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The finalizer references the finalized object, preventing garbage collection SCC-SA5005

Bug risk
Major

A finalizer is a function associated with an object that runs when the garbage collector is ready to collect said object, that is when the object is no longer referenced by anything.

If the finalizer references the object, however, it will always remain as the final reference to that object, preventing the garbage collector from collecting the object. The finalizer will never run, and the object will never be collected, leading to a memory leak. That is why the finalizer should instead use its first argument to operate on the object. That way, the number of references can temporarily go to zero before the object is being passed to the finalizer.

References

  • https://medium.com/@blanchon.vincent/go-finalizers-786df8e17687