[ python-Bugs-1241545 ] garbage collection asserts failing

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Bugs item #1241545, was opened at 2005-07-20 08:27
Message generated for change (Comment added) made by munder12
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Category: None
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: munder12 (munder12)
Assigned to: Nobody/Anonymous (nobody)
Summary: garbage collection asserts failing

Initial Comment:
Modules/gcmodule.c:294: visit_reachable: Assertion
`gc_refs > 0 || gc_refs == (-3) || gc_refs == (-2)' failed.

Running Python 2.3.4 on Fedora Core 3 (2.6.11-1.35_FC3smp).
Also tried Python 2.3.5.

When searching Google for this error, found following
link where someone using yum updates was getting same
error from python

http://forums.fedoraforum.org/showthread.php?t=54704



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>Comment By: munder12 (munder12)
Date: 2005-07-20 19:04

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Sorry, I realize it is not much to go on but I cannot currently 
get it to fail other than when I run this one script.  It is all 
written in python.  It is a simulation running a genetic 
algorithm that is set up to run about 24 hours straight.  This 
error occurs within about 5 hours into the simulation 
(repeatedly).  Running similar simulations that complete in 
less than a couple hours run without a problem.

Was hoping someone familiar with the gc routines might 
go  "oh, yeah... -4 is valid now too.." or something similar.

In the meantime, I will be trying to continue to reduce the 
number of imported modules where I can still get the problem 
to happen  There are 2 modules psyco and pyro that are non-
core and Tkinter.  

But since the Google search turned up yum giving same error 
(which I doubt uses psyco, pyro, or Tkinter), I thought I would 
mention it here as I continued searching. 


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Comment By: Tim Peters (tim_one)
Date: 2005-07-20 16:24

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Well, this isn't enough info to go on.  For example, what 
program was Python running at the time?  What were you 
doing?  How could anyone else try to reproduce this?  It's 
certainly not something Python normally does ;-)

FWIW, the most likely cause is bad C coding in a Python 
extension (non-core) module.  That the problem persists for 
you across Python versions points even more at non-core C 
code.

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Comment By: Neil Schemenauer (nascheme)
Date: 2005-07-20 16:20

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Usually this kind of error is caused by a bug in a 3rd party
extension module.  Try to narrow down the test case as much
as possible.  Can you provide a Python script that triggers
the assertion failure?

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Comment By: munder12 (munder12)
Date: 2005-07-20 16:15

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This also fails in Python 2.4.1 on same system.

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