From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965187AbXDBJSq (ORCPT ); Mon, 2 Apr 2007 05:18:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933942AbXDBJSq (ORCPT ); Mon, 2 Apr 2007 05:18:46 -0400 Received: from mtagate2.de.ibm.com ([195.212.29.151]:24634 "EHLO mtagate2.de.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933281AbXDBJSo (ORCPT ); Mon, 2 Apr 2007 05:18:44 -0400 Date: Mon, 2 Apr 2007 11:20:48 +0200 From: Cornelia Huck To: Tejun Heo Cc: James Bottomley , gregkh@suse.de, hugh@veritas.com, dmitry.torokhov@gmail.com, oneukum@suse.de, maneesh@in.ibm.com, rpurdie@rpsys.net, Jeff Garzik , lkml , "linux-ide@vger.kernel.org" , SCSI Mailing List Subject: Re: [RFD driver-core] Lifetime problems of the current driver model Message-ID: <20070402112048.047867c1@gondolin.boeblingen.de.ibm.com> In-Reply-To: <20070401195943.GA29627@htj.dyndns.org> References: <460CDBA6.5030608@gmail.com> <1175257751.3760.19.camel@mulgrave.il.steeleye.com> <460D12B8.6050101@gmail.com> <1175278774.3760.44.camel@mulgrave.il.steeleye.com> <20070401195943.GA29627@htj.dyndns.org> Organization: IBM Deutschland Entwicklung GmbH X-Mailer: Claws Mail 2.8.0 (GTK+ 2.8.20; i486-pc-linux-gnu) X-Legal: IBM Deutschland Entwicklung GmbH Vorsitzender des Aufsichtsrats: Johann Weihen =?ISO-8859-15?Q?Gesch=E4ftsf=FChrung:?= Herbert Kircher Sitz der Gesellschaft: =?ISO-8859-15?Q?B=F6blingen?= Registergericht: Amtsgericht Stuttgart, HRB 243294 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2 Apr 2007 04:59:43 +0900, Tejun Heo wrote: > Okay, here's preliminary patch. I've tested it very lightly so it's > likely to contain bugs and definitely needs to be splitted. Cool. However, there's something fishy there (not sure whether it's in your patch or a latent bug in the ccw bus code that just has been uncovered): ------------[ cut here ]------------ kernel BUG at mm/slab.c:607! illegal operation: 0001 [#1] CPU: 1 Not tainted Process kslowcrw (pid: 36, task: 0000000001a80cc0, ksp: 0000000001a87ce0) Krnl PSW : 0404000180000000 00000000000b21b0 (kfree+0x144/0x154) R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:0 CC:0 PM:0 EA:3 Krnl GPRS: 0000000000000000 0000000000000000 00000000009836d8 000003fffd22ffe0 00000000000b20aa 0000000000396ba8 0000000001a6d100 0000000000986c88 0700000001a879d8 0000000000555428 000000000344a5b0 0000000001a879c8 000000000344a500 0000000000390ca8 00000000000b20aa 0000000001a879c8 Krnl Code: 00000000000b21a2: e392c0480024 stg %r9,72(%r2,%r12) 00000000000b21a8: a7f4ffc9 brc 15,1000b213a 00000000000b21ac: a7f40001 brc 15,b21ae >00000000000b21b0: a7f4ff9d brc 15,1000b20ea 00000000000b21b4: e33030100004 lg %r3,16(%r3) 00000000000b21ba: a7f4ff90 brc 15,1000b20da 00000000000b21be: 0707 bcr 0,%r7 00000000000b21c0: eb8ff0580024 stmg %r8,%r15,88(%r15) Call Trace: ([<00000000000b20aa>] kfree+0x3e/0x154) [<00000000001166f2>] release_sysfs_dirent+0x3e/0xf4 [<0000000000114914>] sysfs_hash_and_remove+0x150/0x154 [<0000000000118aec>] remove_files+0x48/0x68 [<0000000000118b84>] sysfs_remove_group+0x78/0xe8 [<00000000001cce3c>] device_remove_groups+0x48/0x68 [<00000000001cd4c0>] device_remove_attrs+0x3c/0x7c [<00000000001cd70e>] device_del+0x20e/0x3a8 [<00000000001cd8d2>] device_unregister+0x2a/0x44 [<000000000022fb2c>] css_sch_device_unregister+0x3c/0x54 [<0000000000230124>] css_evaluate_subchannel+0x2f0/0x400 [<000000000023041a>] css_trigger_slow_path+0xda/0x154 [<0000000000054c9a>] run_workqueue+0x136/0x1fc [<0000000000054e3a>] worker_thread+0xda/0x170 [<000000000005b05a>] kthread+0x122/0x15c [<0000000000019912>] kernel_thread_starter+0x6/0xc [<000000000001990c>] kernel_thread_starter+0x0/0xc This happens when I detach a device (which causes it to be unregistered). I'll look at it when I'm fully operational.