Comment 7 for bug 1273258

I see the same thing on my work machine, an Ubuntu 18.04 and dbus version 1.12.2-1ubuntu1.2.

In my case the processes all look like:
/usr/bin/dbus-daemon --syslog-only --fork --print-pid 5 --print-address 7 --session

If I don't kill the processes an booting the laptop in the morning, by noon I'll have ~4000 processes running.

I regularly kill all dbus-daemons running which have the command line above, and I see no side effects.

I cannot find out which process spawns them, since their PPIDs are all 1, but were probably just adopted by init.