I have upgraded to pulseaudio 1:8.0-0ubuntu3.3.
At the same time, my system got upgraded to use a 4.10 kernel (instead of a 4.8 
kernel).

The effect: The lockups got worse:
  - machine not pingable during the lockup,
  - freeze for 2 hours or more; I decided to reboot.

Now I downgraded to a 4.8 kernel.

The effect: The lockups are still there, but are temporary:
  - machine remains pingable,
  - freeze for only a couple of minutes.

The latest such freeze (at 18:57) led to these syslog messages:

Sep 11 18:58:55 rtkit-daemon[2231]: The canary thread is apparently starving. 
Taking action.
Sep 11 18:58:55 rtkit-daemon[2231]: Demoting known real-time threads.
Sep 11 18:58:56 systemd[1]: systemd-timesyncd.service: Watchdog timeout (limit 
3min)!
Sep 11 18:58:56 rtkit-daemon[2231]: Successfully demoted thread 2612 of process 
2230 (n/a).
Sep 11 18:58:56 rtkit-daemon[2231]: Successfully demoted thread 2611 of process 
2230 (n/a).
Sep 11 18:58:56 rtkit-daemon[2231]: Successfully demoted thread 2610 of process 
2230 (n/a).
Sep 11 18:58:56 rtkit-daemon[2231]: Successfully demoted thread 2230 of process 
2230 (n/a).
Sep 11 18:58:56 rtkit-daemon[2231]: Demoted 4 threads.
Sep 11 18:58:57 systemd[1]: systemd-timesyncd.service: Main process exited, 
code=killed, status=6/ABRT
Sep 11 18:58:57 systemd[1]: systemd-timesyncd.service: Unit entered failed 
state.
Sep 11 18:58:57 systemd[1]: systemd-timesyncd.service: Failed with result 
'signal'.
Sep 11 18:58:57 systemd[1]: systemd-timesyncd.service: Service has no hold-off 
time, scheduling restart.
Sep 11 18:58:57 systemd[1]: Stopped Network Time Synchronization.
Sep 11 18:58:58 systemd[1]: Starting Network Time Synchronization...
Sep 11 18:59:00 systemd[1]: Started Network Time Synchronization.

Process 2230 is (again) pulseaudio.

** Changed in: pulseaudio (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1712858

Title:
  system freezes occasionally for several minutes

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