Fix locking in PushPullCallback #3882
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The journal replaying for #3872 was not completely conclusive as it didn't reproduce the crash. However, it told us exactly what code we were executing when the crash happened. After staring at this code for a while, @eggrobin noticed that the
PushPullCallbackclass would always be destroyed with its internal mutex held. That's violates the invariants ofMutexand might cause plague and pestilence.This change may or may not address #3872.