[issue38033] Use After Free: PyObject_Free (valgrind)

[STINNER Victor]

STINNER Victor  added the comment:

It sounds like the reporter didn't use Valgrind properly. See last comments. If 
Valgrind still reports issues when it's used properly, please reopen the issue 
(or open a new issue). I close the issue for now.

--
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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[issue38033] Use After Free: PyObject_Free (valgrind)

[Charalampos Stratakis]

Charalampos Stratakis  added the comment:

Another thing also, is to be sure to utilize the python's suppression file by 
adding the --suppressions= to valgrind's command line invocation.

--
nosy: +cstratak

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[issue38033] Use After Free: PyObject_Free (valgrind)

[STINNER Victor]

STINNER Victor  added the comment:

By default, Python is optimized for performance but its pymalloc memory 
allocator causes false alarms in Valgrind.

> https://github.com/python/cpython/blob/master/Misc/README.valgrind

This or you can disable pymalloc at runtime using:

PYTHONMALLOC=malloc python3 ...

or:

PYTHONMALLOC=malloc_debug python3 ...

See:
https://docs.python.org/dev/c-api/memory.html
and
https://docs.python.org/dev/using/cmdline.html#envvar-PYTHONMALLOC

--
nosy: +vstinner

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[issue38033] Use After Free: PyObject_Free (valgrind)

[Tim Peters]

Tim Peters  added the comment:

You're probably chasing ghosts ;-)  Please read about what needs to be done to 
use valgrind successfully with Python:

https://github.com/python/cpython/blob/master/Misc/README.valgrind

--
nosy: +tim.peters
title: Use After Free: PyObject_Free -> Use After Free: PyObject_Free (valgrind)

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