Exception while running command(['/usr/bin/hostnamectl', '--static']): [Errno 24] Too many open files

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Have the same issue with the version 3.9.1-16 / Linux 4.12.4-1.el7.elpro.x86_64:

    Traceback (most recent call last):

File “/opt/rockstor/src/rockstor/rest_framework_custom/generic_view.py”, line 41, in _handle_exception
yield
File “/opt/rockstor/src/rockstor/storageadmin/views/appliances.py”, line 41, in get_queryset
self._update_hostname()
File “/opt/rockstor/eggs/Django-1.8.16-py2.7.egg/django/utils/decorators.py”, line 145, in inner
return func(*args, **kwargs)
File “/opt/rockstor/src/rockstor/storageadmin/views/appliances.py”, line 48, in _update_hostname
cur_hostname = gethostname()
File “/opt/rockstor/src/rockstor/system/osi.py”, line 766, in gethostname
o, e, rc = run_command([HOSTNAMECTL, ‘–static’])
File “/opt/rockstor/src/rockstor/system/osi.py”, line 113, in run_command
‘Exception while running command({}): {}’.format(cmd, e))
Exception: Exception while running command([’/usr/bin/hostnamectl’, ‘–static’]): [Errno 24] Too many open files