Workers have started leaking threads
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flaky test
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- Python
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Description
I've been stress-testing the test suite for the last week.
Starting on 2021-07-10, test_no_threads_lingering has occasionally and randomly started failing - 8 times over 360 runs.
I have 0 failures on 2021-07-08.
This seems to be agnostic to OS and Python version.
Test output:
```
==== Found 43 active threads: ====
<_MainThread(MainThread, started 4424)>
```
Dask-Default-Threads are spawned by distributed/worker.py.
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