[New-bugs-announce] [issue32758] Stack overflow when parse long expression to AST

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

Python 2 can crash when compile long expression. 

>>> x = eval('""' + '+chr(33)'*100000)
Segmentation fault (core dumped)

This was fixed in Python 3. RecursionError is raised now.

>>> x = eval('""' + '+chr(33)'*100000)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RecursionError: maximum recursion depth exceeded during compilation
>>> x = eval('+chr(33)'*1000000)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
RecursionError: maximum recursion depth exceeded during compilation

But compiling to AST still can crash.

>>> import ast
>>> x = ast.parse('+chr(33)'*1000000)
Segmentation fault (core dumped)

----------
components: Interpreter Core
messages: 311568
nosy: benjamin.peterson, brett.cannon, ncoghlan, serhiy.storchaka, yselivanov
priority: normal
severity: normal
status: open
title: Stack overflow when parse long expression to AST
type: crash
versions: Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32758>
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