Yiyang Chen

`hw/9pfs/virtio-9p.c` also need to include on my OS Ubuntu 20.04 (5.11.0-38-generic).

Please assign to me.

This issue is fixed and can be closed now.

@liubin @ManaSugi Please review code.

Hey @YJDoc2., thanks for your reply! I'm willing to fix this issue. I will firstly deal with the bug of `kill --force` under cgroup v1. Maybe some time later I...

@YJDoc2 Sorry for the slow progress, I've been preparing for job applications recently. Integration tests is still in development.

I might know why integration test TestContainerKillInitPidHost fails. I output command lines of each execution of youki: ```text runc --root /run/containerd/runc/testing --log /run/containerd-test/io.containerd.runtime.v2.task/testing/TestContainerKillInitPidHost/log.json --log-format json create --bundle /run/containerd-test/io.containerd.runtime.v2.task/testing/TestContainerKillInitPidHost --pid-file /run/containerd-test/io.containerd.runtime.v2.task/testing/TestContainerKillInitPidHost/init.pid...

The latest commit seems to be able to pass `TestContainerKillInitPidHost ` and `TestContainerKillInitKillsChildWhenNotHostPid`. cc @YJDoc2

https://github.com/containers/youki/blob/6d05dd2f60198aaecb7c93d08c08d7db4fbc6600/crates/liboci-cli/src/kill.rs#L5-L11 @YJDoc2 Thanks for your review! It seems that the `--all` option has been added to the liboci-cli before. And I have changed some `exit(0)` to return `Ok(())`.

> > @adrianreber will go into the namespace using "nsenter -t container_PID --net bash", and mount from inside of the namespace work? > > This just enters the network namespace,...