From owner-freebsd-bugs@FreeBSD.ORG Sun Sep 14 10:10:19 2003 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3BBF816A5C5 for ; Sun, 14 Sep 2003 10:10:19 -0700 (PDT) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 274AD43FE5 for ; Sun, 14 Sep 2003 10:10:17 -0700 (PDT) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.12.9/8.12.9) with ESMTP id h8EHAHUp040472 for ; Sun, 14 Sep 2003 10:10:17 -0700 (PDT) (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.12.9/8.12.9/Submit) id h8EHAG3A040471; Sun, 14 Sep 2003 10:10:16 -0700 (PDT) Resent-Date: Sun, 14 Sep 2003 10:10:16 -0700 (PDT) Resent-Message-Id: <200309141710.h8EHAG3A040471@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Spartak Radchenko Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4B33C16A4BF; Sun, 14 Sep 2003 10:03:18 -0700 (PDT) Received: from corwin.aif.ru (corwin.aif.ru [212.15.98.3]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2429D43FBF; Sun, 14 Sep 2003 10:03:17 -0700 (PDT) (envelope-from spartak@corwin.aif.ru) Received: from corwin.aif.ru (localhost [127.0.0.1]) by corwin.aif.ru (8.12.9/8.12.9) with ESMTP id h8EH3FED000818; Sun, 14 Sep 2003 21:03:15 +0400 (MSD) (envelope-from spartak@corwin.aif.ru) Received: (from spartak@localhost) by corwin.aif.ru (8.12.9/8.12.9/Submit) id h8EH3EWv000817; Sun, 14 Sep 2003 21:03:14 +0400 (MSD) (envelope-from spartak) Message-Id: <200309141703.h8EH3EWv000817@corwin.aif.ru> Date: Sun, 14 Sep 2003 21:03:14 +0400 (MSD) From: Spartak Radchenko To: FreeBSD-gnats-submit@FreeBSD.org X-Send-Pr-Version: 3.113 cc: stable@FreeBSD.org cc: re@FreeBSD.org Subject: kern/56871: dd can't write variable length data blocks to SCSI DDS streamer. X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: Spartak Radchenko List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 14 Sep 2003 17:10:19 -0000 >Number: 56871 >Category: kern >Synopsis: dd can't write variable length data blocks to SCSI DDS streamer. >Confidential: no >Severity: serious >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Sep 14 10:10:16 PDT 2003 >Closed-Date: >Last-Modified: >Originator: Spartak Radchenko >Release: FreeBSD 4.9-PRERELEASE i386 >Organization: Arguments & Facts Weekly >Environment: System: FreeBSD corwin.aif.ru 4.9-PRERELEASE FreeBSD 4.9-PRERELEASE #0: Sun Sep 14 18:44:54 MSD 2003 spartak@corwin.aif.ru:/usr/obj/usr/src/sys/corwin i386 >Description: dd can't write the last short data block to SCSI DDS streamer. Moreover, it can't write variable length records, only in multiples of 1024. This problem was introduced in RELENG_4 between Aug 14 and Sep 10 2003. >How-To-Repeat: corwin# dd if=/dev/zero ibs=1024 count=1 obs=1024 of=/dev/sa0 1+0 records in 1+0 records out 1024 bytes transferred in 0.001765 secs (580166 bytes/sec) corwin# 1024 bytes are written, all OK. corwin# dd if=/dev/zero ibs=1025 count=1 obs=1024 of=/dev/sa0 dd: /dev/sa0: Invalid argument 1+0 records in 1+0 records out 1024 bytes transferred in 0.004238 secs (241623 bytes/sec) corwin# The last byte from 1025 is lost. There is a message in /var/log/messages: Sep 14 20:39:52 corwin /kernel: (sa0:ahd1:0:0:0): Invalid request. Fixed block device requests must be a multiple of 1024 bytes >Fix: I don't know the fix for this problem. In some cases a simple workaround can be used: dd if=... of=/dev/sa0 obs=1024 conv=osync >Release-Note: >Audit-Trail: >Unformatted: