Hi everybody
I’m experiencing a strange problem with a kworker process that sucks most of my cpu power when I watch videos (HTML5 or Flash) with firefox or chrome. This kworker process starts using 75-80% of my cpu when I open a video and keeps working even after I close the web browsers and the temperature goes up to 90°C! The only way to stop it is rebooting my pc. I tried to stress the cpu to identify the cause of this issue: it seems to be linked to all the applications that deal with internet media streams, video or audio. Listening to radio streams with clementine gives the same result. These are the values *top *shows in the terminal:
*HTML5 in firefox
top - 00:49:18 up 41 min, 2 users, load average: 2,75, 2,00, 1,63
Tasks: 235 total, 2 running, 233 sleeping, 0 stopped, 0 zombie
%Cpu(s): 12,5 us, 19,9 sy, 0,0 ni, 64,6 id, 3,1 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 6029576 total, 3525532 used, 2504044 free, 127676 buffers
KiB Swap: 6288380 total, 0 used, 6288380 free. 2232508 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5144 root 20 0 0 0 0 R 76,33 0,000 1:42.85 kworker/0:0
4897 geeko 20 0 1698724 664400 105012 S 44,67 11,02 3:52.20 firefox
2456 geeko 20 0 1440084 113072 45620 S 4,000 1,875 1:41.80 /usr/bin/deluge
1298 root 20 0 269104 65624 49324 S 3,000 1,088 1:08.57 X
1829 geeko 9 -11 512320 14900 11356 S 1,667 0,247 1:30.01 pulseaudio
431 root 20 0 12036 5784 1508 S 1,000 0,096 0:03.35 haveged
2424 geeko 20 0 693432 32984 25476 S 1,000 0,547 0:03.99 mate-terminal
2081 geeko 20 0 1545940 108560 39988 S 0,667 1,800 0:36.66 Telegram
582 root -51 0 0 0 0 S 0,333 0,000 0:15.59 irq/51-iwlwifi
1818 geeko 20 0 540832 32436 24244 S 0,333 0,538 0:13.19 marco
1846 geeko 20 0 526240 28468 22268 S 0,333 0,472 0:04.40 mate-netspeed-a
1852 geeko 20 0 402604 17256 14352 S 0,333 0,286 0:04.43 mate-multiload-
1 root 20 0 35904 5624 3348 S 0,000 0,093 0:02.76 systemd
2 root 20 0 0 0 0 S 0,000 0,000 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0,000 0,000 0:00.12 ksoftirqd/0
5 root 0 -20 0 0 0 S 0,000 0,000 0:00.00 kworker/0:0H
7 root -2 0 0 0 0 S 0,000 0,000 0:00.00 rcuc/0
8 root -2 0 0 0 0 S 0,000 0,000 0:00.00 rcub/0
9 root 20 0 0 0 0 S 0,000 0,000 0:02.74 rcu_preempt
10 root 20 0 0 0 0 S 0,000 0,000 0:00.99 rcuop/0
11 root 20 0 0 0 0 S 0,000 0,000 0:00.90 rcuop/1
12 root 20 0 0 0 0 S 0,000 0,000 0:00.64 rcuop/2
13 root 20 0 0 0 0 S 0,000 0,000 0:00.57 rcuop/3
14 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/4
15 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/5
16 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/6
17 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/7
18 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/8
19 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/9
20 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/10
21 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/11
22 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/12
23 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/13
24 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/14
