Bug 453582

Summary: Python script aborted with Modules/gcmodule.c Assertion `gc->gc.gc_refs != 0' error
Product: [Fedora] Fedora Reporter: Takanori MATSUURA <t.matsuu>
Component: pythonAssignee: James Antill <james.antill>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: low    
Version: 9CC: james.antill, jonathansteffan, katzj, lyle.lasheimok, t.matsuu
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OS: Linux   
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Last Closed: 2008-07-02 05:40:44 UTC Type: ---
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Description Takanori MATSUURA 2008-07-01 13:23:49 UTC 
+++ This bug was initially created as a clone of Bug #171809 +++

Because bug 171809 has been already closed, I have opened the new one.
Bug 404911, bug 384221 and bug 408341 may dup. of this bug.

When I use pymol program (sorry, it's not a fedora-released package), the
following error occurs.

python: Modules/gcmodule.c:276: visit_decref: Assertion `gc->gc.gc_refs != 0'
failed.

And we can get the same error by using other python-based programs.

The same program works fine if I use home-made python-2.5.2 without applying any
patch in Fedora package.
So I believe this is a Fedora-specific python bug.
Comment 1 Takanori MATSUURA 2008-07-01 13:23:49 UTC 
Created attachment 310665 [details]
gdb output
Comment 2 James Antill 2008-07-01 13:37:06 UTC 
 As you can see with the other bugs, these types of things are assumed to be
pretty much never python GC bugs (or _lots_ of people would be hitting them).
 If you have a shared object that is being loaded into python, esp. if it's
"unusual" I'd look there first.
 After that, you can try running under valgrind (you need the valgrind changes)
as it's _possible_ some core python .so is doing something bad under a weird
condition ... but I'll note that I've never seen that yet.
Comment 3 Takanori MATSUURA 2008-07-02 05:40:44 UTC 
Oops,

The bug has been fixed in the latest trunk of pymol by adding "Py_XINCREF".


Sorry for bugspam.