SIGSEGV in os.putenv()

[PaweKrawczyk]

BPO	25630

^{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 2015-11-16.05:58:19.431>
created_at = <Date 2015-11-15.23:22:18.300>
labels = ['library', 'type-crash']
title = 'SIGSEGV in os.putenv()'
updated_at = <Date 2015-11-16.05:58:19.429>
user = 'https://bugs.python.org/PaweKrawczyk'

bugs.python.org fields:

activity = <Date 2015-11-16.05:58:19.429>
actor = 'python-dev'
assignee = 'none'
closed = True
closed_date = <Date 2015-11-16.05:58:19.431>
closer = 'python-dev'
components = ['Library (Lib)']
creation = <Date 2015-11-15.23:22:18.300>
creator = 'Pawe\xc5\x82 Krawczyk'
dependencies = []
files = []
hgrepos = []
issue_num = 25630
keywords = []
message_count = 2.0
messages = ['254700', '254714']
nosy_count = 2.0
nosy_names = ['python-dev', 'Pawe\xc5\x82 Krawczyk']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue25630'
versions = ['Python 3.5']

[PaweKrawczyk]

A numerical value argument of the os.putenv() call causes my python3.5 to crash with SIGSEGV, for example:

Python 3.5.0+ (default, Oct 11 2015, 09:05:38) 
[GCC 5.2.1 20151010] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.putenv('AAA', 1)
Segmentation fault (core dumped)

While numerical 1 (one) is not a valid argument for the function which expects a string as value, it shouldn't crash but rather throw an exception. This seems to be the behaviour in python3.4:

Python 3.4.3 (default, Oct 14 2015, 20:28:29) 
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.putenv('AAA', 1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: Can't convert 'int' object to str implicitly
>>>

I can provide a strace/ltrace/core dump but it's huge and I'm not sure if it's necessary taking into account that this issue is trivial to reproduce.

[python-dev]

New changeset 3ae62099d70b by Benjamin Peterson in branch '3.5':
make the PyUnicode_FSConverter cleanup set the decrefed argument to NULL (closes bpo-25630)
https://hg.python.org/cpython/rev/3ae62099d70b

New changeset d8d67b502bcc by Benjamin Peterson in branch 'default':
merge 3.5 (bpo-25630)
https://hg.python.org/cpython/rev/d8d67b502bcc