Windows dtest 3.0: consistent_reads_after_write_test (materialized_views_test.TestMaterializedViewsConsistency) timing out

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Python27\lib\multiprocessing\forking.py", line 380, in main
On 0; match: 0; extra: 0; missing: 0    prepare(preparation_data)
  File "C:\Python27\lib\multiprocessing\forking.py", line 488, in prepare
    assert main_name not in sys.modules, main_name
AssertionError: __main__