Description of problem:
  Two tracebacks were appeared during testing of realtime profiles (component tuned). First was generated in /var/log/tuned/tuned.log by command `tuned-adm verify` on realtime-virtual* profiles. 

  Second traceback was created when some realtime-virtual* profile was active and user decided to select other profile.

  Problem exists for all realtime profiles (realtime-virtual-host, realtime-virtual-guest) from package tuned-profiles-nfv.


Version-Release number of selected component (if applicable):
  tuna-0.11.1-12.el7_2.noarch
  tuned-2.7.1-2.el7.noarch
  tuned-profiles-nfv-2.7.1-2.el7.noarch
  qemu-kvm-tools-rhev-2.3.0-31.el7_2.21.x86_64


Steps to Reproduce:
  # systemctl status tuned | grep Active
     Active: active (running) since Wed 2016-08-24 07:00:50 CEST; 35min ago
  # tuned-adm active
  Current active profile: balanced
  # tuned-adm profile realtime-virtual-host
  # tuned-adm verify

  >>> see traceback in /var/log/tuned/tuned.log 
2016-08-24 12:07:20,902 ERROR    tuned.plugins.plugin_script: script '/usr/lib/tuned/realtime/script.sh' error: 1, 'Traceback (most recent call last):
  File "/usr/bin/tuna", line 656, in <module>
    main()
  File "/usr/bin/tuna", line 493, in main
    (op, a) = pick_op(a)
  File "/usr/bin/tuna", line 408, in pick_op
    if argument[0] in ('+', '-'):
IndexError: string index out of range'

  # tuned-adm profile balanced

  >>> see traceback in /var/log/tuned/tuned.conf
2016-08-24 12:07:52,299 ERROR    tuned.plugins.plugin_script: script '/usr/lib/tuned/realtime-virtual-host/script.sh' error: 1, 'Traceback (most recent call last):
  File "/usr/bin/tuna", line 656, in <module>
    main()
  File "/usr/bin/tuna", line 494, in main
    op_list = tuna.cpustring_to_list(a)
  File "/usr/lib/python2.7/site-packages/tuna/tuna.py", line 124, in cpustring_to_list
    ends = [ int(a, 0) for a in field.split("-") ]
ValueError: invalid literal for int() with base 0: '}''

 
Actual results:
  two tracebacks was appeared in /var/log/tuned/tuned.conf

Expected results:
  no tracebacks

---------------------------------------------------

Traceback are copied from BZ#1369791 (tuned).

From comment c#6 (jskarvad):

"I will take a look, but it's probably minor problem. You need to setup "isolated_cores" in: "/etc/tuned/realtime-virtual-host-variables.conf" and "/etc/tuned/realtime-virtual-guest-variables.conf" to sane values and your machine needs to be multicore with enough cores to satisfy your request. One backtrace is even from the Tuna tool, so you could also open bug against Tuna to cleanly exit instead of traceback if invalid cpustring is provided (e.g. '}'). Nevertheless, the Tuned profile should be fixed not to traceback."

link: https://bugzilla.redhat.com/show_bug.cgi?id=1369791#c6