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

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Message-ID: <500DF828.3050102@linux.vnet.ibm.com>
Date:	Tue, 24 Jul 2012 09:19:36 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	Martin Mokrejs <mmokrejs@...d.natur.cuni.cz>
CC:	Mike Galbraith <mgalbraith@...ell.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	dan.carpenter@...cle.com
Subject: Re: [QUESTION ON BUG] the rcu stall issue could not be reproduced

On 07/24/2012 02:46 AM, Martin Mokrejs wrote:
> Hi,
>   I see few more RCU bugs reported in bugzilla:
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=43028
> https://bugzilla.kernel.org/show_bug.cgi?id=40092
> https://bugzilla.kernel.org/show_bug.cgi?id=42997
> 
> And, I placed my previous long email with logs at
> https://bugzilla.kernel.org/show_bug.cgi?id=45091
> 
> Hope this helps eventually once.

That's very helpful, I need some time to read and think about it, thanks
for the info ;-)

Regards,
Michael Wang
> Martin
> 
> Mike Galbraith wrote:
>> On Fri, 2012-07-20 at 11:09 +0800, Michael Wang wrote: 
>>> Hi, Mike, Martin, Dan
>>>
>>> I'm currently taking an eye on the rcu stall issue which was reported by
>>> you in the mail:
>>>
>>> rcu: endless stalls
>>> 	From: Mike Galbraith
>>> linux-3.4-rc7: rcu_sched self-detected stall on CPU
>>> 	From: Martin Mokrejs
>>> RCU stalls in linux-next
>>> 	From: Dan Carpenter
>>>
>>> I try to reproduce the issue on my X86 server with 12 cpu
>>
>> The 'endless stalls' box was 341.33333 times larger.  Dunno if you can
>> even set a serial port slow enough to approximate all cores trying to
>> gripe through a single pinhole simultaneously.
>>
>> -Mike
>>
>>
> 
> 


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