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Fairly new Ubuntu 16.04 Desktop installation with SSD hard drive, 64Gb memory.
System runs OK for a day or two then desktop environment becomes completely
unresponsive (display frozen).
You can ssh into it (very slow response when you enter the password) and "top"
shows that the CPU is being 100% used by three processes:
top - 22:02:58 up 2:26, 4 users, load average: 18.00, 17.96, 15.87
Tasks: 293 total, 16 running, 274 sleeping, 0 stopped, 3 zombie
%Cpu(s): 0.9 us, 9.6 sy, 0.0 ni, 89.1 id, 0.4 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 64276428 total, 60695284 free, 2272164 used, 1308980 buff/cache
KiB Swap: 31412220 total, 31412220 free, 0 used. 61740156 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1278 systemd+ 20 0 96092 2360 2188 R 106.7 0.0 51:11.22
systemd-timesyn
14 root 20 0 0 0 0 R 100.0 0.0 25:42.02 kworker/1:0
6314 colord 20 0 280824 6060 5428 R 100.0 0.0 25:42.01 colord-sane
2692 jrc 20 0 2869988 322548 271288 S 6.7 0.5 4:20.13 VirtualBox
1 root 20 0 120208 6332 3936 D 0.0 0.0 0:01.77 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.01 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/0
5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00
kworker/0:0H
7 root 20 0 0 0 0 S 0.0 0.0 0:07.34 rcu_sched
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
9 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
10 root rt 0 0 0 0 S 0.0 0.0 0:00.02 watchdog/0
11 root rt 0 0 0 0 R 0.0 0.0 0:00.02 watchdog/1
12 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/1
13 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/1
15 root 0 -20 0 0 0 S 0.0 0.0 0:00.00
kworker/1:0H
16 root rt 0 0 0 0 R 0.0 0.0 0:00.02 watchdog/2
17 root rt 0 0 0 0 R 0.0 0.0 0:00.00 migration/2
18 root 20 0 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/2
Memory is clearly not an issue, but something seems to be making it hog
CPU cycles and hang
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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Ubuntu 16.04 Desktop kworker/1:0 and systemd-timesync use 100% CPU, system very
slow
https://bugs.launchpad.net/bugs/1586417
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