25 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuop/15
26 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcu_sched
27 root 20 0 0 0 0 S 0,000 0,000 0:00.00 rcuos/0
After closing firefox
top - 00:51:36 up 44 min, 2 users, load average: 2,09, 2,03, 1,69
Tasks: 233 total, 2 running, 231 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0,9 us, 17,8 sy, 0,0 ni, 80,8 id, 0,5 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 6029576 total, 2941916 used, 3087660 free, 127892 buffers
KiB Swap: 6288380 total, 0 used, 6288380 free. 2211572 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5144 root 20 0 0 0 0 R 76,74 0,000 3:27.82 kworker/0:0
2456 geeko 20 0 1440084 114388 45620 S 2,658 1,897 1:45.75 /usr/bin/deluge
431 root 20 0 12036 5784 1508 S 1,329 0,096 0:04.70 haveged
2106 geeko 20 0 792520 55748 34440 S 0,664 0,925 0:07.52 claws-mail
1298 root 20 0 257008 56060 39500 S 0,332 0,930 1:11.21 X
2081 geeko 20 0 1545940 108560 39988 S 0,332 1,800 0:37.19 Telegram
2424 geeko 20 0 693432 33092 25584 S 0,332 0,549 0:04.66 mate-terminal
5093 root 20 0 0 0 0 S 0,332 0,000 0:00.12 kworker/u32:0
5193 geeko 20 0 15336 2740 2196 R 0,332 0,045 0:00.12 top
1 root 20 0 35904 5624 3348 S 0,000 0,093 0:02.76 systemd
2 root 20 0 0 0 0 S 0,000 0,000 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0,000 0,000 0:00.13 ksoftirqd/0
5 root 0 -20 0 0 0 S 0,000 0,000 0:00.00 kworker/0:0H
7 root -2 0 0 0 0 S 0,000 0,000 0:00.00 rcuc/0
8 root -2 0 0 0 0 S 0,000 0,000 0:00.00 rcub/0
9 root 20 0 0 0 0 S 0,000 0,000 0:02.76 rcu_preempt
10 root 20 0 0 0 0 S 0,000 0,000 0:01.00 rcuop/0
11 root 20 0 0 0 0 S 0,000 0,000 0:00.91 rcuop/1
12 root 20 0 0 0 0 S 0,000 0,000 0:00.64 rcuop/2
Clementine playing radio stream
top - 12:47:26 up 13 min, 2 users, load average: 1,44, 1,35, 0,92
Tasks: 231 total, 2 running, 229 sleeping, 0 stopped, 0 zombie
%Cpu(s): 1,0 us, 17,6 sy, 0,0 ni, 81,4 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 6029576 total, 1264724 used, 4764852 free, 78164 buffers
KiB Swap: 6288380 total, 0 used, 6288380 free. 708692 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
93 root 20 0 0 0 0 R 76,41 0,000 0:09.89 kworker/0+
2360 geeko 20 0 2697448 126620 74984 S 2,658 2,100 0:24.33 clementine
563 root 20 0 12036 7372 1564 S 1,329 0,122 0:00.94 haveged
1364 root 20 0 240252 40672 28884 S 0,997 0,675 0:07.95 X
2327 geeko 20 0 691360 30508 24792 S 0,664 0,506 0:01.00 mate-term+
597 root -51 0 0 0 0 S 0,332 0,000 0:06.02 irq/50-iw+
2063 geeko 20 0 521020 28716 21824 S 0,332 0,476 0:02.25 marco
2168 geeko 20 0 412488 22392 18852 S 0,332 0,371 0:01.58 mate-nets+
2358 geeko 20 0 15336 2752 2208 R 0,332 0,046 0:02.11 top
1 root 20 0 35796 5488 3308 S 0,000 0,091 0:02.10 systemd
2 root 20 0 0 0 0 S 0,000 0,000 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0,000 0,000 0:00.01 ksoftirqd+
5 root 0 -20 0 0 0 S 0,000 0,000 0:00.00 kworker/0+
7 root -2 0 0 0 0 S 0,000 0,000 0:00.00 rcuc/0
8 root -2 0 0 0 0 S 0,000 0,000 0:00.00 rcub/0
9 root 20 0 0 0 0 S 0,000 0,000 0:00.78 rcu_preem+
10 root 20 0 0 0 0 S 0,000 0,000 0:00.38 rcuop/0
What can be the cause?