One core 100% used constantly

module0x90 commented 3 years ago

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)

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 commented 3 years ago

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 commented 3 years ago

See here https://github.com/yobasystems/alpine-mariadb/issues/47

yobasystems / alpine-mariadb

One core 100% used constantly #55