The platform.CheckProcesses Tast test is failing almost every time when it runs on release builders now due to a missing debugd process:

2018/06/28 10:13:06 Started test platform.CheckProcesses
2018/06/28 10:13:06 [10:13:05.715] conntrackd is running
2018/06/28 10:13:06 [10:13:05.715] dbus-daemon is running
2018/06/28 10:13:06 [10:13:05.715] Error at check_processes.go:59: debugd not running
2018/06/28 10:13:06 [10:13:05.715] Stack trace:
...
2018/06/28 10:13:06 [10:13:05.715] metrics_daemon is running
2018/06/28 10:13:06 [10:13:05.715] powerd is running
2018/06/28 10:13:06 [10:13:05.715] shill is running
2018/06/28 10:13:06 [10:13:05.716] udevd is running
2018/06/28 10:13:06 [10:13:05.716] tlsdated is running
2018/06/28 10:13:06 [10:13:05.716] update_engine is running
2018/06/28 10:13:06 [10:13:05.716] wpa_supplicant is running
2018/06/28 10:13:06 Completed test platform.CheckProcesses in 36ms with 1 error(s)

The reason for this is somewhat interesting: this test typically runs shortly after example.DBus, which I recently changed to restart the session_manager job rather than the powerd job ( issue 856390 ).

debugd's Upstart job contains this:

start on started ui
stop on stopping ui or starting halt or starting reboot

The messages log file typically shows debugd restarting right around the time when platform.CheckProcesses runs.

A fix here might be this test to first use "initctl list" to wait for there to not be any jobs in states other than start/running or stop/waiting. Here are some other states that I see when I run "restart ui":

ui start/killed, process 11430
arc-lifetime stop/post-stop, process 13994
ui start/post-stop, process 14005
machine-info start/pre-start, process 14038
ui start/starting
debugd start/pre-start, process 14181

Unfortunately, it looks like there's at least one small window where the ui job has started but debugd isn't yet in pre-start.

Maybe a better option would be to just make this test retry a few times until it sees all processes (although that may run the risk of not catching crash loops).