From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Paul E. McKenney" Subject: Re: [Bug #16537] TREE_RCU hangs at boot Date: Tue, 21 Sep 2010 11:59:53 -0700 Message-ID: <20100921185953.GA7880@linux.vnet.ibm.com> References: <20100920182626.GE2408@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: <20100920182626.GE2408@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "Rafael J. Wysocki" Cc: Linux Kernel Mailing List , Kernel Testers List , Maciej Rutecki , Rolf Eike Beer On Mon, Sep 20, 2010 at 11:26:27AM -0700, 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 > > Date : 2010-08-07 12:18 (37 days old) > > Handled-By : Paul E. McKenney > > 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? ;-) It turns out that this problem is due to tab processing in the PA-RISC firmware, which certainly explains my inability to reproduce it. It turns out that it is fixed by: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d9b68e5e88248bb24fd4e455588bea1d56108fd6 So we can close this regression. Many thanks to Guy Martin for much help with this!!! Thanx, Paul