> the problem might not be audio-related at all. It might be some other part of > your kernel that's hanging This is quite possible indeed.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1712858 Title: system freezes occasionally for several minutes Status in linux package in Ubuntu: Incomplete Status in pulseaudio package in Ubuntu: Incomplete Bug description: Occasionally, the system freezes: display does not show mouse move, clock display does not update itself, ssh impossible. But the machine remains pingable. This lasts for 2 to 20 minutes. This is with Ubuntu 16.04.2, now upgraded to kernel version 4.8.0-46-generic. At the end of the freeze, a bunch of messages get written to /var/log/syslog. Examples: Aug 19 00:03:48 quimper rtkit-daemon[2276]: The canary thread is apparently starving. Taking action. Aug 19 00:03:48 quimper rtkit-daemon[2276]: Demoting known real-time threads. Aug 19 00:03:48 quimper rtkit-daemon[2276]: Successfully demoted thread 2607 of process 2275 (n/a). Aug 19 00:03:48 quimper rtkit-daemon[2276]: Successfully demoted thread 2606 of process 2275 (n/a). Aug 19 00:03:48 quimper rtkit-daemon[2276]: Successfully demoted thread 2604 of process 2275 (n/a). Aug 19 00:03:48 quimper rtkit-daemon[2276]: Successfully demoted thread 2275 of process 2275 (n/a). Aug 19 00:03:48 quimper rtkit-daemon[2276]: Demoted 4 threads. Aug 19 08:06:19 quimper rtkit-daemon[2276]: The canary thread is apparently starving. Taking action. Aug 19 08:06:19 quimper rtkit-daemon[2276]: Demoting known real-time threads. Aug 19 08:06:19 quimper rtkit-daemon[2276]: Successfully demoted thread 2607 of process 2275 (n/a). Aug 19 08:06:19 quimper rtkit-daemon[2276]: Successfully demoted thread 2606 of process 2275 (n/a). Aug 19 08:06:19 quimper rtkit-daemon[2276]: Successfully demoted thread 2604 of process 2275 (n/a). Aug 19 08:06:19 quimper rtkit-daemon[2276]: Successfully demoted thread 2275 of process 2275 (n/a). Aug 19 08:06:19 quimper rtkit-daemon[2276]: Demoted 4 threads. Aug 19 08:06:20 quimper systemd[1]: systemd-udevd.service: Watchdog timeout (limit 3min)! Aug 19 08:06:20 quimper systemd[1]: systemd-udevd.service: Main process exited, code=killed, status=6/ABRT Aug 19 08:06:20 quimper systemd[1]: systemd-udevd.service: Unit entered failed state. Aug 19 08:06:20 quimper systemd[1]: systemd-udevd.service: Failed with result 'signal'. Aug 19 08:06:20 quimper systemd[1]: systemd-udevd.service: Service has no hold-off time, scheduling restart. Aug 19 08:06:20 quimper systemd[1]: Stopped udev Kernel Device Manager. Aug 19 08:06:20 quimper systemd[1]: Starting udev Kernel Device Manager... Aug 19 08:06:24 quimper systemd[1]: Started udev Kernel Device Manager. Aug 19 15:04:55 quimper rtkit-daemon[2276]: The canary thread is apparently starving. Taking action. Aug 19 15:04:55 quimper rtkit-daemon[2276]: Demoting known real-time threads. Aug 19 15:04:55 quimper rtkit-daemon[2276]: Successfully demoted thread 2607 of process 2275 (n/a). Aug 19 15:04:55 quimper rtkit-daemon[2276]: Successfully demoted thread 2606 of process 2275 (n/a). Aug 19 15:04:55 quimper rtkit-daemon[2276]: Successfully demoted thread 2604 of process 2275 (n/a). Aug 19 15:04:55 quimper rtkit-daemon[2276]: Successfully demoted thread 2275 of process 2275 (n/a). Aug 19 15:04:55 quimper rtkit-daemon[2276]: Demoted 4 threads. Aug 19 15:04:55 quimper systemd[1]: systemd-timesyncd.service: Watchdog timeout (limit 3min)! Aug 