GNU bug report logs - #12794
Bug in dd: it sends wrong messages to stderr

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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#12794: closed (Bug in dd: it sends wrong messages to stderr)
Date: Sat, 03 Nov 2012 19:12:01 +0000

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Your message dated Sat, 03 Nov 2012 12:08:45 -0700
with message-id <50956BBD.5080802 <at> cs.ucla.edu>
and subject line Re: bug#12794: Bug in dd: it sends wrong messages to stderr
has caused the debbugs.gnu.org bug report #12794,
regarding Bug in dd: it sends wrong messages to stderr
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: Ganton <kubry <at> terra.com>
To: bug-coreutils <at> gnu.org
Subject: Bug in dd: it sends wrong messages to stderr
Date: Sat, 3 Nov 2012 16:28:49 +0100

Dear sirs:

I send you a bug report.

# DESCRIPTION

Bug in dd: it sends wrong messages to stderr.

For example, when I do backups, I see "errors" from dd... that really aren't. 

# WAY TO REPRODUCE THE BUG

A user can execute:
   partition=$(mount | awk '$2=="on" && $3=="/" {print $1}')
   sudo dd if="$partition" of=/tmp/copseg.dd count=1 bs=512 >/dev/null
and then he sees something like this in his screen:
  1+0 records in
  1+0 records out
  512 bytes (512 B) copied, 0,000129625 s, 3,9 MB/s

# EXPECTED RESULTS:

The user should see nothing, as there was no error and stdout was redirected 
to /dev/null.

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Ganton <kubry <at> terra.com>
Cc: 12794-done <at> debbugs.gnu.org
Subject: Re: bug#12794: Bug in dd: it sends wrong messages to stderr
Date: Sat, 03 Nov 2012 12:08:45 -0700

On 11/03/2012 08:28 AM, Ganton wrote:

> when I do backups, I see "errors" from dd... that really aren't. 

You have a point, but I'm afraid that dd is documented to behave
that way, and it's part of the POSIX standard, and lots of people
depend on it.  To turn off the chatter, use "dd status=noxfer".

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