Ceph » rgw

in the function "empty()" when "markers.get()" return the default value, m is a reference to a temporary std::string that is already destroyed when "m.empty()" is invoked.
see:

bool empty(const BucketIndexShardsManager& markers, int size)
{
  for (int i = 0; i < size; ++i) {
    const auto& m = markers.get(i, "");
    if (!m.empty()) {
      return false;
    }   
  }
  return true;
}

the default value should be an explicit std::string that lives in the scope. in the above case it could be a static const empty string.
see example: https://godbolt.org/z/WGfE68E65

coverity CID 1511024