Date: Sat, 23 Jan 2010 14:46:20 GMT From: Andrey Russev <ruan@mail.univ.kiev.ua> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/143126: [ata] Data loss on read timeout Message-ID: <201001231446.o0NEkKAS053927@www.freebsd.org> Resent-Message-ID: <201001231450.o0NEo1fZ054379@freefall.freebsd.org>
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>Number: 143126 >Category: kern >Synopsis: [ata] Data loss on read timeout >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sat Jan 23 14:50:01 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Andrey Russev >Release: 8.0 >Organization: >Environment: FreeBSD mizar 8.0-RELEASE FreeBSD 8.0-RELEASE #1: Sun Nov 29 02:44:55 EET 2009 root@mizar:/usr/src/sys/i386/compile/MIZAR i386 >Description: Sometimes (possibly on heavy loads of disk) kernel prints messages like: ad6: TIMEOUT - READ_DMA48 retrying (1 retry left) LBA=615699968 These messages appear while copy/move of large file in progress. Such timeouts do not interrupt commands and they finish _without_ errors. In case mentioned above I figured out that data from previous 64k block (LBA=615699968-128) was damaged (first ~30% bytes are correct). Second copy command (after unmount/mount) makes exact copy of data. >How-To-Repeat: I don't know. It occurs at random intervals. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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