linux-kernel - Re: [QUESTION ON BUG] the rcu stall issue could not be reproduced

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Date:	Fri, 20 Jul 2012 16:53:09 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	mgalbraith@...ell.com, mmokrejs@...d.natur.cuni.cz
Subject: Re: [QUESTION ON BUG] the rcu stall issue could not be reproduced

On 07/20/2012 04:36 PM, Dan Carpenter wrote:
> On Fri, Jul 20, 2012 at 04:24:25PM +0800, Michael Wang wrote:
>> On 07/20/2012 02:41 PM, Dan Carpenter wrote:
>>> My bug was fixed in March.  There was an email thread about it when
>>> the merge window opened but I can't find it...
>> Hi, Dan
>>
>> Thanks for your reply.
>>
>> Currently this issue won't appear because the
>> CONFIG_RCU_CPU_STALL_TIMEOUT=60, which is big enough to avoid the
>> warning info.
>>
>> So is this the fix you mentioned? or someone has find out the true
>> reason and fixed it?
> 
> I don't think there was an email thread on the RCU stall issue after
> all.  I'm not sure what how it was fixed.
> 
> The 60 second time out would have still triggered with my bug.  It
> was a complete system hang, the RCU stall message was just a
> debugging hint.  I was hitting the bug every couple days reliably on
> all my systems.

I see, looks like the stall info in your case is caused by a different
reason which should already be handled.

I do think that this warning won't appear with a normal machine working
normally without any buggie driver or wrong deployment...

Let's see what I can get from other reporters ;-)

Regards,
Michael Wang
> 
> regards,
> dan carpenter
> 


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