From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Galbraith Subject: Re: rcu stalls running 3.0.1-rt8 Date: Tue, 09 Aug 2011 03:14:28 +0200 Message-ID: <1312852468.5977.10.camel@marge.simson.net> References: <1312580681.28695.44.camel@twins> <1312811718.5896.29.camel@marge.simson.net> <20110808231039.GP4435@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: linux-rt-users , Thomas Gleixner , Peter Zijlstra To: paulmck@linux.vnet.ibm.com Return-path: Received: from mailout-de.gmx.net ([213.165.64.22]:43405 "HELO mailout-de.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750828Ab1HIBPH (ORCPT ); Mon, 8 Aug 2011 21:15:07 -0400 In-Reply-To: <20110808231039.GP4435@linux.vnet.ibm.com> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On Mon, 2011-08-08 at 16:10 -0700, Paul E. McKenney wrote: > On Mon, Aug 08, 2011 at 03:55:18PM +0200, Mike Galbraith wrote: > > Greetings, > > > > I've had no time to tinker with this but though I should get it posted, > > so build latest/greatest to make sure it's still there. It is. > > > > Box can be idling along, and pow. If RCU_BOOST is enabled, I get a hung > > task panic after the stall. If RCU_BOOST is off, and debugging options > > are cut to the bone, box will stay up despite periodic gripes. > > Yow! > > Is this new in -rt8? I wasn't seeing it in earlier versions. Then > again, I was running 32 bits. No, I saw it in earlier releases too. The only thing I've done since first seeing it is a quick build to see if it was still alive, or had died of boredom while waiting for me to come out and play ;-) -Mike