Re: [PATCH v29 5/9] sched: Have try_to_wake_up() handle return-migration for PROXY_WAKING case

[Peter Zijlstra]

On Tue, May 12, 2026 at 02:56:15AM +0000, John Stultz wrote:

>  migrate_task:
>  	proxy_migrate_task(rq, rf, p, owner_cpu);
> @@ -7107,6 +7101,9 @@ static void __sched notrace __schedule(int sched_mode)
>  	if (sched_proxy_exec()) {
>  		struct task_struct *prev_donor = rq->donor;
>  
> +		if (!prev_state && prev->blocked_on)
> +			clear_task_blocked_on(prev, NULL);
> +
>  		rq_set_donor(rq, next);
>  		if (unlikely(next->blocked_on)) {
>  			next = find_proxy_task(rq, next, &rf);

This adds a @prev dereference, after you've just explained how we should
not use @prev after a lock break.