[issue1704621] interpreter crash when multiplying large lists

[Ivan Zakharyaschev]

Ivan Zakharyaschev  added the comment:

New issue filed: https://bugs.python.org/issue33153

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[issue1704621] interpreter crash when multiplying large lists

[Guido van Rossum]

Guido van Rossum  added the comment:

@imz Please file a new issue.

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[issue1704621] interpreter crash when multiplying large lists

[Ivan Zakharyaschev]

Ivan Zakharyaschev  added the comment:

Hi!

This is broken for tuples (but not for lists, as in the example here) in 2.7.14 
for me. Should we reopen this issue and fix it better?

[builder@localhost ~]$ python
Python 2.7.14 (default, Nov  7 2017, 17:07:17) 
[GCC 6.3.1 20170118 (ALT 6.3.1-alt2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> x = [0] * 2**20
>>> x *= 2**20
Traceback (most recent call last):
  File "", line 1, in 
MemoryError
>>> x = [0,0,0,0,0,0] * 2**20
>>> x *= 2**20
Traceback (most recent call last):
  File "", line 1, in 
MemoryError
>>> x = ('a', 'b')
>>> x = ('a', 'b') * 2**20
>>> x *= 2**20
Segmentation fault
[builder@localhost ~]$ python --version
Python 2.7.14
[builder@localhost ~]$ python
Python 2.7.14 (default, Nov  7 2017, 17:07:17) 
[GCC 6.3.1 20170118 (ALT 6.3.1-alt2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.maxsize
2147483647
>>> sys.maxint
2147483647
>>> 
[builder@localhost ~]$ python RPM/BUILD/Python-2.7.14/Lib/test/test_tuple.py
test_addmul (__main__.TupleTest) ... ok
test_bigrepeat (__main__.TupleTest) ... Segmentation fault
[builder@localhost ~]$

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nosy: +imz

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[issue1704621] interpreter crash when multiplying large lists

[Christian Heimes]

Christian Heimes added the comment:

Python 2.6 (trunk) is raising a MemoryError in a non-debug build, too.
The problem is fixed in 2.6 and 3.0.

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versions:  -Python 2.6, Python 3.0

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[issue1704621] interpreter crash when multiplying large lists

[Guido van Rossum]

Guido van Rossum added the comment:

Fixed in 2.5 branch (to be released with 2.5.2). Unit test added to 2.6
(trunk).

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resolution:  - accepted
status: open - closed

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[issue1704621] interpreter crash when multiplying large lists

[Christian Heimes]

Christian Heimes added the comment:

Python 2.5 still seg faults.

Python 2.6 and 3.0 are raising a memory error. However I'm unsure if the
memory error is also raised in a plain build. I've just Py_DEBUG builds
of 2.6 and 3.0 around.

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nosy: +tiran
versions: +Python 2.5, Python 2.6, Python 3.0

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[issue1704621] interpreter crash when multiplying large lists

[Guido van Rossum]

Guido van Rossum added the comment:

Shouldn't this be fixed before 2.5.2 goes out?

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assignee:  - nnorwitz
nosy: +gvanrossum
priority: normal - high

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