GNU bug report logs - #52049
Bug in shred -u

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#52049: closed (Bug in shred -u)
Date: Tue, 23 Nov 2021 02:14:01 +0000

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Your message dated Mon, 22 Nov 2021 18:12:47 -0800
with message-id <5e75f1dc-f2fd-abe0-93bb-761017430106 <at> cs.ucla.edu>
and subject line Re: bug#52049: More Information
has caused the debbugs.gnu.org bug report #52049,
regarding Bug in shred -u
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: David McLaughlin <david.mclaughlin <at> theredx.com>
To: bug-coreutils <at> gnu.org
Subject: Re: Bug in shred -u
Date: Mon, 22 Nov 2021 16:21:37 -0700

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Sorry. I thought I was on 20.04 Ubuntu, but reading my report of a bug, I
was not.
Please disregard this, as there is no failure on more current OSs.

On Mon, Nov 22, 2021 at 3:20 PM David McLaughlin <
david.mclaughlin <at> theredx.com> wrote:

> Hello,
>
> It seems that shred utilizes a pattern of renaming and then unlinking.
> However, I don't see the use of a lock for this pattern and so there is a
> race condition and the shred command can fail. This test case is timing
> sensitive, and therefore doesn't happen every time. But it happens
> frequently. I am trying to write robust code that depends on shred and I
> find this issue is problematic.
>
> Test case:
> $ touch a b c && for file in a b c; do shred -u -n 1 $file & done && wait
> [1] 28262
> [2] 28263
> [3] 28264
> shred: c: failed to remove: No such file or directory
> [1]   Done                    shred -u -n 1 "$file"
> [2]-  Done                    shred -u -n 1 "$file"
> [3]+  Exit 1                  shred -u -n 1 "$file"
>
>
> Other information:
> $ shred --version
> shred (GNU coreutils) 8.21
> Copyright (C) 2013 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <
> http://gnu.org/licenses/gpl.html>.
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
>
> Written by Colin Plumb.
>
> $ cat /etc/os-release
> NAME="Ubuntu"
> VERSION="14.04.6 LTS, Trusty Tahr"
> ID=ubuntu
> ID_LIKE=debian
> PRETTY_NAME="Ubuntu 14.04.6 LTS"
> VERSION_ID="14.04"
> HOME_URL="http://www.ubuntu.com/"
> SUPPORT_URL="http://help.ubuntu.com/"
> BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
>
> $ bash --version
> GNU bash, version 4.3.11(1)-release (x86_64-pc-linux-gnu)
> Copyright (C) 2013 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <
> http://gnu.org/licenses/gpl.html>
>
> This is free software; you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
>

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: David McLaughlin <david.mclaughlin <at> theredx.com>
Cc: 52049-done <at> debbugs.gnu.org
Subject: Re: bug#52049: More Information
Date: Mon, 22 Nov 2021 18:12:47 -0800

On 11/22/21 17:21, David McLaughlin wrote:
> Please disregard this, as there is no failure with shred version 8.30.

Thanks for letting us know; closing the bug report

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