Re: [PATCH v2 -next] cgroup: remove offline draining in root destruction to avoid hung_tasks

[Michal Koutný]

Hi Ridong.

On Thu, Jul 31, 2025 at 07:53:02PM +0800, Chen Ridong <chenridong@xxxxxxxxxxxxxxx> wrote:
> Have you come up with a better solution for this?
> Would appreciate your thoughts when you have time.

Sorry for taking so long. (Also expect my next response here may be
slow.)
I tried reproducing it with the described LTP tests [1] (to get a better
idea about what and why needs to be offlined) but I cannot bring it to a
hang nor lockdep report. How do you launch the particular LTP tests to
trigger this?

Thanks,
Michal

[1]
while true ; do
	/opt/ltp/testcases/bin/cgroup_fj_function.sh net_cls $pp
	/opt/ltp/testcases/bin/cgroup_fj_function.sh perf_event
done
(with pp both `;` or `&` for concurrent runs, two vCPUs)

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