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2018.1 crashes in basic code with strings

This crash occurs in Centos 7.4 and Centos 6.9 w/ devtoolkit-6. In other words, GCC 6 plus intel compiler 2018.1. There is no crash using 2018.0. It works fine in -O0 but -O2 and -O3 crash.

#include <cstring>
#include <string>
#include <iostream>

std::string a() {
  return "xxxxxxxxxxxxxxxxxx";
}
std::string b() {
  return std::string("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx") + std::string("x");
}
int main( int argc, char *argv[] ) {
  auto s = a() + b();
  printf("%s, %lu, %lu\n", s.c_str(), s.length(), strlen(s.c_str()));
  return 0;
}


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