Re: stalling IO regression in linux 5.12

Chris Murphy
2022-08-10T19:35:12Z

On Wed, Aug 10, 2022, at 2:42 PM, Chris Murphy wrote:
> On Wed, Aug 10, 2022, at 2:33 PM, Chris Murphy wrote:
>> On Wed, Aug 10, 2022, at 1:48 PM, Josef Bacik wrote:
>>
>>> To help narrow this down can you disable any IO controller you've got enabled
>>> and see if you can reproduce? If you can sysrq+w is super helpful as it'll
>>> point us in the next direction to look. Thanks,
>>
>> I'm not following, sorry. I can boot with
>> systemd.unified_cgroup_hierarchy=0 to make sure it's all off, but we're
>> not using an IO cgroup controllers specifically as far as I'm aware.
>
> OK yeah that won't work because the workload requires cgroup2 or it won't run.

Booted with cgroup_disable=io, and confirmed cat /sys/fs/cgroup/cgroup.controllers does not list io.

I'll rerun the workload now. Sometimes reproduces fast, other times a couple hours.

--
Chris Murphy