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

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Message-ID: <500D9BFC.9090707@fold.natur.cuni.cz>
Date:	Mon, 23 Jul 2012 20:46:20 +0200
From:	Martin Mokrejs <mmokrejs@...d.natur.cuni.cz>
To:	Mike Galbraith <mgalbraith@...ell.com>
CC:	Michael Wang <wangyun@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	mmokrejs@...d.natur.cuni.cz, dan.carpenter@...cle.com
Subject: Re: [QUESTION ON BUG] the rcu stall issue could not be reproduced

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.
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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