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SubjectRe: [BUG 2.6.25-rc3] scheduler/hotplug: some processes are dealocked when cpu is set to offline
On 03/03/2008, Ingo Molnar <mingo@elte.hu> wrote:
>
> * Dmitry Adamushko <dmitry.adamushko@gmail.com> wrote:
>
> > per_cpu(watchdog_task, hotcpu) = NULL;
> > + mlseep(1);
>
>
> that wont build very well ...

yeah, I forgot to mention that it's not even compile-tested :-/
I re-created it from scratch instead of looking for the original one.

please, this one (again, not compile-tested)

--- softlockup-prev-2.c 2008-03-03 12:38:36.000000000 +0100
+++ softlockup.c 2008-03-03 13:00:20.000000000 +0100
@@ -294,6 +294,7 @@ cpu_callback(struct notifier_block *nfb,
case CPU_DEAD_FROZEN:
p = per_cpu(watchdog_task, hotcpu);
per_cpu(watchdog_task, hotcpu) = NULL;
+ msleep(1);
kthread_stop(p);
break;
#endif /* CONFIG_HOTPLUG_CPU */

--
Best regards,
Dmitry Adamushko
--- softlockup-prev-2.c 2008-03-03 12:38:36.000000000 +0100
+++ softlockup.c 2008-03-03 13:00:20.000000000 +0100
@@ -294,6 +294,7 @@ cpu_callback(struct notifier_block *nfb,
case CPU_DEAD_FROZEN:
p = per_cpu(watchdog_task, hotcpu);
per_cpu(watchdog_task, hotcpu) = NULL;
+ msleep(1);
kthread_stop(p);
break;
#endif /* CONFIG_HOTPLUG_CPU */
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