On 5/30/23 10:58 AM, Mike Christie wrote: > On 5/30/23 8:44 AM, Stefano Garzarella wrote: >> >> From a first glance, it looks like an issue when we call vhost_work_queue(). >> @Mike, does that ring any bells since you recently looked at that code? > > I see the bug. needed to have set the dev->worker after setting worker->vtsk > like below: > > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index a92af08e7864..7bd95984a501 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -564,7 +564,6 @@ static int vhost_worker_create(struct vhost_dev *dev) > if (!worker) > return -ENOMEM; > > - dev->worker = worker; > worker->kcov_handle = kcov_common_handle(); > init_llist_head(&worker->work_list); > snprintf(name, sizeof(name), "vhost-%d", current->pid); > @@ -576,6 +575,7 @@ static int vhost_worker_create(struct vhost_dev *dev) > } > > worker->vtsk = vtsk; Shoot, oh wait, I think I needed a smp_wmb to always make sure worker->vtask is set before dev->worker or vhost_work_queue could still end up seeing dev->worker set before worker->vtsk right? > + dev->worker = worker;> vhost_task_start(vtsk); > return 0; >
