[ python-Bugs-1063937 ] Random core dumps

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Bugs item #1063937, was opened at 2004-11-10 10:50
Message generated for change (Comment added) made by munder12
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Category: Python Interpreter Core
Group: Python 2.2.3
Status: Open
Resolution: None
Priority: 7
Submitted By: munder12 (munder12)
Assigned to: Nobody/Anonymous (nobody)
Summary: Random core dumps

Initial Comment:
I have narrowed it down as far as I can by continuing
to make the problem simpler and simpler but where it
still core dumps.

The way this is set up is the following:

pytest2.py and pytest.py are in the same directory.

pytest3.py is in PYTHONPATH where PYTHONPATH is
<abs_path>/BASE:<abs_path>/SUP  (pytest3.py is in BASE).


Run ./pytest2.py several times.
This current problem core dumps on average about 2
times every 5 runs.

I have attached a file that has the Python listings as
well as the gdb traceback.

This is running under Fedora Core 1 with:

Python 2.2.3 (#1, Oct 15 2003, 23:33:35)
[GCC 3.3.1 20030930 (Red Hat Linux 3.3.1-6)] on linux2

Thank you,
Mark

PS  Strangely enough the comments in pytest.py seem to
actually increase the frequency of core dumps.

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>Comment By: munder12 (munder12)
Date: 2004-11-16 18:47

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It is 2 times out of 8 runs of the main script.  Actually, that is 
2 cores out of 1600 runs of the script that really cores.  It 
does seem to be localized to Fedora Core 1.  Fedora Core 2, 
Win 2000, Win XP, and Mandrake 9 on similar hardware do not 
have the problem with these scripts.

The Python 2.4b2 is straight out of the tarball (compiled and 
installed cleanly).  The core dumps occur randomly with 
posixpath.py, site.py, etc. and at different stages (robject() 
and within fstat() (from /usr/include/sys/stat.h)).


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Comment By: Michael Hudson (mwh)
Date: 2004-11-16 02:38

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Hmm.  The traceback shows that it's dumping core while loading 
the site.pyc file from the disk.  This happens before Python begins 
executing whatever code you've asked it to.  You could try 
deleting the site.pyc file and see if that makes any difference, or 
running python -S.

I still think there must be something odd about your setup.  If 
Python 2.4b2 cored 25% of the time it was launched, someone 
else would have noticed by now :)

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Comment By: munder12 (munder12)
Date: 2004-11-11 10:05

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I have checked out and built Python 2.4b2.  It still core
dumps on these same files but it now takes on average about
8 runs to get 2 cores.

I will attach the 2.4b2 core traceback.


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Comment By: Michael Hudson (mwh)
Date: 2004-11-11 09:34

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Uh, if that tiny thing cores, I'm very much inclined to
believe there's something flaky in your setup.

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Comment By: munder12 (munder12)
Date: 2004-11-11 09:25

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I have played some more with the setup.  Now only pytest2.py
and pytest.py need to be present in same directory.

Running pytest2.py will randomly cause core dumps coming
from pytest.py.

If you run pytest.py enough times directly it also will
randomly core.

I have attached pytest.py and pytest2.py.

I have not tried with any other version of Python yet.

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Comment By: Michael Hudson (mwh)
Date: 2004-11-11 08:47

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Have you tried a more recent Python?

I'm finding decoding your report (attempting to reproduce) a
little challenging.  Could you upload a tarball containing a
shell script driver or something?

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