Date: Mon, 23 Sep 2002 03:00:08 -0700 (PDT) From: Maxim Konovalov <maxim@FreeBSD.org> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/41792: lseek after ftruncate fails Message-ID: <200209231000.g8NA08UN032576@freefall.freebsd.org>
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The following reply was made to PR misc/41792; it has been noted by GNATS.
From: Maxim Konovalov <maxim@FreeBSD.org>
To: Yury Izrailevsky <izrailev@yahoo.com>
Cc: bug-followup@FreeBSD.org
Subject: Re: misc/41792: lseek after ftruncate fails
Date: Mon, 23 Sep 2002 13:59:50 +0400 (MSD)
Hello,
[...]
> >Environment:
> FreeBSD 4.6.1-RELEASE-p10
> >Description:
> File operation problem. Running the following:
>
> write(fd, buffer, 8K);
> ftruncate(fd, 0);
> write(fd, buffer, 1);
> off = lseek(fd, 0, SEEK_END);
> printf("%d", off);
>
> Output: 24576, expected: 1.
Can't reproduce on 4.6-STABLE:
$ uname -a
FreeBSD golf.macomnet.net 4.6-20020805-MACOMNET-STABLE FreeBSD
4.6-20020805-MACOMNET-STABLE #19: Fri Sep 20 17:09:52 MSD 2002
maxim@golf.macomnet.net:/usr/obj/usr/src/sys/GOLF i386
$ rm test.file
$ ./trunc
file offset=1, expected 1
$ ls -l test.file
-rw-r--r-- 1 maxim staff 1 23 ΣΕΞ 13:55 test.file
$
> The size of the actual file is 1 (if you ls -l on it). However,
> lseek goes way past it...
>
> Noticed this while running connectathon rewind test (part of special
> test suite). But fails even if don't go over NFS but just run on the
> local file system.
>
> I suspect the problem is with the FS cache. Or perhaps lseek and/or
> ftruncate are just broken...
[...]
--
Maxim Konovalov, maxim@FreeBSD.org
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