From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756297Ab2FJLE3 (ORCPT ); Sun, 10 Jun 2012 07:04:29 -0400 Received: from ferdi.naasa.net ([87.106.227.76]:46111 "EHLO ferdi.naasa.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754294Ab2FJLE2 (ORCPT ); Sun, 10 Jun 2012 07:04:28 -0400 X-Greylist: delayed 491 seconds by postgrey-1.27 at vger.kernel.org; Sun, 10 Jun 2012 07:04:28 EDT Message-ID: <4FD47D4E.9070307@naasa.net> Date: Sun, 10 Jun 2012 12:56:14 +0200 From: Joerg Platte User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120418 Icedove/11.0 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Kernel 3.4.X NFS regression Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org All 3.4 kernels I tried so far (3.4, 3.4.1 and 3.4.2) suffer from the same NFS related problem: Jun 10 09:23:36 coco kernel: INFO: task kworker/u:1:8 blocked for more than 120 seconds. Jun 10 09:23:36 coco kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Jun 10 09:23:36 coco kernel: kworker/u:1 D 002ba28c 0 8 2 0x00000000 Jun 10 09:23:36 coco kernel: df465ec0 00000046 00000005 002ba28c 00000000 0000000a 00000282 df465e70 Jun 10 09:23:36 coco kernel: df465ec0 df44d2b0 ffff6b60 df465e84 df44d2b0 e33fa6b3 00000282 de764ae0 Jun 10 09:23:36 coco kernel: ffffffff d78bcfb8 df465e8c c012e0f6 df465ea4 c013610c 00000000 d78bcf80 Jun 10 09:23:36 coco kernel: Call Trace: Jun 10 09:23:36 coco kernel: [] ? add_timer+0x11/0x17 Jun 10 09:23:36 coco kernel: [] ? queue_delayed_work_on+0x74/0xf0 Jun 10 09:23:36 coco kernel: [] ? queue_delayed_work+0x1b/0x28 Jun 10 09:23:36 coco kernel: [] schedule+0x1d/0x4c Jun 10 09:23:36 coco kernel: [] cld_pipe_upcall+0x4e/0x75 [nfsd] Jun 10 09:23:36 coco kernel: [] nfsd4_cld_grace_done+0x60/0x99 [nfsd] Jun 10 09:23:36 coco kernel: [] nfsd4_record_grace_done+0x10/0x12 [nfsd] Jun 10 09:23:36 coco kernel: [] laundromat_main+0x291/0x2d8 [nfsd] Jun 10 09:23:36 coco kernel: [] process_one_work+0xff/0x325 Jun 10 09:23:36 coco kernel: [] ? start_worker+0x20/0x23 Jun 10 09:23:36 coco kernel: [] ? nfsd4_process_open1+0x32b/0x32b [nfsd] Jun 10 09:23:36 coco kernel: [] worker_thread+0xf4/0x39a Jun 10 09:23:36 coco kernel: [] ? rescuer_thread+0x231/0x231 Jun 10 09:23:36 coco kernel: [] kthread+0x6c/0x6e Jun 10 09:23:36 coco kernel: [] ? kthreadd+0xe8/0xe8 Jun 10 09:23:36 coco kernel: [] kernel_thread_helper+0x6/0xd A kworker task is stuck in D state and nfs mounts from other clients do not work at all. This happens only on one machine, another one with the same kernel (same self compiled Debian package) works. All previous 3.3 kernels work as well. Since this machine is remote it is not that easy to bisect to find the bad commit. Are there any other things I can try? regards, Joerg