linux-kernel - Re: [Bug #16537] TREE

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Message-ID: <20100920193417.GG2408@linux.vnet.ibm.com>
Date:	Mon, 20 Sep 2010 12:34:17 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Rolf Eike Beer <eike-kernel@...tec.de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>
Subject: Re: [Bug #16537] TREE_RCU hangs at boot

On Mon, Sep 20, 2010 at 09:20:27PM +0200, Rolf Eike Beer wrote:
> Paul E. McKenney wrote:
> > On Sun, Sep 12, 2010 at 09:08:42PM +0200, Rafael J. Wysocki wrote:
> > > This message has been generated automatically as a part of a report
> > > of regressions introduced between 2.6.34 and 2.6.35.
> > > 
> > > The following bug entry is on the current list of known regressions
> > > introduced between 2.6.34 and 2.6.35.  Please verify if it still should
> > > be listed and let the tracking team know (either way).
> > > 
> > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=16537
> > > Subject		: TREE_RCU hangs at boot
> > > Submitter	: Rolf Eike Beer <eike-kernel@...tec.de>
> > > Date		: 2010-08-07 12:18 (37 days old)
> > > Handled-By	: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > 
> > I cannot reproduce this.  The function that is claimed to hang contains
> > only printk()s.  I have asked the guys who can actually reproduce it
> > to try a later kernel, and will let you know how this goes.
> > 
> > If you cannot trust printk(), who can you trust?  ;-)
> 
> I suspect that it is related to:
> 
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.35.y.git;a=commit;h=5a8477871f0b45664eedfa352c3942093408a169
> 
> I'll try to test plain 2.6.35 with this patch and see it this works.

That would explain my utter failure to reproduce this bug -- I don't have
a PA-RISC system.  ;-)

							Thanx, Paul
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