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Subject: bug#68216: An instance of DD receiving data from another instance with bs=1M reports the wrong record count.
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From: "jared@HIDDEN" <jared@HIDDEN>
To: bug-coreutils@HIDDEN
Message-ID: <cd3307d5-4d61-4f8d-a569-1269e4c1d9cb@HIDDEN>
Subject: An instance of DD receiving data from another instance with bs=1M
reports the wrong record count.
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<p>Hi all,</p>
<p>It seems an instance of `dd`=C2=A0 with only an output file doesn'=
t
report the count of records accurately despite bs=3D being describe=
d
as influencing both ibs=3D and obs=3D</p>
<p>dd'ing from an unstable remote over ssh today I had it continue
from the last received block between crashes in preparation for a
P2V. The remote had bs=3D1M set with its in=3Ddevice and the local
instance had bs=3D1M too with the destination of=3D device but upon=
referring to the receiving end's stable count of records I noticed
it ignored my bs=3D1M setting. This were worked around using obs=3D=
1M
to make the counter show a value I could reliable skip=3D/seek=3D w=
ith
to resume.</p>
<p>I have an example here:</p>
<blockquote>
<p><i>$ dd if=3D/dev/zero bs=3D1M count=3D1 | dd bs=3D1M of=3D/dev/=
null<br>
1+0 records in<br>
1+0 records out<br>
1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.0010021 s, 1.0 GB/s<b=
r>
<b>0+16 records in<br>
0+16 records out</b><br>
1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.000771722 s, 1.4
GB/s</i></p>
</blockquote>
<p>This is being experienced on Archlinux with kernel '6.6.4' and
package 'core/coreutils 9.4-2'</p>
<p>dd's man page for this distribution shows:</p>
<blockquote>
<p><i>bs=3DBYTES<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 read and write up to BYTES bytes at a time
(default: 512); overrides ibs and obs</i></p>
</blockquote>
<p>So I feel it not overriding obs=3D when invoked with only of=3D an=
d
bs=3D arguments could be a bug.</p>
<p>Running a single dd with <i>if=3Dsource of=3Ddest bs=3D1M</i> work=
s as
intended.</p>
<p>While in my case this isn't a fatal bug working with virtual
block devices it could be problematic for use cases which require
a proper treatment of block sizes such as tape devices.<br>
</p>
<p>Best regards,<br>
Jared<br>
</p>
</body>
</html>
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Subject: bug#68216: An instance of DD receiving data from another instance with bs=1M reports the wrong record count.
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forcemerge 8171 68216
stop
On 02/01/2024 10:45, jared@HIDDEN wrote:
> Hi all,
>
> It seems an instance of `dd` with only an output file doesn't report
> the count of records accurately despite bs= being described as
> influencing both ibs= and obs=
>
> dd'ing from an unstable remote over ssh today I had it continue from the
> last received block between crashes in preparation for a P2V. The remote
> had bs=1M set with its in=device and the local instance had bs=1M too
> with the destination of= device but upon referring to the receiving
> end's stable count of records I noticed it ignored my bs=1M setting.
> This were worked around using obs=1M to make the counter show a value I
> could reliable skip=/seek= with to resume.
>
> I have an example here:
>
> /$ dd if=/dev/zero bs=1M count=1 | dd bs=1M of=/dev/null
> 1+0 records in
> 1+0 records out
> 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.0010021 s, 1.0 GB/s
> *0+16 records in
> 0+16 records out*
> 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.000771722 s, 1.4 GB/s/
>
> This is being experienced on Archlinux with kernel '6.6.4' and package
> 'core/coreutils 9.4-2'
>
> dd's man page for this distribution shows:
>
> /bs=BYTES
> read and write up to BYTES bytes at a time (default:
> 512); overrides ibs and obs/
>
> So I feel it not overriding obs= when invoked with only of= and bs=
> arguments could be a bug.
>
> Running a single dd with /if=source of=dest bs=1M/ works as intended.
>
> While in my case this isn't a fatal bug working with virtual block
> devices it could be problematic for use cases which require a proper
> treatment of block sizes such as tape devices.
Well the behavior is expected and documented:
‘bs=BYTES’
Set both input and output block sizes to BYTES. This makes ‘dd’
read and write BYTES per block, overriding any ‘ibs’ and ‘obs’
settings. In addition, if no data-transforming ‘conv’ operand is
specified, input is copied to the output as soon as it’s read, even
if it is smaller than the block size.
For details please see https://bugs.gnu.org/8171
thanks,
Pádraig.
X-Loop: help-debbugs@HIDDEN
Subject: bug#68216: Re: An instance of DD receiving data from another instance with bs=1M, reports the wrong record count.
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On 02/01/2024 22:45, jared@HIDDEN wrote:
> Hi Pádraig,
>
> iflag=fullblock seems to resolve this experience and the man page
> excerpt provided makes sense though those lines make no appearance in
> the man pages on Archlinux. I will follow up with the distro maintainers.
As would explicitly specifying obs on the second dd instance.
cheers,
Pádraig
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.