Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752599Ab1DPSZe (ORCPT ); Sat, 16 Apr 2011 14:25:34 -0400 Received: from mx2.fusionio.com ([64.244.102.31]:59755 "EHLO mx2.fusionio.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752116Ab1DPSZ2 (ORCPT ); Sat, 16 Apr 2011 14:25:28 -0400 X-ASG-Debug-ID: 1302978324-01de284cf8157490001-xx1T2L X-Barracuda-Envelope-From: JAxboe@fusionio.com Message-ID: <4DA9DF15.80603@fusionio.com> Date: Sat, 16 Apr 2011 20:25:25 +0200 From: Jens Axboe MIME-Version: 1.0 To: "maciej.rutecki@gmail.com" CC: Shaun Ruffell , "linux-kernel@vger.kernel.org" , Tejun Heo Subject: Re: [2.6.39-rc2][bisected] Constant DISK_MEDIA_CHANGE_EVENTS from CDROM drive. References: <20110408201513.GA3040@digium.com> <201104151913.38841.maciej.rutecki@gmail.com> X-ASG-Orig-Subj: Re: [2.6.39-rc2][bisected] Constant DISK_MEDIA_CHANGE_EVENTS from CDROM drive. In-Reply-To: <201104151913.38841.maciej.rutecki@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Barracuda-Connect: mail1.int.fusionio.com[10.101.1.21] X-Barracuda-Start-Time: 1302978324 X-Barracuda-URL: http://10.101.1.181:8000/cgi-mod/mark.cgi X-Barracuda-Spam-Score: 0.00 X-Barracuda-Spam-Status: No, SCORE=0.00 using global scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=9.0 tests= X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.2.61045 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2051 Lines: 53 On 2011-04-15 19:13, Maciej Rutecki wrote: > I created a Bugzilla entry at > https://bugzilla.kernel.org/show_bug.cgi?id=33342 > for your bug report, please add your address to the CC list in there, thanks! > > On piątek, 8 kwietnia 2011 o 22:15:13 Shaun Ruffell wrote: >> Running with 2.6.39-rc2 on a CentOS 5.5 installation with a "IDE interface: >> Intel Corporation 82801CA Ultra ATA Storage Controller (rev 02)" >> (8086:248b), I've noticed constant DISK_MEDIA_CHANGE uevents. In my >> kernel log: >> >> [ 1107.530699] kobject: 'hda' (f5372610): fill_kobj_path: path = >> '/block/hda' [ 1109.580559] kobject: 'hda' (f5372610): kobject_uevent_env >> [ 1109.580594] kobject: 'hda' (f5372610): fill_kobj_path: path = >> '/block/hda' [ 1111.630560] kobject: 'hda' (f5372610): kobject_uevent_env >> [ 1111.630595] kobject: 'hda' (f5372610): fill_kobj_path: path = >> '/block/hda' [ 1113.680560] kobject: 'hda' (f5372610): kobject_uevent_env >> >> And from udevmonitor --env: >> >> UEVENT[1302291995.789487] change@/block/hda >> ACTION=change >> DEVPATH=/block/hda >> SUBSYSTEM=block >> DISK_MEDIA_CHANGE=1 >> MAJOR=3 >> MINOR=0 >> DEVNAME=hda >> DEVTYPE=disk >> SEQNUM=1318 >> >> I bisected it down to 929e27252e8ca69363f81f26af5eaba62cb4c572 'ide: >> ide_requeue_and_plug() reinstate "always plug" behaviour' >> >> I haven't yet looked into how that change would result in the change in >> behavior I'm seeing but I thought I would let you know sooner rather than >> leter in case this is something that is already known. Tejun, why would something like that trigger and endless stream of media change events? I bet this is what is cauing ide-cd to hang the system as well now. What I know: - It only triggers on UP - And then it only triggers when PREEMPT is completely turned off -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/