problem with qsharedmemory

[daemonna]

usershm.lock();
    char *to = (char*)usershm.data();
    const char *from = this->data.data();
    memcpy(to, from, qMin(usershm.size(), usershm.size()));
    usershm.unlock();

usershm.lock();
    char *to = (char*)usershm.data();
    const char *from = this->data.data();
    memcpy(to, from, qMin(usershm.size(), usershm.size()));
    usershm.unlock();

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fixed... usercache replaced this->data.data();... but app still crash...