GNU logs - #55093, boring messages

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Subject: bug#55093: "split -n K/N <file>" BUG: Last Chunk incomplete if input file >= 262144 bytes
Resent-From: Adam Holt <holt@HIDDEN>
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Date: Sun, 24 Apr 2022 10:40:01 -0400
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Hello !

Where do I report a serious data loss bug with GNU's split command?

Example:

$ dd if=/dev/random of=file bs=262144 count=1    # Create file containing
262144 bytes

$ split -n 1/2 file | wc -c
131072
$ split -n 2/2 file | wc -c
0    # SHOULD BE 131072

split -n 1/3 file | wc -c
87381
split -n 2/3 file | wc -c
87381
split -n 3/3 file | wc -c
0    # SHOULD BE 87382

The Last Chunk is completely missing, as you can see in both above examples.

Additionally, if the input file is larger than 2^18 = 262144 bytes, the
Last Chunk generated by "split -n K/N file" is then truncated (i.e. many
bytes are missing, from the beginning of the Last Chunk).

Here's the version number I'm running:

$ split --version
split (GNU coreutils) 8.32
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <
https://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 Torbjorn Granlund and Richard M. Stallman.

Thanks so much for your help forwarding this to anybody who might be able
to confirm and ideally resolve this for all !

Regards,
Adam

--
https://internet-in-a-box.org
https://twitter.com/internet_in_box

--000000000000cb36f605dd6770e0
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<div dir=3D"ltr">Hello !<div><br></div><div>Where do I report a serious dat=
a loss bug with GNU&#39;s split command?</div><div><br></div><div>Example:<=
/div><div><br></div><div><blockquote style=3D"margin:0 0 0 40px;border:none=
;padding:0px"><div>$ dd if=3D/dev/random of=3Dfile bs=3D262144 count=3D1=C2=
=A0 =C2=A0 # Create file containing 262144 bytes<br></div><div><br></div><d=
iv>$ split -n 1/2 file | wc -c<br>131072<br>$ split -n 2/2 file | wc -c<br>=
0=C2=A0 =C2=A0 # SHOULD BE=C2=A0131072<br></div><div><br></div><div>split -=
n 1/3 file | wc -c<br>87381<br></div><div>split -n 2/3 file | wc -c<br>8738=
1<br></div><div>split -n 3/3 file | wc -c<br>0=C2=A0 =C2=A0 # SHOULD BE 873=
82<br></div></blockquote></div><div><br></div><div>The Last Chunk is comple=
tely missing, as you can see in both above examples.</div><div><br></div><d=
iv>Additionally, if the input=C2=A0file is larger than 2^18 =3D 262144 byte=
s, the Last Chunk generated by &quot;split -n K/N file&quot; is then trunca=
ted (i.e. many bytes are missing,=C2=A0from the beginning of the Last Chunk=
).</div><div><br></div><div><div>Here&#39;s the version number I&#39;m runn=
ing:</div><div><br></div><div><blockquote style=3D"margin:0px 0px 0px 40px;=
border:none;padding:0px"><div>$ split --version<br>split (GNU coreutils) 8.=
32<br>Copyright (C) 2020 Free Software Foundation, Inc.<br>License GPLv3+: =
GNU GPL version 3 or later &lt;<a href=3D"https://gnu.org/licenses/gpl.html=
">https://gnu.org/licenses/gpl.html</a>&gt;.<br>This is free software: you =
are free to change and redistribute it.<br>There is NO WARRANTY, to the ext=
ent permitted by law.<br><br>Written by Torbjorn Granlund and Richard M. St=
allman.</div></blockquote></div></div><div><br></div><div>Thanks so much fo=
r=C2=A0your help forwarding this to anybody who might be able to confirm an=
d ideally resolve=C2=A0this for all !</div><div><br></div><div>Regards,</di=
v><div>Adam</div><div><br></div><div>--</div><div><a href=3D"https://intern=
et-in-a-box.org">https://internet-in-a-box.org</a></div><div><a href=3D"htt=
ps://twitter.com/internet_in_box">https://twitter.com/internet_in_box</a></=
div></div>

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Adam Holt <holt@HIDDEN>
Subject: bug#55093: Acknowledgement ("split -n K/N <file>" BUG: Last Chunk
 incomplete if input file >= 262144 bytes)
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Subject: bug#55093: "split -n K/N <file>" BUG: Last Chunk incomplete if input file >= 262144 bytes
Resent-From: Paul Eggert <eggert@HIDDEN>
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On 4/24/22 07:40, Adam Holt wrote:

> split (GNU coreutils) 8.32

That's an old version, dated 2020. Please try the current version 
coreutils 9.1, which has bug fixes in this area.

Also, there's no need to cc. rms and tg; they're not working on 'split' 
any more.

Thanks.

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