New submission from Brandon Stansbury <brandonrstansb...@gmail.com>:
Under multi-threading scenarios a race condition may occur where a thread sees
an initialized `_b85chars` table but an uninitialized `_b85chars2` table due to
the guard only checking the first table.
This causes an exception like:
```
File "/usr/lib/python3.6/base64.py", line 434, in b85encode
return _85encode(b, _b85chars, _b85chars2, pad),
File "/usr/lib/python3.6/base64.py", line 294, in _85encode
for word in words],
File "/usr/lib/python3.6/base64.py", line 294, in <listcomp>
for word in words],
"TypeError: 'NoneType' object is not subscriptable
```
----------
components: Library (Lib)
messages: 358495
nosy: drmonkeysee
priority: normal
pull_requests: 17096
severity: normal
status: open
title: Base 85 encoding initialization race conditiong
type: crash
versions: Python 3.6
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39068>
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