On Wed, Dec 15, 2021 at 10:27 AM Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > So the issue is that the kthread_stop happens around the time > exit_task_work() destroys the VM, but the process can go on and signal > its demise to the parent process before the kthread has been completely > dropped. Not even close() can fix it, though it may reduce the window > completely, so I agree that this is a bug and vhost has the same bug too. > > Due to the issue with kthreadd_task not being exported, perhaps you can > change cgroup_attach_task_all to use kthreadd_task if the "from" > argument is NULL? Thanks for the suggestion. This also works, I will send out a patch.
