Crashed Worker tracking issue
I've been seeing a lot of CI builds failing recently, but I have no idea what's causing them. Can maintainers add them to the table here when they occur?

| CI Job                    | Test | Count |
| ------------------------- | ---- | ----- |
| MacPython linux py_3.7_64 | `TestTableOrientReader::test_read_json_table_orient[vals0-index]` | 1 |
| Windows py37_np18 | `testst_unique.py::test_unique_bad_unicode[idx_or_series_w_bad_unicode0]` | 1 | 
