Python 3 ships an outdated valgrind suppressison file.

[mic-e]

BPO	24141
Nosy	@vstinner, @tiran, @ned-deily
Superseder	bpo-24111: Valgrind suppression file should be updated

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2015-05-07.18:39:04.796>
created_at = <Date 2015-05-07.15:30:10.883>
labels = []
title = 'Python 3 ships an outdated valgrind suppressison file.'
updated_at = <Date 2015-05-07.18:39:04.780>
user = 'https://bugs.python.org/mic-e'

bugs.python.org fields:

activity = <Date 2015-05-07.18:39:04.780>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2015-05-07.18:39:04.796>
closer = 'ned.deily'
components = []
creation = <Date 2015-05-07.15:30:10.883>
creator = 'mic-e'
dependencies = []
files = []
hgrepos = []
issue_num = 24141
keywords = []
message_count = 3.0
messages = ['242716', '242717', '242722']
nosy_count = 4.0
nosy_names = ['vstinner', 'christian.heimes', 'ned.deily', 'mic-e']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '24111'
type = None
url = 'https://bugs.python.org/issue24141'
versions = ['Python 3.4']

[mic-e]

The suppression file that is shipped in Misc/valgrind-python.supp of the CPython 3(.x) source tarball only works with CPython 2.

This was tested on Debian Sid, with Python 3.4.3 and Python 2.7.9, both presumably not compiled with "--valgrind".

Since Debian does not ship valgrind-python.supp, I downloaded the source tarball for Python 3.4.3, and edited the suppression file (un-commenting the rules for Free and Realloc, as the documentation suggests for when running with a non-valgrind-aware version of CPython).

The test results are as follows:

$ uname -a
Linux mic 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt9-2 (2015-04-13) x86_64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux unstable (sid)
Release:	unstable
Codename:	sid
$ valgrind --version
valgrind-3.10.1
$ python3 --version
Python 3.4.3
$ python2 --version
Python 2.7.9
$ valgrind --tool=memcheck --suppressions=/tmp/Python-3.4.3/Misc/valgrind-python.supp python3 -c 'import sys; print(sys.version)'
(...) ERROR SUMMARY: 666 errors from 61 contexts (suppressed: 0 from 0)
$ valgrind --tool=memcheck --suppressions=/tmp/Python-3.4.3/Misc/valgrind-python.supp python2 -c 'import sys; print(sys.version)'
(...) ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 486 from 28)

[mic-e]

Note:

Additionally replacing

PyObject_Free -> _PyObject_Free

and

PyObject_Realloc -> _PyObject_Realloc

appears to fix the issue.

[ned-deily]

Thanks for the report. This problem and solution was just reported recently in bpo-24111.