* We need a real test case, reduced or not.
  * We also need to know your CPU/OS combination.
  * We need to know which of the `--gc:boehm|refc|markAndSweep` GCs produce the 
problem.



> Any ideas on how best to debug this type of situation?

Try Nim's different GC options.

> Are there known issues with GC on 0.19.0 which have been fixed since it was 
> released?

The GCs have no known issues that would produce the behaviour you're describing.

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