Vector Class Discussion

I created a structure "state" that has inside some Vec4i variables and a list containing states

std::list<state> stateInfo;

when i add the first data to stateInfo I got a crash if I use gcc 4.8.1 with optimization enabled ( setting no optimization solve the problem)

state s;

s.vector=0; //<-- Vec4i

stateInfo.push_back(s); <-- CRASH

if I replace the Vec4i with an int the problem is gone.
have you some idea of how to solve the problem? have you ever had such a problem?

best regards Marco