ERR Unknown state <41> for process with pid 31139

I'm using Metricbeat 6.0 on Debian 9 (stretch) and I toggled redis.disabled in modules.d sub directory and adjusted hosts variable, followed by restarting metricbeat.service and now I'm seeing following error

root@app11:/etc/metricbeat/modules.d# tail -1 /var/log/metricbeat/metricbeat
2017-12-03T18:48:29Z ERR  Unknown state <41> for process with pid 31139
root@app11:/etc/metricbeat/modules.d# ps -p 31139
  PID TTY          TIME CMD
31139 ?        00:00:00 (sd-pam)

needless to say, I don't see anything in [Metricbeat Redis] Overview (Kibana)

Please advise.

Could you enabled INFO or DEBUG logging and share the output? Also it would be great if you could share the config for the redis module and what you get when you run metricbeat modules list.

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