CI failures on OSX

Hello devs, OSX CI seems to have testsuite failures since at least 44ba66527ae2 https://phabricator.haskell.org/rGHC44ba66527ae207ce2dd64eb2bce14656d474f6d1 (but likely caused by something else) and started sometime after 966aa7818222 https://phabricator.haskell.org/rGHC966aa7818222a8637b56ca32b3892901de1bf5d4 going by the Phab history. So seems to have been caused by one of the commits on Aug 22. Could anyone with an Mac take a look there? Cheers Andreas