linux-kernel - Re: [PATCH rcu/urgent 0/6] Fixes for RCU/scheduler/irq-threads trainwreck

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Message-ID: <4E270A0E.6090902@candelatech.com>
Date:	Wed, 20 Jul 2011 10:02:06 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ed Tomlinson <edt@....ca>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org, edward.tomlinson@...o.bombardier.com
Subject: Re: [PATCH rcu/urgent 0/6] Fixes for RCU/scheduler/irq-threads trainwreck

On 07/20/2011 06:34 AM, Paul E. McKenney wrote:
> On Tue, Jul 19, 2011 at 10:03:05PM -0700, Linus Torvalds wrote:
>> On Tue, Jul 19, 2011 at 9:44 PM, Paul E. McKenney
>> <paulmck@...ux.vnet.ibm.com>  wrote:
>>> On Tue, Jul 19, 2011 at 10:07:32PM -0400, Ed Tomlinson wrote:
>>>> On Tuesday 19 July 2011 21:30:00 Ed Tomlinson wrote:
>>>>> On Tuesday 19 July 2011 20:17:38 Paul E. McKenney wrote:
>>>>
>>>> Paul,
>>>>
>>>> Two things to add.  Its possible an eariler error is missing from the log below.  My serial console was missing
>>>> entries from before '0 and 40ish' and I did think I saw a bunch of FFFFFFFs scroll by eariler...
>>>>
>>>> Second, booting with threadirqs and boost enabled in .config with patches 2,5,6 is ok so far.
>>>
>>> Patches 3 and 4 resulted in failures?  (Patch 1 certainly did.)
>>
>> Gaah. Any possibility of getting this resolved soon?
>
> I believe that we are very close.  These failures all involve unusual
> configurations, which is why they showed up so late.

What is strange about my configuration?  Just that I enabled the
RCU boost and other new RCU features?

Surely it's not that I'm just doing lots of mounts and unmounts
and file-io with lots of processes....

And I was posting lockdep warnings on this since -rc1 or so, though granted
I was running a few extra patches and having other bugs at the same time....

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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