Re: [matplotlib-devel] refcount bug

An an extra data point, the attached script runs for over 1000 
iterations on Linux.  By no means am I suggesting that as a fix ;) 
...just a data point for someone on Windows that this is probably 
Windows-specific.

Cheers,
Mike

Jörgen Stenarson wrote:
> 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.
> 
> 
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA