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kotlinlang

In what situation would `scope.isActive == true` but `DebugProbes.printScope(scope)` return `Unit` and `scope.coroutineContext[Job]?.join()` fail to unsuspend?

I have a supervisor `Job` in which I believe all its children are finished (`join` on each child job unsuspends), but a call to `scope.coroutineContext[Job]?.join()` does not unsuspend.

The job is in `active` state. `DebugProbes.printScope(scope)` returns `Unit`,  and `DebugProbes.dumpCoroutines()` shows no coroutines of interest.

This is executing within `runTest`.

Ah, a Ktor `SelectorManager` needed to be closed as well.

The weird thing is if I try to close it
```withContext(<http://Dispatchers.IO|Dispatchers.IO>) {
  selectorManager.close()
}```
the hang still happens, but taking it out of the `withContext` works.