Failure on LightPlatformCodeInsightFixtureTestCase.setup():java.lang.RuntimeException: java.io.IOException: writePrevChunkAddress:386545,500525

I've been using LightPlatformCodeInsightFixtureTestCase to run tests of my plugin for months now but all of the sudden the tests are crashing inside the super setup function? I have no idea what is causing this and cant find any documentation on this error. Has anyone seen this and can they explain it?

Here is the base class I wrote to build cases off of the Fixture:

public class KnitCompilerTests extends LightPlatformCodeInsightFixtureTestCase {
    @Override
    public void tearDown() throws Exception {
        super.tearDown();
        File stitchCountsLog = new File(this.getTestDataPath()+File.separator+"stitchCountLog.txt");
        File stitchTextCountsLog = new File(this.getTestDataPath()+File.separator+"stitchTextCountLog.txt");
        StitchCountTracker.writeStitchCounts(stitchCountsLog);
        StitchTextCountTracker.writeStitchCounts(stitchTextCountsLog);
    }

    @Override
    public void setUp() throws Exception {
        BasicConfigurator.configure();
        super.setUp();
    }
}

Setup was working with the simple code for a long time, why has it suddenly failed?

Sorry for the dump but the full error/out log is below: https://pastebin.com/raw/ia1e7GnM