On 04/11/2013 03:19 AM, Thomas Gleixner wrote:
> --- linux-2.6.orig/kernel/smpboot.c
> +++ linux-2.6/kernel/smpboot.c
> @@ -185,8 +185,18 @@ __smpboot_create_thread(struct smp_hotpl
> }
> get_task_struct(tsk);
> *per_cpu_ptr(ht->store, cpu) = tsk;
> - if (ht->create)
> - ht->create(cpu);
> + if (ht->create) {
> + /*
> + * Make sure that the task has actually scheduled out
> + * into park position, before calling the create
> + * callback. At least the migration thread callback
> + * requires that the task is off the runqueue.
> + */
> + if (!wait_task_inactive(tsk, TASK_PARKED))
> + WARN_ON(1);
> + else
> + ht->create(cpu);
> + }
> return 0;
> }
This one appears to be doing the trick. I'll run the cpus in an
online/offline loop for a bit and make sure it's stable. It's passed
several round so far, which is way more than it's done up to this point,
though.
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