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Description of problem:
rteval triggers exception and prints a traceback while running on bare-metal.

Version-Release number of selected component (if applicable):
rteval: 2.14-12.el7
kernel: 3.10.0-1040.rt56.999.el7.x86_64

How reproducible:
Always.

Steps to Reproduce:
1. Install kernel-rt and rteval. 
2. Execute "rteval --onlyload --duration=1m --verbose"
3. Check the console output.

Actual results:
Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/threading.py", line 812, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/site-packages/rteval/modules/__init__.py", line 195, in run
    raise RuntimeError()
RuntimeError


Expected results:
rteval starts and doesn't print any traceback.

Additional info:

The problem is caused by missing software requires needed to compile the kernel which is done by kcompile.py to put a stress / load on the machine while measuring real-time performances.

This is a safe change even now, since the only change is to the spec file in the form of Requires

it seems that we need to ensure that the node argument to Popen is passed as a string here as well.

Created attachment 1642350 [details]
pass node argument as string to Popen in hackbench.py

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:1118