Re: [PATCH v2 1/2] sched: proxy-exec: Close race causing workqueue work being delayed

[Peter Zijlstra <peterz@infradead.org>]

On Fri, May 01, 2026 at 09:25:29PM +0530, K Prateek Nayak wrote:

> > @@ -3685,6 +3691,7 @@ ttwu_stat(struct task_struct *p, int cpu, int wake_flags)
> >   */
> >  static inline void ttwu_do_wakeup(struct task_struct *p)
> >  {
> > +	p->is_blocked = 0;
> 
> I don't think it is this simple at the moment because the proxy bits in
> __schedule() still have to handle PROXY_WAKING and once we clear it here
> task will no longer go through proxy_needs_return() path.
> 
> Clearing of ->is_blocked has to be done at the same point where
> ->blocked_on is cleared although they are set separately.

Argh. Its all a convoluted mess. AFAICT this all goes away when we make
ttwu() do the return migration properly. And then it does work.

So we're now in the situation that things are a bit of a mess, and we
need to make a bigger mess, only to then instantly remove it all again
when we clean up :/

Can't we simply mark PROXY_EXEc broken for a cycle? Its not like the
upstream version has been very functional anyway.