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Marshal() was called with the read lock held, and in turn called Created() which also takes the read lock. This is fine by itself, but there is a risk of deadlock if another call to lock the mutex happens concurrently, as the lock call will block the inner rlock and the outer rlock can never become unlocked. It's an easy fix as marshalling is guaranteed to be called with a read lock and does not need to call any methods that read lock themselves.