Comment 5 for bug 1733662

I've tried upgrading to the latest development kernel, from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc1/, and re-testing. The details of the problem have changed (but they were never 100% consistent), but the problem definitely still exists. I'm attaching dmesg output from three runs:

* run1.txt -- In this run, the cpu_offlining script successfully shut
  down all CPU nodes (except node 0, of course), but when bringing
  them up again, the system segfaulted after bringing up several
  nodes. Thereafter, any remotely substantive command (top or
  shutdown, for instance) hung, although bash remained responsive
  and I could take file listings with ls.
* run2.txt -- In this run, the cpu_offlining script segfaulted
  when taking CPU nodes offline. The system then became unreliable
  in the same way as with run 1.
* run3.txt -- In this run, the script seemed to complete successfully,
  but the dmesg output includes errors associated with bringing up
  several nodes. The system SEEMED TO operate normally thereafter,
  but my testing was limited.