Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1213978944 (LWP 16244)]
0xb7d0acbc in memcpy () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt
#0  0xb7d0acbc in memcpy () from /lib/tls/i686/cmov/libc.so.6
#1  0xb7ea65f4 in std::string::_Rep::_M_clone () from /usr/lib/libstdc++.so.6
#2  0xb7ea6f17 in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string () from /usr/lib/libstdc++.so.6
#3  0x0804cb17 in main ()