gistfile1.txt

$ pfexec dtrace -n 'pid$target::_nsc_trydoorcall_ext:entry { ustack(); }' -c "ping google2.com"
dtrace: description 'pid$target::_nsc_trydoorcall_ext:entry ' matched 1 probe
CPU     ID                    FUNCTION:NAME
  0 102448       _nsc_trydoorcall_ext:entry 
              libc.so.1`_nsc_trydoorcall_ext
              libc.so.1`_nsc_search+0xe1
              libc.so.1`nss_search+0x34
              libnsl.so.1`_switch_getipnodebyname_r+0x83
              libnsl.so.1`_get_hostserv_inetnetdir_byname+0x806
              libnsl.so.1`getipnodebyname+0x10f
              libsocket.so.1`get_addr+0x132
              libsocket.so.1`_getaddrinfo+0x6c5
              libsocket.so.1`__xnet_getaddrinfo+0x19
              ping`get_hostinfo+0xad
              ping`resolve_nodes+0x3e
              ping`main+0x74b
              ping`_start_crt+0x97
              ping`_start+0x1a