Github user jbapple-cloudera commented on the issue: https://github.com/apache/thrift/pull/1232 UBSan refuses to report an error more than once, and unfortunately it does not have a way to override this behavior. So, once you've seen one UBSan error at a particular line in a particular function, it won't report it again until the binary exits. I agree that we are not using boost::filesystem::path. This was a different error from https://github.com/boostorg/lexical_cast/blob/boost-1.54.0/include/boost/lexical_cast.hpp#L1620.
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