[Numpy-discussion] Segmentation fault during tests with Python 2.7.2 on Debian 6?

[Charles R Harris]

On Thu, Apr 12, 2012 at 8:13 PM, Charles R Harris <charlesr.harris at gmail.com
> wrote:

>
>
> On Thu, Apr 12, 2012 at 7:41 PM, Charles R Harris <
> charlesr.harris at gmail.com> wrote:
>
>>
>>
>> On Thu, Apr 12, 2012 at 2:05 AM, Chris Ball <ceball at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I'm trying out various continuous integration options, so I happen to be
>>> testing NumPy on several platforms that I don't normally use.
>>>
>>> Recently, I've been getting a segmentation fault on Debian 6 (with Python
>>> 2.7.2):
>>>
>>> Linux debian6-amd64 2.6.32-5-amd64 #1 SMP Thu Mar 22 17:26:33 UTC 2012
>>> x86_64
>>> GNU/Linux (Debian GNU/Linux 6.0 \n \l)
>>>
>>> nosetests --verbose
>>> /home/slave/tmp/numpy/numpy/random/__init__.py:91: RuntimeWarning:
>>> numpy.ndarray size changed, may indicate binary incompatibility
>>>  from mtrand import *
>>> test_api.test_fastCopyAndTranspose ... ok
>>> test_api.test_array_astype ... ok
>>> test_api.test_copyto_fromscalar ... ok
>>> test_api.test_copyto ... ok
>>> test_api.test_copyto_maskna ... ok
>>> test_api.test_copy_order ... ok
>>> Basic test of array2string. ... ok
>>> Test custom format function for each element in array. ... ok
>>> This should only apply to 0-D arrays. See #1218. ... ok
>>> test_arrayprint.TestArrayRepr.test_nan_inf ... ok
>>> test_str (test_arrayprint.TestComplexArray) ... ok
>>> test_arrayprint.TestPrintOptions.test_basic ... ok
>>> test_arrayprint.TestPrintOptions.test_formatter ... ok
>>> test_arrayprint.TestPrintOptions.test_formatter_reset ... ok
>>> Ticket 844. ... ok
>>> test_blasdot.test_blasdot_used ... SKIP: Skipping test: test_blasdot_used
>>> Numpy is not compiled with _dotblas
>>> test_blasdot.test_dot_2args ... ok
>>> test_blasdot.test_dot_3args ... ok
>>> test_blasdot.test_dot_3args_errors ... ok
>>> test_creation_overflow (test_datetime.TestDateTime) ... ok
>>> test_datetime_add (test_datetime.TestDateTime) ... ok
>>> test_datetime_arange (test_datetime.TestDateTime) ... ok
>>> test_datetime_array_find_type (test_datetime.TestDateTime) ... ok
>>> test_datetime_array_str (test_datetime.TestDateTime) ... ok
>>> test_datetime_as_string (test_datetime.TestDateTime) ... ok
>>> test_datetime_as_string_timezone (test_datetime.TestDateTime) ...
>>> /home/slave/
>>> tmp/numpy/numpy/core/tests/test_datetime.py:1319: UserWarning: pytz not
>>> found,
>>> pytz compatibility tests skipped
>>>  warnings.warn("pytz not found, pytz compatibility tests skipped")
>>> ok
>>> test_datetime_busday_holidays_count (test_datetime.TestDateTime) ... ok
>>> test_datetime_busday_holidays_offset (test_datetime.TestDateTime) ... ok
>>> test_datetime_busday_offset (test_datetime.TestDateTime) ... ok
>>> test_datetime_busdaycalendar (test_datetime.TestDateTime) ... ok
>>> test_datetime_casting_rules (test_datetime.TestDateTime) ... ok
>>> test_datetime_divide (test_datetime.TestDateTime) ... ok
>>> test_datetime_dtype_creation (test_datetime.TestDateTime) ... ok
>>> test_datetime_is_busday (test_datetime.TestDateTime) ... ok
>>> test_datetime_like (test_datetime.TestDateTime) ... ok
>>> test_datetime_maximum_reduce (test_datetime.TestDateTime) ... ok
>>> test_datetime_minmax (test_datetime.TestDateTime) ... ok
>>> test_datetime_multiply (test_datetime.TestDateTime) ... ok
>>> test_datetime_nat_casting (test_datetime.TestDateTime) ... ok
>>> test_datetime_scalar_construction (test_datetime.TestDateTime) ... ok
>>> test_datetime_string_conversion (test_datetime.TestDateTime) ... ERROR
>>> test_datetime_subtract (test_datetime.TestDateTime) ... Segmentation
>>> fault
>>>
>>> With Python 2.6 there doesn't seem to be a problem on the same machine.
>>>
>>> Unfortunately, I haven't had time to investigate (I don't have Debian 6
>>> to use
>>> myself, and I just started a job that doesn't involve any Python...).
>>> However,
>>> according to the Jenkins instance on ShiningPanda.com, the problem began
>>> with
>>> these changes:
>>>
>>>  BUG: ticket #1578, Fix python-debug warning for python >= 2.7.
>>>  STY: Small style fixes.
>>>
>>> For now, that's all I can say; I haven't manually verified the problem
>>> myself
>>> (that it exists, or that it truly started after the changes above). I
>>> hope to
>>> be able to investigate further at the weekend, but I thought I'd post to
>>> the
>>> list now in case someone else can verify the problem.
>>>
>>> Chris
>>>
>>>
>>> Segmentation fault is buried in console output of Jenkins:
>>>
>>> https://jenkins.shiningpanda.com/scipy/job/NumPy/PYTHON=CPython-2.7/6/console
>>>
>>> The previous build was ok:
>>>
>>> https://jenkins.shiningpanda.com/scipy/job/NumPy/PYTHON=CPython-2.7/5/console
>>>
>>> Changes that Jenkins claims are responsible:
>>> https://jenkins.shiningpanda.com/scipy/job/NumPy/PYTHON=CPython-2.7/6/
>>> changes#detail0
>>>
>>>
>>>
>> It seems that python2.7 is far, far, too recent to be part of Debian 6. I
>> mean, finding python 2.7 in recent Debian stable would be like finding an
>> atomic cannon in a 1'st dynasty Egyptian tomb. So it is in testing, but for
>> replication I like to know where you got it.
>>
>>
> Python 2.7 from Debian testing works fine here.
>
>
But ActiveState python (ucs2) segfaults with

>>> a = np.array(['0123456789'], 'U')
>>> a
Segmentation fault

The string needs to be long for this to show.

Chuck

>
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