libtirpc 0.2.3-1 breaks pam_unix, making login and su(do) impossible:
May 05 03:22:54 philomeena login[24274]: PAM unable to
dlopen(/usr/lib/security/pam_unix.so): /usr/lib/security/pam_unix.so:
undefined symbol: log_debug
May 05 03:22:54 philomeena login[24274]: PAM adding faulty module:
/usr/lib/security/pam_unix.so
I was lucky that one of my terminals still had a valid sudo timestamp,
or I would have needed a reboot into rescue mode.