During stepUp of RangeDeleterService we call _joinAndResetState() without the class mutex. As part of this function we also clear _rangeDeletionTasks.

In general the public API of this service calls _acquireMutexFailIfServiceNotUp so we would expect that no external thread would access the _rangeDeletionTasks before the service initialization is completed and the _state is set to kUp.

There are two special public API that uses _acquireMutexUnconditionally and then access the _rangeDeletionTasks object:

• RangeDeleterService::dumpState
• RangeDeleterService::totalNumOfRegisteredTasks

This means that these two functions can access the _rangeDeletionTasks object while the service is still down and potentially at the same time that the _joinAndResetState() is clearing it.