Unknown Process DETAIL: Failed process was running: LISTEN dirty

[Jorge Daniel <elgaita@xxxxxxxxxxx>]

Hi guys, we're receiving this kind of Abnormal terminations : 

2018-06-19 14:11:02.394 PDT rhost= app=:user=:db=:LOG:  server process (PID 235545) was terminated by signal 9: Killed

2018-06-19 14:11:02.394 PDT rhost= app=:user=:db=:DETAIL:  Failed process was running: LISTEN dirty

2018-06-19 14:11:02.394 PDT rhost= app=:user=:db=:LOG:  terminating any other active server processes

Does someone has information about "LISTEN DIRTY"  as failed process, I've google it but no mention of this anywhere. 

Thx in advance 

Jorge Daniel Fernandez