Version-Release number of selected component:
dnssec-trigger-0.15-4.fc28

Additional info:
reporter:       libreport-2.9.5
cmdline:        /usr/bin/python3 -sE /usr/libexec/dnssec-trigger-script --update
crash_function: check_call
exception_type: subprocess.CalledProcessError
executable:     /usr/libexec/dnssec-trigger-script
interpreter:    python3-3.6.5-1.fc28.x86_64
kernel:         4.16.7-300.fc28.x86_64
runlevel:       N 5
type:           Python3

Truncated backtrace:
subprocess.py:291:check_call:subprocess.CalledProcessError: Command '['unbound-control', 'flush_zone', '.']' returned non-zero exit status 1.

Traceback (most recent call last):
  File "/usr/libexec/dnssec-trigger-script", line 748, in <module>
    main()
  File "/usr/libexec/dnssec-trigger-script", line 735, in main
    Application(sys.argv).run()
  File "/usr/libexec/dnssec-trigger-script", line 470, in run
    self.method()
  File "/usr/libexec/dnssec-trigger-script", line 632, in run_update
    self.run_update_global_forwarders()
  File "/usr/libexec/dnssec-trigger-script", line 655, in run_update_global_forwarders
    UnboundZoneConfig._control([config.flush_command, "."])
  File "/usr/libexec/dnssec-trigger-script", line 306, in _control
    subprocess.check_call(["unbound-control"] + args, stdout=DEVNULL, stderr=DEVNULL)
  File "/usr/lib64/python3.6/subprocess.py", line 291, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['unbound-control', 'flush_zone', '.']' returned non-zero exit status 1.

Local variables in innermost frame:
cmd: ['unbound-control', 'flush_zone', '.']
retcode: 1
kwargs: {'stdout': <_io.BufferedWriter name='/dev/null'>, 'stderr': <_io.BufferedWriter name='/dev/null'>}
popenargs: (['unbound-control', 'flush_zone', '.'],)

Potential duplicate: bug 1489169