[Python-Dev] Newly Built Python3 Binary Throws Segfault

[Ryan]

Could you try the steps at http://stackoverflow.com/a/11369475/2097780? They allow you to get a better idea of where libc is crashing.

Cyd Haselton <chaselton at gmail.com> wrote:
>Managed to get this out of logcat:
>F(11914) Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1), thread
>11914 (python)  (libc)
>
>[ 01-29 19:30:55.855 23373:23373 F/libc     ]
>Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1), thread 23373 (python)
>
>Less detail than strace but it seems to be that python is segfaulting
>libc...
>
>On Wed, Jan 28, 2015 at 11:23 AM, Ryan Gonzalez <rymg19 at gmail.com>
>wrote:
>> On Wed, Jan 28, 2015 at 10:43 AM, Guido van Rossum <guido at python.org>
>wrote:
>>>
>>> What I see in the strace:
>>>
>>> ... load libpython3.4m.so.1.0
>>> ... load libm
>>> ... open /dev/__properties__ and do something to it (what?)
>>> ... get current time
>>> ... allocate memory
>>> ... getuid
>>> ... segfault
>>>
>>> That's not a lot to go on, but it doesn't look as if it has started
>to
>>> load modules yet.
>>>
>>> Does /dev/__properties__ ring a bell? Not to me.
>>>
>>
>>
>https://android.googlesource.com/platform/system/core/+/tools_r22/init/property_service.c
>> is the code that works with that file.
>>
>> This explains it a bit (slides 24-29). Looks like something to do
>with
>> interprocess communication. Likely has nothing to do with Python
>itself.
>>
>> Maybe this would be useful?
>>
>>>
>>> That stack trace would be really helpful.
>>>
>>> On Wed, Jan 28, 2015 at 8:34 AM, Cyd Haselton <chaselton at gmail.com>
>wrote:
>>>>
>>>> Apologies...I'm not sure what a stack track is, but I do have the
>>>> strace.  Nearest I can tell, it happens due to an open call, though
>I
>>>> am probably wrong.
>>>> Attaching the strace output to this email.  I'm going to head back
>to
>>>> the documentation and to back out of some Android-related changes
>in
>>>> _localemodule.c
>>>>
>>>> On Wed, Jan 28, 2015 at 9:43 AM, Guido van Rossum
><guido at python.org>
>>>> wrote:
>>>> > There could be a million differences relevant (unicode, ints,
>...).
>>>> > Perhaps
>>>> > the importlib bootstrap is failing. Perhaps the dynamic loading
>code
>>>> > changed. Did you get a stack track? (IIRC strace shows a syscall
>trace
>>>> > --
>>>> > also useful, but doesn't tell you precisely how it segfaulted.)
>>>> >
>>>> > On Wed, Jan 28, 2015 at 6:43 AM, Cyd Haselton
><chaselton at gmail.com>
>>>> > wrote:
>>>> >>
>>>> >> All,
>>>> >> I recently ditched my attempts to port Python 2.7.8 to Android
>in
>>>> >> favor of Python 3.4.2.  Unfortunately, after using the same
>configure
>>>> >> options in the same environment, and modifying the setup.py as
>needed,
>>>> >> the newly built binary throws a segfault when the
>generate-posix-vars
>>>> >> portion of the build is reached...and when it is run as well
>(i.e.
>>>> >> ./python --help, ./python -E -S -m sysconfig, or similar)
>>>> >>
>>>> >> I took a strace of ./python, however I'm a bit lost when
>reviewing it.
>>>> >> Any ideas as to what may be going on...i.e. why Python 2.7 works
>but
>>>> >> 3.x throws a segfault?
>>>> >>
>>>> >> Thanks in advance,
>>>> >> Cyd
>>>> >> _______________________________________________
>>>> >> Python-Dev mailing list
>>>> >> Python-Dev at python.org
>>>> >> https://mail.python.org/mailman/listinfo/python-dev
>>>> >> Unsubscribe:
>>>> >>
>https://mail.python.org/mailman/options/python-dev/guido%40python.org
>>>> >
>>>> >
>>>> >
>>>> >
>>>> > --
>>>> > --Guido van Rossum (python.org/~guido)
>>>
>>>
>>>
>>>
>>> --
>>> --Guido van Rossum (python.org/~guido)
>>>
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>>
>>
>>
>> --
>> Ryan
>> If anybody ever asks me why I prefer C++ to C, my answer will be
>simple:
>> "It's becauseslejfp23(@#Q*(E*EIdc-SEGFAULT. Wait, I don't think that
>was
>> nul-terminated."
>> Personal reality distortion fields are immune to contradictory
>evidence. -
>> srean
>> Check out my website: http://kirbyfan64.github.io/

-- 
Sent from my Android phone with K-9 Mail. Please excuse my brevity.
Check out my website: http://kirbyfan64.github.io/
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