attemptInsertIntoBucket has an infinite while loop that led to a deadlock under specific conditions of a pair of WCE's being thrown by multiple threads in this loop. This code is getting more difficult to comprehend, it could be worth adding a mechanism to exit the loop after a number of iterations to help cleanup state and retry at a higher level.

This prevents other classes of logic issues that may or may not exist today, and would protect against code changes in this loop or its downstream callees.