1 Core almost 100% after system upgrade (kworker/1:0+events_freezable_power_ ?)

[destroyedlolo]

Hello,

 

I'm running Armbian on the original (LeMaker) A20 powered BananaPI :

 cat /etc/issue
Armbian 21.08.6 Buster \l 

 

I did an apt-get upgrade few days back, and since, it's CPU load is always around 1.00 even if I don't run my custom application (obviously, it wasn't the case before).

Nothing special in /var/logs/messages, but top show me a kernel process always on top :

top - 15:03:43 up 1 day, 17:40,  1 user,  load average: 0,98, 1,03, 1,12
Tasks: 112 total,   2 running, 110 sleeping,   0 stopped,   0 zombie
%Cpu(s):  4,5 us,  6,3 sy,  0,0 ni, 89,0 id,  0,0 wa,  0,0 hi,  0,2 si,  0,0 st
MiB Mem :    993,9 total,    583,3 free,    119,7 used,    291,0 buff/cache
MiB Swap:    497,0 total,    497,0 free,      0,0 used.    840,4 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                        
26647 root      20   0       0      0      0 R  10,3   0,0   1:44.71 kworker/1:0+events_freezable_power_            
32375 laurent   20   0  103912  51264   5472 S  10,3   5,0   1:20.54 Selene                                         
 3664 laurent   20   0    7588   2372   2016 R   0,7   0,2   0:01.23 top                                            
   14 root      20   0       0      0      0 I   0,3   0,0   2:55.81 rcu_sched                                      
 1927 root      20   0    1408    336    292 S   0,3   0,0  10:37.20 BananaLEDd                                     
31455 root      20   0       0      0      0 I   0,3   0,0   0:00.26 kworker/1:3-mm_percpu_wq        

 

I did some googling but it doesn't help to find out what is this events_freezable_power_

 

In another hand, it doesn't explain this 1.00 load as you can see it consums only 10 to 15% of the CPU as well as my own custom application.

 

So any tip, help, whatever is welcome.

 

Thanks

[hexdump]

not sure if it is related, but there was something similar in the past - see:

 

[Werner]

This happened several times over the past years across almost all SoCs. Personally I discovered this first on the OPi1+ with H6 SoC and vendor images. Now I notice this on RK3588 when using 5.10.160 (rk4.1 branch and up)  kernel...

[destroyedlolo]

Thanks for links.

 

I'm not concerned by AR-305 as I have an HDMI attached (It's my home automation dashboard, images you can see on my Twitter profile). But i don't have a SATA disk on this machine.

 

The only google hits I found about this issue is related to disk access : as the only one I have is the SD card, I'm a bit fearing about its duration. But nothing is clear about this particular kworker : what is its goal ?