Comment (by Roland Haas):

The issue persists even if I wind back all repos to ET_2019_11 (except wvuthorns which contains new thorns in master), at least on mike (I have not tested the others).

I will try what happens if I rewind wvuthorns as well to check if this is triggered solely by the length of out thornlist.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2345/infinite-make-loop-building-on-blue-waters