René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"2.0.0b4, debian unstable: lots of ImageComparisonFailure","articleBody":"Hello,\nwhile testing 2.0.0b4 on debian unstable, there are a lot of ImageComparisonFailure. it seems that the same test is executed twice, and the first execution always fails, for example:\n\n```\nmatplotlib.tests.test_axes.test_canonical.test ... FAIL\nmatplotlib.tests.test_axes.test_canonical.test ... ok\nmatplotlib.tests.test_axes.test_canonical.test ... ok\n... ... ...\nFAIL: matplotlib.tests.test_axes.test_canonical.test\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/usr/lib/python2.7/dist-packages/nose/case.py\", line 197, in runTest\n    self.test(*self.arg)\n  File \"/build/matplotlib-2.0.0~beta4/build/lib.linux-x86_64-2.7/matplotlib/testing/decorators.py\", line 58, in failer\n    result = f(*args, **kwargs)\n  File \"/build/matplotlib-2.0.0~beta4/build/lib.linux-x86_64-2.7/matplotlib/testing/decorators.py\", line 261, in do_test\n    '(RMS %(rms).3f)'%err)\nImageComparisonFailure: images not close: /build/matplotlib-2.0.0~beta4/result_images/test_axes/canonical.png vs. /build/matplotlib-2.0.0~beta4/result_images/test_axes/canonical-expected.png (RMS 0.003)\n```\n\n(that is the 2.7 failure, but it happens also on 3.5 and on their debug flavor interpreters).\n\nthe grand total of the testsuite is `FAILED (KNOWNFAIL=69, SKIP=14, failures=887)`\n\nplease let me know how i can help you debug this\n","author":{"url":"https://github.com/sandrotosi","@type":"Person","name":"sandrotosi"},"datePublished":"2016-09-18T20:59:50.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":22},"url":"https://github.com/7134/matplotlib/issues/7134"}