root@stack01:~# cat rados_over_ipv6.c
#include <stdio.h>
#include "rados/librados.h"

int main(void) {

	rados_t cluster;

	int r;

	r = rados_create(&cluster, "admin");
	if (r < 0) {
		printf("rados_create failed: %d", r);
		return -1;
	}

	rados_conf_set(cluster, "auth_supported", "cephx");
	rados_conf_set(cluster, "mon_host", "monitor.ceph.widodh.nl");
	rados_conf_set(cluster, "keyring", "/etc/ceph/keyring.bin");

	r = rados_connect(cluster);
	if (r < 0) {
		printf("rados_connect failed: %d", r);
		return -2;
	}

	rados_shutdown(cluster);

}
root@stack01:~# gcc -o rados_over_ipv6 rados_over_ipv6.c -lrados -lcrypto
root@stack01:~# ./rados_over_ipv6
Floating point exception
root@stack01:~# gdb ./rados_over_ipv6
GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /root/rados_over_ipv6...(no debugging symbols found)...done.
(gdb) run
Starting program: /root/rados_over_ipv6
[Thread debugging using libthread_db enabled]
[New Thread 0x7ffff5a1a700 (LWP 23370)]
[New Thread 0x7ffff5219700 (LWP 23371)]
[New Thread 0x7ffff4a18700 (LWP 23372)]
[New Thread 0x7ffff4217700 (LWP 23373)]
[New Thread 0x7ffff3a16700 (LWP 23374)]

Program received signal SIGFPE, Arithmetic exception.
0x00007ffff7b250b8 in std::string::operator= (this=0x60c9c8) at /usr/include/c++/4.4/bits/basic_string.h:506
506	      { return this->assign(__str); }
(gdb) bt
#0  0x00007ffff7b250b8 in std::string::operator= (this=0x60c9c8) at /usr/include/c++/4.4/bits/basic_string.h:506
#1  MonClient::_pick_new_mon (this=0x60c9c8) at mon/MonClient.cc:527
#2  0x00007ffff7b26213 in MonClient::_reopen_session (this=0x60c9c8) at mon/MonClient.cc:547
#3  0x00007ffff7b273c1 in MonClient::authenticate (this=0x60c9c8, timeout=<value optimized out>) at mon/MonClient.cc:409
#4  0x00007ffff7a609b6 in librados::RadosClient::connect (this=0x60c6b0) at librados.cc:957
#5  0x0000000000400825 in main ()
(gdb)