For the debug build of the test program (at least), it looks like we are getting the default thread stack size of 512 KB instead of the 1 MB that we get on all other platforms.

On Linux and Windows, I can set the StackChecker limit to 800 KB to see how much stack space is used in a test, then set it back down to a value calculated to pass the StackChecker limit. When I try this on the Mac, I get

Bus error: 10

Same error with 510 KB. Dropping the limit to 490 KB gets me past the bus error.