[boost] Race condition in boost::spirit?

I'm using vc71 with multi-threaded runtime. Sometimes then boost::spirit code is accessed from different threads simultaneously i have access violation at boost/spirit/core/non_terminal/impl/grammar.ipp (255): # ifdef BOOST_SPIRIT_THREADSAFE static boost::thread_specific_ptr<ptr_t> tld_helper; // <-- Here if (!tld_helper.get()) tld_helper.reset(new ptr_t); ptr_t &helper = *tld_helper; # else According to callstack "tss_data" from threads/src/tss.cpp is dereferenced then it still is not initialized.