If you compile with clang directly in the source tree, without using the ports, is it still crashing?

Looking at the backtraces, the SIGBUS can happen only if there is a strict alignment requirement of 8 bytes, which is probably not ensured for all members of structures. There is typically an alignment to 4 bytes, which is a more common requirement, rather than 8 bytes.

If the 8 bytes alignment is not the strict requirement, then there can be some paging error like suggested in the wikipedia article linked above. This is probably more like OS configuration/restriction on dealing with no available memory cases.

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