From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 4F0B58D0039 for ; Mon, 31 Jan 2011 18:13:04 -0500 (EST) Date: Tue, 1 Feb 2011 00:13:01 +0100 From: Andrea Arcangeli Subject: Re: kswapd hung tasks in 2.6.38-rc1 Message-ID: <20110131231301.GP16981@random.random> References: <1150342867.83404.1295513748640.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> <1296507528.7797.4609.camel@nimitz> <1296513616.7797.4929.camel@nimitz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1296513616.7797.4929.camel@nimitz> Sender: owner-linux-mm@kvack.org To: Dave Hansen Cc: CAI Qian , linux-mm , linux-kernel@vger.kernel.org List-ID: On Mon, Jan 31, 2011 at 02:40:16PM -0800, Dave Hansen wrote: > Still not a very good data point, but I ran a heavy swap load for an > hour or so without reproducing this. But, it happened again after I > enabled transparent huge pages. I managed to get a sysrq-t dump out of > it: > > http://sr71.net/~dave/ibm/2.6.38-rc2-hang-0.txt > > khugepaged is one of the three running tasks. Note, I set both its > sleep timeouts to zero to stress it out a bit. sysrq+l? sysrq+t doesn't provide interesting info for running tasks. > I'll keep trying to reproduce without THP. BTW, do you have prove locking enabled? With recent git I get a deadlock inside _raw_spin_unlock_irq with prove locking enabled and it goes away when I disable it. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org