Don't call DrupalDefaultEntityController::resetCache() inside a transaction

node and user module assumes that DrupalDefaultEntityController::resetCache() only handles a static cache, therefore it's safe to call inside the transaction of user_save() and node_save().

However, it's possible to override the entity controller through hook_entity_info_alter(), thereby invalidating the beforementioned assumption.

When using Entity Cache with a non-db backend, there's the possibility of having the cache repopulated with old data in high concurrenty environments.

Patch coming up ...