [221.239.61.185] X-Priority: 3 X-Mailer: Coremail Webmail Server Version SP_ntes V3.5 build 101029(12229.3533.3507) Copyright (c) 2002-2010 www.mailtech.cn 126com X-CM-CTRLDATA: hrzfN2Zvb3Rlcl9odG09NjgxOjIxNw== X-CM-TRANSID: DsqowKBrXLLJ3e1Mbz8WAA--.480W X-CM-SenderInfo: 5fdxuul1xrmmaq6rjloofrz/1tbi7xOUAkzBtC02xAACsO X-Coremail-Antispam: 1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU== X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Spam-Score: -1.7 (-) X-Mailman-Approved-At: Wed, 24 Nov 2010 23:08:27 -0500 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -2.9 (--) ------=_Part_72589_667040615.1290657224571 Content-Type: text/plain; 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boundary="----------=_1290730322-19678-1" This is a multi-part message in MIME format... ------------=_1290730322-19678-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Your bug report #7478: Puzzled by dd which was filed against the coreutils package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 7478@debbugs.gnu.org. --=20 7478: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D7478 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems ------------=_1290730322-19678-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 7478-done) by debbugs.gnu.org; 26 Nov 2010 00:11:56 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1PLluu-000579-42 for submit@debbugs.gnu.org; Thu, 25 Nov 2010 19:11:56 -0500 Received: from mail1.slb.deg.dub.stisp.net ([84.203.253.98]) by debbugs.gnu.org with smtp (Exim 4.69) (envelope-from ) id 1PLlus-00056w-EN for 7478-done@debbugs.gnu.org; Thu, 25 Nov 2010 19:11:55 -0500 Received: (qmail 49851 invoked from network); 26 Nov 2010 00:17:17 -0000 Received: from unknown (HELO ?192.168.2.25?) (84.203.137.218) by mail1.slb.deg.dub.stisp.net with SMTP; 26 Nov 2010 00:17:17 -0000 Message-ID: <4CEEFC3D.6030700@draigBrady.com> Date: Fri, 26 Nov 2010 00:15:57 +0000 From: =?x-gbk?Q?P=A8=A2draig_Brady?= User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: =?x-gbk?Q?=D7=AF=C7=D5=C6=BD?= Subject: Re: bug#7478: Puzzled by dd References: In-Reply-To: X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=x-gbk Content-Transfer-Encoding: 8bit X-Spam-Score: -2.7 (--) X-Debbugs-Envelope-To: 7478-done Cc: 7478-done@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -2.7 (--) On 25/11/10 03:53, ׯÇÕƽ wrote: > According to the partition table, the partition sda1 starts from sector 64, so the following two command lines will get same files: > 1) dd if=/dev/sda1 of=f1 bs=1M count=32 > 2) dd if=/dev/sda of=f2 bs=512 count=65536 skip=63 > It works and both of them get the same 32M raw data(md5sum f1 f2 get same checksum). But after some operations on the 32M in sda1(I'm running LVM tests, it only changes the 32M contents in the beginning of sda1, and maybe the LVM module reworked doesn't work well), it fails. Even if I dd 32M from /dev/zero(dd if=/dev/zero of=/dev/sda1 bs=1M count=32) and run above two commands, I get f1 and f2 with different checksum. WHY??? I very much doubt an issue with dd. Your commands look valid, so I'm guessing some kernel caching issue. I'd suggest doing a binary comparison of the data, rather than comparing the hashes. I'm closing this bug, and we can reopen if you do find dd to be at issue. If you still suspect dd, then we'll need version info and straces of both commands. cheers, P¨¢draig. ------------=_1290730322-19678-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at submit) by debbugs.gnu.org; 25 Nov 2010 04:08:31 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1PLT8G-0003UW-4F for submit@debbugs.gnu.org; Wed, 24 Nov 2010 23:08:31 -0500 Received: from eggs.gnu.org ([140.186.70.92]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1PLSpC-00034u-Pw for submit@debbugs.gnu.org; Wed, 24 Nov 2010 22:48:50 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PLSuN-0000ll-VQ for submit@debbugs.gnu.org; Wed, 24 Nov 2010 22:54:08 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,HTML_MESSAGE, T_RP_MATCHES_RCVD autolearn=unavailable version=3.3.1 Received: from lists.gnu.org ([199.232.76.165]:50178) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PLSuN-0000lh-TF for submit@debbugs.gnu.org; Wed, 24 Nov 2010 22:54:07 -0500 Received: from [140.186.70.92] (port=46450 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PLSuM-00061m-Sr for bug-coreutils@gnu.org; Wed, 24 Nov 2010 22:54:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PLSuI-0000ku-SQ for bug-coreutils@gnu.org; Wed, 24 Nov 2010 22:54:06 -0500 Received: from m15-14.126.com ([220.181.15.14]:41185) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PLSuG-0000dK-As for bug-coreutils@gnu.org; Wed, 24 Nov 2010 22:54:02 -0500 Received: from cauccyu1980 ( [221.239.61.185] ) by ajax-webmail-wmsvr14 (Coremail) ; Thu, 25 Nov 2010 11:53:44 +0800 (CST) Date: Thu, 25 Nov 2010 11:53:44 +0800 (CST) From: =?GBK?B?16/H1ca9?= To: bug-coreutils@gnu.org Message-ID: Subject: Puzzled by dd MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_72589_667040615.1290657224571" X-Originating-IP: [221.239.61.185] X-Priority: 3 X-Mailer: Coremail Webmail Server Version SP_ntes V3.5 build 101029(12229.3533.3507) Copyright (c) 2002-2010 www.mailtech.cn 126com X-CM-CTRLDATA: hrzfN2Zvb3Rlcl9odG09NjgxOjIxNw== X-CM-TRANSID: DsqowKBrXLLJ3e1Mbz8WAA--.480W X-CM-SenderInfo: 5fdxuul1xrmmaq6rjloofrz/1tbi7xOUAkzBtC02xAACsO X-Coremail-Antispam: 1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU== X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Spam-Score: -1.7 (-) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Wed, 24 Nov 2010 23:08:27 -0500 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -2.9 (--) ------=_Part_72589_667040615.1290657224571 Content-Type: text/plain; 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