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

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Message-ID: <20110720133443.GG2400@linux.vnet.ibm.com>
Date:	Wed, 20 Jul 2011 06:34:43 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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, greearb@...delatech.com,
	edward.tomlinson@...o.bombardier.com
Subject: Re: [PATCH rcu/urgent 0/6] Fixes for RCU/scheduler/irq-threads
 trainwreck

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.

> I've merged the pathname lookup fix. I was hoping all the RCU issues
> were behind us..

If we have time, I would like to see what Ed gets with the most recent
fix.  If we absolutely need to release today, then I will push patches
2,5,6 which are covering Ed's particular situation.  My concern with doing
so is that other failures might pop up.

							Thanx, Paul
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