From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758918Ab0EDMtx (ORCPT ); Tue, 4 May 2010 08:49:53 -0400 Received: from keetweej.vanheusden.com ([83.163.219.98]:33452 "EHLO keetweej.vanheusden.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752958Ab0EDMtw (ORCPT ); Tue, 4 May 2010 08:49:52 -0400 Date: Tue, 4 May 2010 14:49:50 +0200 From: Folkert van Heusden To: linux-kernel@vger.kernel.org Subject: [2.6.32] task hung Message-ID: <20100504124950.GK29057@vanheusden.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Organization: www.unixexpert.nl X-Chameleon-Return-To: folkert@vanheusden.com X-Xfmail-Return-To: folkert@vanheusden.com X-Phonenumber: +31-6-41278122 X-URL: http://www.vanheusden.com/ X-PGP-KeyID: 1F28D8AE X-GPG-fingerprint: AC89 09CE 41F2 00B4 FCF2 B174 3019 0E8C 1F28 D8AE X-Key: http://pgp.surfnet.nl:11371/pks/lookup?op=get&search=0x1F28D8AE Read-Receipt-To: Reply-By: Mon May 3 22:59:23 CEST 2010 X-Message-Flag: www.unixexpert.nl User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, I'm copying 6GB of data onto an NBD device using a simple tool which differs from dd/cat in that it measures how long it takes to write each block and does a sync after each block. Now during that run I get: [45480.665074] INFO: task measurecopy:13780 blocked for more than 120 seconds. [45480.665086] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [45480.665090] measurecopy D 0000000000000000 0 13780 30341 0x00000000 [45480.665102] ffff8801bf06d4c0 0000000000000082 0000000000000000 ffff8801776d9d04 [45480.665116] 0000000000000001 ffff88000000f640 000000000000f8a0 ffff8801776d9fd8 [45480.665129] 00000000000155c0 00000000000155c0 ffff8801a867d4c0 ffff8801a867d7b8 [45480.665143] Call Trace: [45480.665153] [] ? ktime_get_ts+0x68/0xb2 [45480.665159] [] ? delayacct_end+0x74/0x7f [45480.665168] [] ? sync_page+0x0/0x46 [45480.665175] [] ? io_schedule+0x73/0xb7 [45480.665181] [] ? sync_page+0x41/0x46 [45480.665186] [] ? __wait_on_bit+0x41/0x70 [45480.665192] [] ? wait_on_page_bit+0x6b/0x71 [45480.665199] [] ? wake_bit_function+0x0/0x23 [45480.665206] [] ? pagevec_lookup_tag+0x1a/0x21 [45480.665212] [] ? wait_on_page_writeback_range+0x69/0x11b [45480.665218] [] ? filemap_write_and_wait_range+0x43/0x52 [45480.665225] [] ? vfs_fsync_range+0x55/0x9e [45480.665231] [] ? do_fsync+0x28/0x39 [45480.665236] [] ? sys_fdatasync+0xe/0x13 [45480.665243] [] ? system_call_fastpath+0x16/0x1b command line: ./measurecopy -i /dev/VG01/LVHOME -o /dev/nbd0 -s -b 1048576 http://www.vanheusden.com/measurecopy/ Folkert van Heusden -- Feeling generous? -> http://www.vanheusden.com/wishlist.php ---------------------------------------------------------------------- Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com