Messages in this thread | | | Date | Wed, 6 Apr 2022 14:21:19 +0200 | Subject | Re: [Linux 5.18-rc1] WARNING: CPU: 1 PID: 0 at kernel/sched/fair.c:3355 update_blocked_averages | From | Dietmar Eggemann <> |
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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.
[...]
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