CODEWITHSUNDEEP
pythonmatplotlibthread-safety
Antonis Christofides
Antonis Christofides

Reputation: 6949

Fatal Python error: GC object already tracked

I use matplotlib to create some charts, using the AGG backend.

import matplotlib
matplotlib.use('AGG')
import matplotlib.plot as plt

# ...

def chart_view(request):
    fig = plt.figure
    # Do stuff with fig and finally save it in a Django HttpResponse
    # object and return the HttpResponse object.

Now I have a web page that has three images, all three images resulting in running chart_view. Only one image usually makes it, and the Django development server stops with "Fatal Python error: GC object already tracked". I'm not certain the problem is in matplotlib, it could be in pandas.

How can I debug the problem?

Upvotes: 0

Views: 2521

Answers (1)

Antonis Christofides
Antonis Christofides

Reputation: 6949

OK, I found out that it's doing it when I use Debian Jessie's matplotlib 1.4.2 in combination with the latest pandas (0.17.0) that I have installed with pip install --upgrade --no-deps pandas (in a virtualenv that uses --system-site-packages). If I use Debian's pandas 0.14.1 everything's fine. Go figure why this is. Anyway, using Debian's packages is what I intended to do so this solves the problem for me.

Upvotes: 0

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