lightdm segfaults when trying to log in with NIS user

[Owen Dunn]

Running ubuntu 14.04 LTS with lightdm 1.10.0-0ubuntu3

The system is configured to use NIS so has:

passwd: files nis
group: files nis
shadow: files nis

in /etc/nsswitch.conf.

A NIS user can log in on a virtual console (tty1 etc.) but trying
to log in under lightdm fails, with the following in dmesg:

[ 1452.065454] lightdm[2957]: segfault at 0 ip 00007fd8935b9be0 sp 00007fffaeafd270 error 4 in libc-2.19.so[7fd89354a000+1bc000]

and the following in /var/log/lightdm/lightdm.log:

[+0.32s] DEBUG: Session pid=3281: Greeter connected version=1.10.0
[+0.55s] DEBUG: Session pid=3281: Greeter start authentication
[+0.55s] DEBUG: Session pid=3402: Started with service 'lightdm', username '(null)'
[+0.56s] DEBUG: Session pid=3402: Got 1 message(s) from PAM
[+0.56s] DEBUG: Session pid=3281: Prompt greeter with 1 message(s)
[+13.86s] DEBUG: Session pid=3281: Greeter start authentication for osd1000
[+13.86s] DEBUG: Session pid=3402: Sending SIGTERM
[+13.87s] DEBUG: Session pid=3432: Started with service 'lightdm', username 'osd1000'
[+13.87s] DEBUG: Session pid=3402: Terminated with signal 15
[+13.87s] DEBUG: Session: Failed during authentication
[+13.87s] DEBUG: Seat: Session stopped
[+13.87s] DEBUG: Session pid=3432: Got 1 message(s) from PAM
[+13.87s] DEBUG: Session pid=3281: Prompt greeter with 1 message(s)
[+20.55s] DEBUG: Session pid=3281: Continue authentication
[+20.66s] DEBUG: Session pid=3432: Terminated with signal 11
[+20.66s] DEBUG: Session: Failed during authentication
[+20.66s] DEBUG: Session pid=3281: Authenticate result for user osd1000: Authentication stopped before completion
[+20.66s] DEBUG: Seat: Session stopped
[+20.71s] DEBUG: Session pid=3281: Greeter start authentication for osd1000
[+20.71s] DEBUG: Session pid=3434: Started with service 'lightdm', username 'osd1000'
[+20.71s] DEBUG: Session pid=3434: Got 1 message(s) from PAM
[+20.71s] DEBUG: Session pid=3281: Prompt greeter with 1 message(s)

[Owen Dunn (osd1000)]

I think this is actually an instance of 1308043, and removing pam-kwallet fixes the problem.