after software update, ip rule list runs on and on

I have the iproute2 package installed on a 14.04 LTS system. Everything was operating just fine. I had not done a software update in a while. I used the Software Updater from Dash and updated the system. It updated a couple hundred megabytes. The update completed without error (as far as I know). It said a reboot was needed. So I rebooted.

After that, I had problems.

Specifically, when I type "ip rule list", the output runs on and on and on, seemingly without end.
0: from all lookup local
0: from all lookup local
0: from all lookup local
0: from all lookup local
0: from all lookup local
0: from all lookup local
...

I tried "ip rule flush" which seems to hang.
I was eventually able to clear out the rules with:
ip rule del pref 0
ip rule del pref 32766
ip rule del pref 32767

But as soon as I try to add the first of the 3 base ip rules, the problem occurs again:
ip rule add from all table local pref 0
ip rule list
0: from all lookup local
0: from all lookup local
0: from all lookup local
0: from all lookup local
0: from all lookup local
0: from all lookup local
...

The same thing occurs if I try to add any of the other standard rules.

I tried updating a second machine. The same thing happened to that one.

Now what?