From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on gnuweeb.org X-Spam-Level: X-Spam-Status: No, score=-1.8 required=5.0 tests=ALL_TRUSTED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,NO_DNS_FOR_FROM, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 Received: from [192.168.223.80] (unknown [114.10.20.104]) by gnuweeb.org (Postfix) with ESMTPSA id 1AAB37E357; Wed, 6 Apr 2022 20:34:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gnuweeb.org; s=default; t=1649277257; bh=fyeTyT6/sVCNXUxxthqtTBSMElMjKCqGdhSXrfEBdd4=; h=Date:To:Cc:References:From:Subject:In-Reply-To:From; b=lMxze+V+T3fViuSilMbSZOB5mkR4y/gtgIj4t+K5kOU+OLi0Fi2iqcSikEeCKQEoj RLjku6+IazQFqgU/ZPVGA9BJvNNFiv7T/hWu8nRCwQxpaSw7SPW4tH9uWZzO5FkwvJ rX+cmgxDum+YW3DK04dEcZh5FMUzyZjXx8xttJ33whfopbWgP/0YHdUZ7jcIEQL20G MCvhxhnwmpzw+KYOC6E2fIksjMarL3NlfrPMzpmOFI5850KYV5p4lXPjWUUgfAiwsd Zp2sH8ztQMv5JJ4dxG+MNrJ1IVQM6P9FxqUF4KOv5o22N3ESfumgDwmU7WBWs+q4Hy dTKxS6L4DNyWA== Message-ID: <7f4b3fbf-c7c6-22cb-019b-520ad6a663aa@gnuweeb.org> Date: Thu, 7 Apr 2022 03:34:07 +0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Content-Language: en-US To: Dietmar Eggemann , Linux Kernel Mailing List Cc: Ben Segall , Daniel Bristot de Oliveira , GNU/Weeb Mailing List , Ingo Molnar , Juri Lelli , Mel Gorman , Peter Zijlstra , Steven Rostedt , Vincent Guittot References: <675544de-3369-e26e-65ba-3b28fff5c126@gnuweeb.org> <000457c2-57af-95e3-7dff-2cbd99f0de5f@arm.com> From: Ammar Faizi Subject: Re: [Linux 5.18-rc1] WARNING: CPU: 1 PID: 0 at kernel/sched/fair.c:3355 update_blocked_averages In-Reply-To: <000457c2-57af-95e3-7dff-2cbd99f0de5f@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit List-Id: On 4/6/22 7:21 PM, Dietmar Eggemann wrote: > On 05/04/2022 15:13, Ammar Faizi wrote: >> On 4/5/22 7:21 PM, Dietmar Eggemann wrote: >>> Tried to recreate the issue but no success so far. I used you config >>> file, clang-14 and a Xeon CPU E5-2690 v2 (2 sockets 40 CPUs) with 20 >>> two-level cgoupv1 taskgroups '/X/Y' with 'hackbench (10 groups, 40 fds) >>> + idling' running in all '/X/Y/'. >>> >>> What userspace are you running? >> >> HP Laptop, Intel i7-1165G7, 8 CPUs, with 16 GB of RAM. Ubuntu 21.10. >> Just for >> daily workstation. Compiling kernel, browsing and coding stuff. > > Can you check that CFS Bandwidth control (CONFIG_CFS_BANDWIDTH=y) is > still not used on Ubuntu desktop 21.10? > > It shouldn't but I can't verify since I'm still on 20.04 LTS Desktop: > > $ mount | grep "cgroup2\|\bcpu\b" > cgroup2 on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate) > cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct) > > CPU controller is still used in cgroupv1. So cgroupv2 can't use it: > > $ cat /sys/fs/cgroup/unified/cgroup.controllers > /* empty */ > > And there is no cgroupv1 hierarchy under /sys/fs/cgroup/cpu,cpuacct/ . > > No cpu.cfs_quota_us files with something other than -1. > > So CFS Bandwidth control is not used. Not familiar with CFS stuff, but here... =============== ammarfaizi2@integral2:~$ mount | grep "cgroup2\|\bcpu\b" cgroup2 on /sys/fs/cgroup type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot) ammarfaizi2@integral2:~$ cat /sys/fs/cgroup/unified/cgroup.controllers cat: /sys/fs/cgroup/unified/cgroup.controllers: No such file or directory ammarfaizi2@integral2:~$ ls /sys/fs/cgroup/{cpu,cpuacct} ls: cannot access '/sys/fs/cgroup/cpu': No such file or directory ls: cannot access '/sys/fs/cgroup/cpuacct': No such file or directory ammarfaizi2@integral2:~$ ammarfaizi2@integral2:~$ cat /etc/os-release PRETTY_NAME="Ubuntu 21.10" NAME="Ubuntu" VERSION_ID="21.10" VERSION="21.10 (Impish Indri)" VERSION_CODENAME=impish ID=ubuntu ID_LIKE=debian HOME_URL="https://www.ubuntu.com/" SUPPORT_URL="https://help.ubuntu.com/" BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/" PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy" UBUNTU_CODENAME=impish ammarfaizi2@integral2:~$ =============== Update: So far I have been using and torturing my machine for a day, but still couldn't reproduce the issue. It seems I hit a rarely happened bug. I will continue using this until 5.18-rc2 before recompile my kernel. -- Ammar Faizi