Comment 2 for bug 1355998

According to logstash this started just after the daily nodepool image updates completed, and is only happening on devstack-trusty nodes in hpcloud-b1. I have deleted that image and held one of the nodes booted from it (which reports 33554432 from /proc/sys/kernel/shmmax just like nodes booted from the previous day's image). I've gone over the image update log, which didn't contain any obvious configuration/setup errors, but will compare it to an earlier run and other hpcloud provider network versions of the same to see if there's a relevant difference.