sudo-ldap segfaults in 14.04 and ldap

Dumb question: I am running a reasonably current version of 14.04:

raub@testfirewall:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04 LTS
Release: 14.04
Codename: trusty
raub@testfirewall:~$ uname -a
Linux testfirewall 3.13.0-27-generic #50-Ubuntu SMP Thu May 15 18:06:16 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
raub@testfirewall:~$

and have before upgrading to 14.04 been using sudo-ldap so network admins can do some work. However, in 14.04, I am seeing

raub@testfirewall:~$ sudo pwd
sudo: LDAP Config Summary
sudo: ===================
sudo: uri ldap://kdc.domain.com ldap://kdc2.domain.com
sudo: ldap_version 3
sudo: sudoers_base ou=SUDOers,dc=domain,dc=com
sudo: binddn (anonymous)
sudo: bindpw (anonymous)
sudo: bind_timelimit 3
sudo: timelimit 3
sudo: deref 0
sudo: ssl start_tls
sudo: tls_cacertfile /etc/ssl/certs/ca-certificates.crt
sudo: use_sasl yes
sudo: sasl_auth_id (NONE)
sudo: rootuse_sasl -1
sudo: rootsasl_auth_id (NONE)
sudo: sasl_secprops (NONE)
sudo: krb5_ccname FILE:/tmp/host.tkt
sudo: ===================
sudo: ldap_set_option: debug -> 0
sudo: ldap_set_option: tls_cacertfile -> /etc/ssl/certs/ca-certificates.crt
sudo: ldap_set_option: tls_cacert -> /etc/ssl/certs/ca-certificates.crt
sudo: ldap_initialize(ld, ldap://kdc.domain.com ldap://kdc2.domain.com)
sudo: ldap_set_option: ldap_version -> 3
sudo: ldap_set_option: timelimit -> 3
sudo: ldap_set_option(LDAP_OPT_TIMEOUT, 3)
sudo: ldap_set_option(LDAP_OPT_NETWORK_TIMEOUT, 3)
sudo: ldap_start_tls_s() ok
sudo: sudo_ldap_sasl_interact: SASL_CB_USER
Segmentation fault (core dumped)

raub@testfirewall:~$

From syslog:
Jun 5 15:16:26 testfirewall kernel: [2068248.457275] sudo[22925]: segfault at 0 ip 00007f2feb02692a sp 00007ffff55073b8 error 4 in libc-2.19.so[7f2feaf9d000+1bc000]

That affects both local and network users. Now, if I disable ldap for sudoers in /etc/nsswitch.conf,

# sudoers: files ldap
sudoers: files

I can sudo from a local user with sudo rights. What am I missing here?