One core 100% used constantly

[module0x90]

Since an earlier version, couple of months back I have this container using 1 core only. I am using Nextcloud and that doesn't work as it can't talk to the DB.

Inside the container (RPi 4B) I can see

Mem: 5508532K used, 2555748K free, 301724K shrd, 159588K buff, 4897740K cached
CPU: 2% usr 24% sys 0% nic 73% idle 0% io 0% irq 0% sirq
Load average: 1.01 1.56 1.69 2/359 16
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
1 0 root R 30368 0% 3 25% /usr/bin/mysqld --user=mysql --console --skip-name-resolve --skip-networking=0 --transaction-isolation=READ-COMMITTED --binlog-format=ROW
9 0 root S 1744 0% 2 0% /bin/sh
16 9 root R 1708 0% 1 0% top

Outside - it is shown as 100% CPU.

When I do an strace outside the container of the process inside as root:

syscall_0x193(0x6, 0xbea169d0, 0x6, 0xe40e7c, 0xc91521a4, 0) = -1 EPERM (Operation not permitted)
syscall_0x193(0x6, 0xbea169d0, 0x6, 0xe40e7c, 0, 0) = -1 EPERM (Operation not permitted)
syscall_0x193(0x6, 0xbea169d0, 0x6, 0xe40e7c, 0xc91521a4, 0) = -1 EPERM (Operation not permitted)
syscall_0x193(0x6, 0xbea169d0, 0x6, 0xe40e7c, 0, 0) = -1 EPERM (Operation not permitted)

Seems to be related with
https://forum.armbian.com/topic/13737-focal-continously-changing-system-time/
Mailu/Mailu#1752

This container was working just fine at some point... suddenly it was always on 100% and never responds.

Linux docker 5.10.17-v7l+ #1421 SMP Thu May 27 14:00:13 BST 2021 armv7l GNU/Linux
Raspbian Buster, up2date, no updates outstanding.

Any thoughts?

[dominictayloruk]

32bit kernel on Raspberry Pi 4??

Linux docker 5.10.17-v7l+ #1421 SMP Thu May 27 14:00:13 BST 2021 armv7l GNU/Linux

Use a 64bit kernel. Problem solved

[dominictayloruk]

See here #47