Josh Rosenberg added the comment: The fact that it's resolved by PyGC_Collect indicates there is a reference cycle somewhere. PyGC_Collect is just looking for cyclic garbage and breaking the cycles so it can be cleaned; it would happen eventually unless GC was explicitly disabled or the process exited before the next implicit GC invocation, so it means this bug is really about timing (and possibly cycles we'd prefer to avoid), not reference leaks.
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