[Boost-users] [asio]crash when acess boost::system::error_code err.message()

hello, I use boost1.40.0 on linux2.6/gcc4.1.2. when my process execute code as flow, my process crash.: void CSapConnection::HandleWrite(const boost::system::error_code& err) { std::cout<<"error:" <message(value()); } (gdb) p this $1 = (const boost::system::error_code * const) 0xb6bf0f64 (gdb) p *this $2 = {m_val = 136236300, m_cat = 0xd56658} (gdb) p *m_cat $3 = {boost::noncopyable_::noncopyable = {<No data fields>}, _vptr.error_category = 0x0} Is this a bug of asio??