GLIBC_2.21 __libc_stack_end D 0x4
GLIBC_2.21 __stack_chk_guard D 0x4
GLIBC_2.21 __tls_get_addr F
GLIBC_2.21 _dl_mcount F
GLIBC_2.21 _r_debug D 0x14
GLIBC_2.21 calloc F
GLIBC_2.21 free F
GLIBC_2.21 malloc F
GLIBC_2.21 realloc F