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Here comes a possible might cause the crash stack.
RemoteWorkerController creation fails. If it is Shutdown phase or OOM. The point is ServiceWorkerManager::mRemoteWorkerController is kept as nullptr.
WorkerManagerCreatedRunnable::mManagerWrapper is the only holder of the ServiceWorkerManager. And it would be released once the runnable finished.
When releasing WorkerManagerCreatedRunnable::mManagerWrapper, ServiceWorkerManager::UnregisterHolder() is called. In the end SharedWorkerManager::Terminate() is triggered to release the SharedWorker by calling SharedWorkerManager::mRemoteWorkerController::Terminate. However, SharedWorkerManager::mRemoteWorkerController is reasonably a nullptr here, then we meet a de-reference on nullptr.
Differential Revision: https://phabricator.services.mozilla.com/D187269