Re: [PATCH v2 0/3] vhost_task: Fix a bug where KVM wakes an exited task

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Aug 27, 2025 at 10:10:59PM +0200, Sebastian Andrzej Siewior wrote:
> On 2025-08-27 12:41:04 [-0700], Sean Christopherson wrote:
> > Michael,
> 
> Sean,
> 
> would the bellow work by chance? It is a quick shot but it looks
> symmetrical…
> 
> diff --git a/kernel/vhost_task.c b/kernel/vhost_task.c
> index bc738fa90c1d6..27107dcc1cbfe 100644
> --- a/kernel/vhost_task.c
> +++ b/kernel/vhost_task.c
> @@ -100,6 +100,7 @@ void vhost_task_stop(struct vhost_task *vtsk)
>  	 * freeing it below.
>  	 */
>  	wait_for_completion(&vtsk->exited);
> +	put_task_struct(vtsk->task);
>  	kfree(vtsk);
>  }
>  EXPORT_SYMBOL_GPL(vhost_task_stop);
> @@ -148,7 +149,7 @@ struct vhost_task *vhost_task_create(bool (*fn)(void *),
>  		return ERR_CAST(tsk);
>  	}
>  
> -	vtsk->task = tsk;
> +	vtsk->task = get_task_struct(tsk);
>  	return vtsk;
>  }
>  EXPORT_SYMBOL_GPL(vhost_task_create);
> 
> Sebastian


So how about switching to this approach then?
Instead of piling up fixes like we seem to do now ...
Sean?

-- 
MST