Our source code configuration happens to have some source code which doesn't play well with Creator's clang source code model which sometimes leads to crashes of the clang-background process. It would be barely noticeable but on our development PCs "ulimit -c unlimited" is called and therefore, when working on a problematic source file, the hard disk can get filled up on core dumps pretty quickly.
Therfore I propose either add "ulimit -c 0"  in bin/qtcreator.sh or call the apropriate functions before exec the backend process.