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When exit on file is present in a system and term/break signal is catched, them dmeventd is no longger refusing to exit. For the correct shutdown, there should be ideally unmonitoring call, however in some case it's very hard to implement this correct procedure. With this 'exit on' file dmeventd at least avoid 'blocking' shutdown, before systemd kills use with -9 anyway possibly even in some unwanted stated of internal dmeventd processing (i.e. in the middle of some lvm command processing).