Date: Thu, 12 Feb 2004 00:40:08 GMT From: abc@ai1.anchorage.mtaonline.net To: FreeBSD-gnats-submit@FreeBSD.org Subject: i386/62717: ATA or similar read bug. Message-ID: <200402120040.i1C0e8Vn032324@en26.ai1.anchorage.mtaonline.net> Resent-Message-ID: <200402120040.i1C0e8SO065313@freefall.freebsd.org>
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>Number: 62717
>Category: i386
>Synopsis: ATA or similar read bug.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-i386
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Feb 11 16:40:08 PST 2004
>Closed-Date:
>Last-Modified:
>Originator: Joe Public
>Release: i386 FreeBSD 4.9-RELEASE
>Organization:
no org
>Environment:
FreeBSD 4.9-RELEASE FreeBSD 4.9-RELEASE #0: Tue Nov 25 19:10:45 AKST 2003 /usr/src/sys/compile/MYKERN i386
>Description:
when reading a large file (a gigabyte image of a hard drive
creating with strings(1)) using a simple shell loop such as
'while [ 1 ]; do read a; echo $a; done < big-file',
once every few 1000 lines, a directory listing (ls) of
the current directory is echoed in the midst of the data.
no pattern is detected - but it seems to occur more often
after 40,000 lines or so have been read.
this seems like a potentially very dangerous bug.
this is an example of the output (with a line number):
00070805: v+ file1 file2 file3 file4 file5 file6 file7
^^ the listing seems to occur after short reads.
00078682: jT| file1 file2 file3 file4 file5 file6 file7
^^^
00078701: file1 file2 file3 file4 file5 file6 file7 ]0
the carets denote actual data ^^
00079300: >u file4 file5
^^ occasionally a deficient ls listing is output.
>How-To-Repeat:
possibly create a large file as data for the loop given.
possibly a Promise Ultra100 ATA card is required.
>Fix:
don't know - this would be very time consuming to debug.
>Release-Note:
>Audit-Trail:
>Unformatted:
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