spurious error messages on shutdown

[rohany]

I have an application that prints lots of messages like this on shutdown:

Exception ignored in: <function RegionField.__del__ at 0x203236ae5790>
Traceback (most recent call last):
  File "/autofs/nccs-svm1_home1/rohany/nvidia/legate.core/legate/core/store.py", line 126, in __del__
    self.detach_external_allocation(unordered=True, defer=True)
  File "/autofs/nccs-svm1_home1/rohany/nvidia/legate.core/legate/core/store.py", line 251, in detach_external_allocation
    attachment_manager.detach_external_allocation(
  File "/autofs/nccs-svm1_home1/rohany/nvidia/legate.core/legate/core/runtime.py", line 585, in detach_external_allocation
    self._remove_allocation(alloc)
  File "/autofs/nccs-svm1_home1/rohany/nvidia/legate.core/legate/core/runtime.py", line 570, in _remove_allocation
    self._remove_attachment(alloc)
  File "/autofs/nccs-svm1_home1/rohany/nvidia/legate.core/legate/core/runtime.py", line 565, in _remove_attachment
    raise RuntimeError("Unable to find attachment to remove")
RuntimeError: Unable to find attachment to remove
```.

[manopapad]

Is this on a successful exit? We've seen this happen on failed executions, but it would always go away once we fixed the original failure.

[rohany]

Yes, it's on a successful exit.

[manopapad]

OK, can I get a reproducer?