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 ESMTP id 40D418D0039 for ; Mon, 31 Jan 2011 18:20:09 -0500 (EST) Received: from d01dlp01.pok.ibm.com (d01dlp01.pok.ibm.com [9.56.224.56]) by e4.ny.us.ibm.com (8.14.4/8.13.1) with ESMTP id p0VN1iCL024634 for ; Mon, 31 Jan 2011 18:01:45 -0500 Received: from d01relay03.pok.ibm.com (d01relay03.pok.ibm.com [9.56.227.235]) by d01dlp01.pok.ibm.com (Postfix) with ESMTP id 99A2572805B for ; Mon, 31 Jan 2011 18:20:06 -0500 (EST) Received: from d01av01.pok.ibm.com (d01av01.pok.ibm.com [9.56.224.215]) by d01relay03.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p0VNK6nt336396 for ; Mon, 31 Jan 2011 18:20:06 -0500 Received: from d01av01.pok.ibm.com (loopback [127.0.0.1]) by d01av01.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p0VNK6UR031505 for ; Mon, 31 Jan 2011 18:20:06 -0500 Subject: Re: kswapd hung tasks in 2.6.38-rc1 From: Dave Hansen In-Reply-To: <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> <20110131231301.GP16981@random.random> Content-Type: text/plain; charset="ANSI_X3.4-1968" Date: Mon, 31 Jan 2011 15:20:03 -0800 Message-ID: <1296516003.7797.5061.camel@nimitz> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Andrea Arcangeli Cc: CAI Qian , linux-mm , linux-kernel@vger.kernel.org List-ID: On Tue, 2011-02-01 at 00:13 +0100, Andrea Arcangeli wrote: > 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 try to get a sysrq-l dump. > > 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. Nope: $ grep PROVE ../mhp-build/x86_64-elm3b82/.config # CONFIG_PROVE_LOCKING is not set Full .config is here http://sr71.net/~dave/ibm/config-v2.6.38-rc2 -- Dave -- 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