==32714==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x10b1346 in std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::__put_character_sequence<char, std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*, unsigned long) /usr/include/c++/v1/ostream:723:13
#1 0x10b0604 in std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::operator<<<std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*) /usr/include/c++/v1/ostream:865:12
#2 0x10b022b in main /home/qqq/11_sanitizer/test1.cpp:13:12
#3 0x10578da in _start /usr/src/lib/csu/amd64/crt1.c:76:7
Uninitialized value was created by an allocation of '__s' in the stack frame of function '_ZNSt3__124__put_character_sequenceIcNS_11char_traitsIcEEEERNS_13basic_ostreamIT_T0_EES7_PKS4_m'
#0 0x10b0cf0 in std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::__put_character_sequence<char, std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*, unsigned long) /usr/include/c++/v1/ostream:717
SUMMARY: MemorySanitizer: use-of-uninitialized-value /usr/include/c++/v1/ostream:723:13 in std::__1::basic_ostream<char, std::__1::char_traits<char> >& std::__1::__put_character_sequence<char, std::__1::char_traits<char> >(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, char const*, unsigned long)
Exiting