Subject: Re: [ppc64] 2.6.29-git7 : offlining a cpu causes an exception

From: Sachin Sant <[email-masked]>
Date: Thu, 16 Apr 2009 11:06:52 +0530

Sachin Sant wrote:
> Sachin Sant wrote:
>> Benjamin Herrenschmidt wrote:
>>> On Tue, 2009-03-31 at 14:57 +0530, Sachin Sant wrote:
>>>  
>>>> While executing CPU HotPlug[1] tests i observed that during
>>>> every cpu offline process an exception is thrown.
>>>>     
>>>
>>> Looks like a BUG_ON() to me... can you look at what other
>>> messages just before that ?  
>>
> Ben, seems like the following patch is causing the cpu hotplug
> test failure.
> [PATCH 6/6] powerpc/mm: Introduce early_init_mmu() on 64-bit
>
> http://ozlabs.org/pipermail/linuxppc-dev/2009-March/069613.html
>
> If i back out this patch, i am able to offline/online cpu's
> without any issue.
I can recreate this problem with 2.6.30-rc2-git1 as well. Same BUG_ON while
running cpu hotplug tests.

Let me know if there is any thing i can help to find a fix for this.

Thanks
-Sachin

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Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
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