Flaky `test_eventstream`

```
_______________________________ test_eventstream _______________________________
cls =
func = . at 0x7f8b2fda08b0>
when = 'call'
reraise = (, )
@classmethod
deffrom_call(
cls,
func: "Callable[[], TResult]",
when: "Literal['collect', 'setup', 'call', 'teardown']",
reraise: Optional[
Union[Type[BaseException], Tuple[Type[BaseException], ...]]
] = None,
) -> "CallInfo[TResult]":
"""Call func, wrapping the result in a CallInfo.
:param func:
The function to call. Called without arguments.
:param when:
The phase in which the function is called.
:param reraise:
Exception or exceptions that shall propagate if raised by the
function, instead of being wrapped in the CallInfo.
"""
excinfo = None
start = timing.time()
precise_start = timing.perf_counter()
try:
> result: Optional[TResult] = func()
../../../miniconda3/envs/dask-distributed/lib/python3.8/site-packages/_pytest/runner.py:338:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
../../../miniconda3/envs/dask-distributed/lib/python3.8/site-packages/_pytest/runner.py:259: in
lambda: ihook(item=item, **kwds), when=when, reraise=reraise
../../../miniconda3/envs/dask-distributed/lib/python3.8/site-packages/pluggy/_hooks.py:265: in __call__
returnself._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
../../../miniconda3/envs/dask-distributed/lib/python3.8/site-packages/pluggy/_manager.py:80: in _hookexec
returnself._inner_hookexec(hook_name, methods, kwargs, firstresult)
../../../miniconda3/envs/dask-distributed/lib/python3.8/site-packages/_pytest/unraisableexception.py:88: in pytest_runtest_call
yield from unraisable_exception_runtest_hook()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
defunraisable_exception_runtest_hook() -> Generator[None, None, None]:
with catch_unraisable_exception() as cm:
yield
if cm.unraisable:
if cm.unraisable.err_msg isnotNone:
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.71838.015577' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.49856.844897' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.71403.245208' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.76156.958033' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Couldn't use data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.58774.611791': database disk image is malformed
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.88423.637725' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.71433.202906' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.51025.124290' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.65926.052803' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.87205.147986' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.71807.996177' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.59210.244339' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.51405.471817' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.62744.948090' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.57998.822544' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
/Users/runner/miniconda3/envs/dask-distributed/lib/python3.8/site-packages/coverage/data.py:130: CoverageWarning: Data file '/Users/runner/work/distributed/distributed/.coverage.Mac-1657778395203.local.54513.411094' doesn't seem to be a coverage data file: cannot unpack non-iterable NoneType object
data._warn(str(exc))
err_msg = cm.unraisable.err_msg
else:
err_msg = "Exception ignored in"
msg = f"{err_msg}: {cm.unraisable.object!r}\n\n"
msg += "".join(
traceback.format_exception(
cm.unraisable.exc_type,
cm.unraisable.exc_value,
cm.unraisable.exc_traceback,
)
)
> warnings.warn(pytest.PytestUnraisableExceptionWarning(msg))
E pytest.PytestUnraisableExceptionWarning: Exception ignored in:
E
E Traceback (most recent call last):
E File "/Users/runner/work/distributed/distributed/distributed/deploy/cluster.py", line 206, in __del__
E _warn(f"unclosed cluster {self_r}", ResourceWarning, source=self)
E ResourceWarning: unclosed cluster SSHCluster(SSHCluster, 'tcp://10.212.18.23:54933', workers=0, threads=0, memory=0 B)
../../../miniconda3/envs/dask-distributed/lib/python3.8/site-packages/_pytest/unraisableexception.py:78: PytestUnraisableExceptionWarning
----------------------------- Captured stderr call -----------------------------
2022-07-14 06:24:28,760 - distributed.worker - WARNING - Compute Failed
Key: div-beaac0206246b34d3625d21194e03c13
Function: div
args: (1, 0)
kwargs: {}
Exception: "ZeroDivisionError('division by zero')"

```
https://github.com/dask/distributed/runs/7334390386?check_suite_focus=true#step:11:2602