[ python-Bugs-1588287 ] python: Python/ast.c:541: seq_for_testlist: Assertion fails

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Bugs item #1588287, was opened at 2006-10-31 15:05
Message generated for change (Comment added) made by nnorwitz
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Category: Parser/Compiler
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Tom Epperly (tepperly)
>Assigned to: Neal Norwitz (nnorwitz)
Summary: python: Python/ast.c:541: seq_for_testlist: Assertion fails

Initial Comment:
I 
1. downloaded Python 2.5 final
wget
'http://www.python.org/ftp/python/2.5/Python-2.5.tar.bz2'
2. edited Python-2.5/Objects/obmalloc.c to uncomment
the #define Py_USING_MEMORY_DEBUGGER line (I plan to
run valgrind on this installation of Python)
3. ./configure --without-pymalloc --with-pydebug
--prefix=/somewhere/python2_5
4. make and then "make install"
5. next I downloaded and extracted numpy-1.0.tar.gz
from Sourceforge:
http://sourceforge.net/project/showfiles.php?group_id=1369&package_id=175103

When I try to run the setup.py for numpy-1.0, I get an
assertion failure.
[epperly at tux163 numpy-1.0]$ python setup.py install
Running from numpy source directory.
python: Python/ast.c:541: seq_for_testlist: Assertion
`((n)->n_type) == 326 || ((n)->n_type) == 318 ||
((n)->n_type) == 319 || ((n)->n_type) == 300' failed.
Abort
[epperly at tux163 numpy-1.0]$


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>Comment By: Neal Norwitz (nnorwitz)
Date: 2006-11-04 11:33

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Thanks for the report.

My guess was close, the problem was:  `1,2`.

Committed revision 52621. (2.6)
Committed revision 52622. (2.5.1)


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Comment By: Neal Norwitz (nnorwitz)
Date: 2006-11-03 11:27

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Sorry, total brainfart.  I saw the pymalloc line above and
got that stuck in my mind.  You are correct that assertions
are only enabled with pydebug.

Can you find the python code that causes the assertion to
trigger.  Once I have a simple test case I should be able to
fix the problem fast.  If my guess is correct, the code
might look something like:  `[]` (ie a list or generator
expr inside back ticks).

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Comment By: Tom Epperly (tepperly)
Date: 2006-11-03 10:58

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I think using --with-pydebug makes the assert statements
live, and the default (--without-pydebug) skips the assert()
statements.

I think it would take a great deal of time to understand the
implementation of Python well enough for me to debug this
myself. Sorry, I don't think there is much I can do more
than reporting it.

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Comment By: Neal Norwitz (nnorwitz)
Date: 2006-11-03 00:48

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That's weird.  This is definitely a non-standard
configuration, but it should work.  I don't understand why
it would matter if using pydebug or not.  It shouldn't make
a diff.  It would take quite a while to setup the same
config.  Can you debug this further?  Either find the python
code that's causing the problem or the problem in the C code?  

My guess is the only way this could happen based on the
grammar is a list inside backticks ``.  But I couldn't
reproduce it.

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Comment By: Tom Epperly (tepperly)
Date: 2006-10-31 15:16

Message:
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If I drop the --with-pydebug from the configure line, it
runs the NumPy's setup.py without error.

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