linux-kernel - Re: [PATCH v14 08/17] splice: Do splice read from a file without using ITER

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Date:   Fri, 17 Feb 2023 21:39:07 +0100
From:   Alexander Egorenkov <egorenar@...ux.ibm.com>
To:     dhowells@...hat.com
Cc:     Marc Hartmayer <mhartmay@...ux.ibm.com>
Subject: Re: [PATCH v14 08/17] splice: Do splice read from a file without
 using ITER_PIPE

Hello,

this commit breaks our s390x tests on linux-next which use Python 3
among other things.

We are using the Python 3 tox module and for some reason,
the above commit makes Python create files with padded zeroes.

--- a/tox/distro/lib/python3.11/site-packages/_distutils_hack/__init__.py
+++ b/tox/distro/lib/python3.11/site-packages/_distutils_hack/__init__.py
@@ -381,133 +381,4 @@
 000017c0  49 4c 53 5f 46 49 4e 44  45 52 29 0a 20 20 20 20  |ILS_FINDER).    |
 000017d0  65 78 63 65 70 74 20 56  61 6c 75 65 45 72 72 6f  |except ValueErro|
 000017e0  72 3a 0a 20 20 20 20 20  20 20 20 70 61 73 73 0a  |r:.        pass.|
-000017f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
-00001800  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
-00001810  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
-00001820  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
-00001830  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
-00001840  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
-00001850  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
-00001860  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
... 

How to reproduce on Fedora
--------------------------

# dnf install -y python3-tox

# cat >tox.ini <<EOF
[tox]
envlist = dev,distro,doc,lint
skipsdist = True

[testenv:distro]
sitepackages = true
EOF

# python3 -m tox -v --notest -e distro

Error processing line 1 of /mnt/test/.tox/distro/lib/python3.11/site-packages/distutils-precedence.pth:

  Traceback (most recent call last):
    File "<frozen site>", line 186, in addpackage
    File "<string>", line 1, in <module>
  ValueError: source code string cannot contain null bytes

Remainder of file ignored

# The above error message disappears if one reverts the bad commit.

Regards
Alex