Thanks Dave for this info. Also, I checked with Dave on IRC that PID
2522 (from which the request starts) is account-polld:

    phablet   2522  0.0  1.4 934112 14176 ?        Ssl  Sep09   9:38
/usr/bin/account-polld

online-accounts-service tries to create a trusted session having PID 2522 as 
initiatior, but since account-polld has no window associated with it, mir 
cannot create the trust session.
I think there are two problems here:
1) when talking to signond, account-polld should set the "UiPolicy" parameter 
to 2 (aka NoUserInteractionPolicy), so that we won't try to open a trust 
session for it.
2) account-polld should not continuosly retry authenticating if the previous 
attempt just failed.

** No longer affects: sync-monitor (Ubuntu)

** Also affects: account-polld (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: ubuntu-system-settings-online-accounts (Ubuntu)

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https://bugs.launchpad.net/bugs/1496773

Title:
  Dbus-daemon-system-fork on ota6 is using large amounts of CPU

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