[matplotlib-devel] refcount bug

[Jörgen Stenarson]

Hi,

I have a problem with matplotlib crashing with a ref count assertion 
error. I see this problem intermittently both when using ipython using 
%run to execute plot scripts many times and when embedding a plot in a 
Tk application.
In both cases I use TkAgg as a backend I have compiled matplotlib r3933 
using mingw32 on windows using the win32_static library.

The smallest self contained example I have been able to come up with is 
this:

import random,time
from numpy import pi,arange,sin
import pylab

pylab.ion()
x=arange(0,6*pi,0.1)
for i in range(1000):
    print i
    pylab.cla()
    for i in range(1):
        pylab.plot(x,sin(random.random()*pi+x*random.random()))

which when executed generates the following output. Running this script 
several times I get the crash after around 60 iterations. On crash I 
also a messagebox, see attached png file.

Does anyone else see this? What can I do to help narrow down this bug.

/Jörgen


C:\python>python bugtest-matplotlib.py
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Fatal Python error: PyEval_RestoreThread: NULL tstate

This application has requested the Runtime to terminate it in an unusual 
way.
Please contact the application's support team for more information.

<<inline: bugtest-matplotlib.png>>-------------------------------------------------------------------------
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