Re: [PATCH] uprobes: Fix race in uprobe_free_utask

[Oleg Nesterov]

On 01/09, Jiri Olsa wrote:
>
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -1915,6 +1915,7 @@ void uprobe_free_utask(struct task_struct *t)
>       if (!utask)
>               return;
>
> +     t->utask = NULL;
>       WARN_ON_ONCE(utask->active_uprobe || utask->xol_vaddr);
>
>       timer_delete_sync(&utask->ri_timer);
> @@ -1924,7 +1925,6 @@ void uprobe_free_utask(struct task_struct *t)
>               ri = free_ret_instance(ri, true /* cleanup_hprobe */);
>
>       kfree(utask);
> -     t->utask = NULL;

Acked-by: Oleg Nesterov <o...@redhat.com>