19 15:04:59 quimper systemd[1]: systemd-timesyncd.service: Main process exited, code=killed, status=6/ABRT Aug 19 15:04:59 quimper systemd[1]: systemd-timesyncd.service: Unit entered failed state. Aug 19 15:04:59 quimper systemd[1]: systemd-timesyncd.service: Failed with result 'signal'. Aug 19 15:05:00 quimper systemd[1]: systemd-timesyncd.service: Service has no hold-off time, scheduling restart. Aug 19 15:05:00 quimper systemd[1]: Stopped Network Time Synchronization. Aug 19 15:05:00 quimper systemd[1]: Starting Network Time Synchronization... Aug 19 15:05:00 quimper systemd[1]: Started Network Time Synchronization. Aug 19 15:05:00 quimper systemd-timesyncd[26894]: Synchronized to time server 91.189.89.198:123 (ntp.ubuntu.com). Aug 20 06:03:28 quimper rtkit-daemon[2276]: The canary thread is apparently starving. Taking action. Aug 20 06:03:28 quimper rtkit-daemon[2276]: Demoting known real-time threads. Aug 20 06:03:28 quimper rtkit-daemon[2276]: Successfully demoted thread 2607 of process 2275 (n/a). Aug 20 06:03:28 quimper rtkit-daemon[2276]: Successfully demoted thread 2606 of process 2275 (n/a). Aug 20 06:03:28 quimper rtkit-daemon[2276]: Successfully demoted thread 2604 of process 2275 (n/a). Aug 20 06:03:28 quimper rtkit-daemon[2276]: Successfully demoted thread 2275 of process 2275 (n/a). Aug 20 06:03:28 quimper rtkit-daemon[2276]: Demoted 4 threads. Aug 20 15:09:22 quimper rtkit-daemon[2276]: The canary thread is apparently starving. Taking action. Aug 20 15:09:26 quimper systemd[1]: systemd-udevd.service: Watchdog timeout (limit 3min)! Aug 20 15:09:26 quimper rtkit-daemon[2276]: Demoting known real-time threads. Aug 20 15:09:26 quimper systemd[1]: systemd-udevd.service: Main process exited, code=killed, status=6/ABRT Aug 20 15:09:26 quimper rtkit-daemon[2276]: Successfully demoted thread 2607 of process 2275 (n/a). Aug 20 15:09:26 quimper systemd[1]: systemd-udevd.service: Unit entered failed state. Aug 20 15:09:26 quimper rtkit-daemon[2276]: Successfully demoted thread 2606 of process 2275 (n/a). Aug 20 15:09:26 quimper systemd[1]: systemd-udevd.service: Failed with result 'signal'. Aug 20 15:09:26 quimper rtkit-daemon[2276]: Successfully demoted thread 2604 of process 2275 (n/a). Aug 20 15:09:26 quimper systemd[1]: systemd-udevd.service: Service has no hold-off time, scheduling restart. Aug 20 15:09:26 quimper rtkit-daemon[2276]: Successfully demoted thread 2275 of process 2275 (n/a). Aug 20 15:09:26 quimper systemd[1]: Stopped udev Kernel Device Manager. Aug 20 15:09:26 quimper rtkit-daemon[2276]: Demoted 4 threads. Aug 20 15:09:26 quimper systemd[1]: Starting udev Kernel Device Manager... Aug 20 15:09:27 quimper systemd[1]: Started udev Kernel Device Manager. The process the rtkit-daemon talks about is, in all cases, /usr/bin/pulseaudio. $ ps auxw | grep 2275 haible 2275 0.0 0.0 519164 8576 ? Sl Jul11 3:47 /usr/bin/pulseaudio --start --log-target=syslog I have not used 'pavucontrol' on this machine in 3 months. Info: $ lsb_release -rd Description: Ubuntu 16.04.2 LTS Release: 16.04 $ apt-cache policy pulseaudio pulseaudio: Installed: 1:8.0-0ubuntu3.2 Candidate: 1:8.0-0ubuntu3.3 Version table: 1:8.0-0ubuntu3.3 500 500 http://de.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages *** 1:8.0-0ubuntu3.2 100 100 /var/lib/dpkg/status 1:8.0-0ubuntu3 500 500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1712858/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
