From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754572Ab1L1VT1 (ORCPT ); Wed, 28 Dec 2011 16:19:27 -0500 Received: from mail-tul01m020-f174.google.com ([209.85.214.174]:55931 "EHLO mail-tul01m020-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754207Ab1L1VTY (ORCPT ); Wed, 28 Dec 2011 16:19:24 -0500 Date: Wed, 28 Dec 2011 13:19:18 -0800 From: Tejun Heo To: Hugh Dickins Cc: Jens Axboe , Andrew Morton , Stephen Rothwell , linux-next@vger.kernel.org, LKML , linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH block/for-3.3/core] block: an exiting task should be allowed to create io_context Message-ID: <20111228211918.GA3516@google.com> References: <20111222233843.GR17084@google.com> <20111222154427.89b245c7.akpm@linux-foundation.org> <20111222234639.GS17084@google.com> <20111223004244.GU17084@google.com> <20111225010238.GA6013@htj.dyndns.org> <20111228164836.GP17712@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 28, 2011 at 09:55:12AM -0800, Tejun Heo wrote: > Hello, > > On Wed, Dec 28, 2011 at 9:50 AM, Hugh Dickins wrote: > > "It's the tmpfs swapping test that I've been running, with variations, > > for years.  System booted with mem=700M and 1.5G swap, two repetitious > > make -j20 kernel builds (of a 2.6.24 kernel: I stuck with that because > > the balance of built to unbuilt source grows smaller with later kernels), > > one directly in a tmpfs, the other in a 1k-block ext2 (that I drive with > > ext4's CONFIG_EXT4_USE_FOR_EXT23) on /dev/loop0 on a 450MB tmpfs file." > > > > I doubt much of that (quoted from an older mail to someone else about > > one of the many other bugs it's found) is relevant: maybe just plenty > > of file I/O and swapping. > > Plain -j4 build isn't triggering anything. I'll try to replicate the condition. It's not too reliable but I can reproduce it with -j 22 allmodconfig build inside qemu w/ 512M of memory. I'll try to find out what's going on. Thanks. -- tejun