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OpenBSD 7.3 changed its implementation of pthread_get_name_np/pthread_set_name_np to wrap new libc functions getthrname/setthrname and lowered the max buffer size from 32 to 24. This is not a backwards-compatible change because if we were to put in comptime version logic to use size 32 when target < 7.3 the binaries would be undefined when running on >= 7.3. It also could simply be that OpenBSD has a policy to not support older binaries running on newer releases? Regardless, the safest course is to simply use the smallest known buffer size. As an aside, this bug manifested as a "hung" std.Thread test because 7.3 pthread API never checks for error result when wrapping getthrname/setthrname. This is not a problem in std.Thread when we use the correct max buffer size because ERANGE/EINVAL become unreachable.