linux-kernel - Re: [BUG 2.6.25-rc3] scheduler/hotplug: some processes are dealocked when cpu is set to offline

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Date:	Mon, 3 Mar 2008 13:02:51 +0100
From:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>
To:	yi.y.yang@...el.com
Cc:	"Ingo Molnar" <mingo@...e.hu>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG 2.6.25-rc3] scheduler/hotplug: some processes are dealocked when cpu is set to offline

On 03/03/2008, Ingo Molnar <mingo@...e.hu> wrote:
>
>  * Dmitry Adamushko <dmitry.adamushko@...il.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

View attachment "softlockup-debug-2.patch" of type "text/x-patch" (356 bytes)