Messages in this thread | | | Date | Thu, 7 Apr 2022 03:34:07 +0700 | From | Ammar Faizi <> | Subject | Re: [Linux 5.18-rc1] WARNING: CPU: 1 PID: 0 at kernel/sched/fair.c:3355 update_blocked_averages |
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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
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