Recent failures on sumpy master

Some observations:

Failure or not seems to depend on the host.
https://gitlab.tiker.net/inducer/sumpy/commits/master suggests !63 (merged) as a possible cuplprit. I've got reversion for that queued up as !65 (closed). If nothing else, that change should contain a sumpy cache version bump (sumpy/version.py) to make sure the new code is exercised and not just old stuff pulled from cache. (@isuruf: You will want to use SUMPY_NO_CACHE=1 python ... during testing.) Sorry I didn't catch this. Cache state could vary across hosts, so this is not inconcsistent with the first point.
It ultimately doesn't seem to depend on the sympy version installed systemwide--that seems to be a red herring.
The logs suggest H2D L2L as a possible culprit.