Random Python Code Crashes

[doctorlai-msrc]

See this pipeline: https://belgrade.visualstudio.com/jrt-controller/_build/results?buildId=21731&view=results

    # DEBUG
    print("BEFORE")
    a = 10000 * [0]
    for i in range(10000):
        a[i] = 100 * [1]
    print("AFTER")

It may be related to python memory allocator e.g. PYTHONMALLOC env.