From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755658Ab0BTN6S (ORCPT ); Sat, 20 Feb 2010 08:58:18 -0500 Received: from he.sipsolutions.net ([78.46.109.217]:49369 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755395Ab0BTN6O (ORCPT ); Sat, 20 Feb 2010 08:58:14 -0500 Subject: Re: sysfs lockdep complaint From: Johannes Berg To: =?ISO-8859-1?Q?Am=E9rico?= Wang Cc: Kernel development list , "Eric W. Biederman" In-Reply-To: <20100220135122.GB3000@hack> References: <1266485543.6539.4.camel@jlt3.sipsolutions.net> <2375c9f91002200126x22b262b3r8b9b58e3cee34077@mail.gmail.com> <1266664814.11514.5.camel@jlt3.sipsolutions.net> <20100220135122.GB3000@hack> Content-Type: text/plain; charset="UTF-8" Date: Sat, 20 Feb 2010 14:58:11 +0100 Message-ID: <1266674291.18465.7.camel@jlt3.sipsolutions.net> Mime-Version: 1.0 X-Mailer: Evolution 2.29.3.2 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2010-02-20 at 21:51 +0800, Américo Wang wrote: > >BUG: key c0000002165eb478 not in .data! > > > >instead of the lockdep complaint above. > > > > I am not surprised. :) > > Please send us the backtraces you got, we could expect this. I hacked in dump_stack() but it overflowed my log buffer, here's an example: [ 31.625411] BUG: key c0000002134f2ab0 not in .data! [ 31.625414] Call Trace: [ 31.625417] [c000000213b677c0] [c000000000012c1c] .show_stack+0xc0/0x200 (unreliable) [ 31.625423] [c000000213b67890] [c0000000005ac968] .dump_stack+0x28/0x3c [ 31.625428] [c000000213b67910] [c0000000000b6a3c] .lockdep_init_map+0x11c/0x674 [ 31.625433] [c000000213b67a10] [c0000000001efd90] .sysfs_add_file_mode+0x90/0x124 [ 31.625438] [c000000213b67ad0] [c0000000001efe60] .sysfs_add_file+0x3c/0x50 [ 31.625442] [c000000213b67b70] [c0000000001f2f40] .sysfs_create_bin_file+0x5c/0x78 [ 31.625448] [c000000213b67c10] [c0000000000cd0b0] .load_module+0x16a4/0x197c [ 31.625452] [c000000213b67d80] [c0000000000cd424] .SyS_init_module+0x9c/0x2d4 [ 31.625457] [c000000213b67e30] [c0000000000075d4] syscall_exit+0x0/0x40 There's also [ 34.776604] BUG: key c000000216265388 not in .data! [ 34.776606] Call Trace: [ 34.776609] [c000000213b5f7a0] [c000000000012c1c] .show_stack+0xc0/0x200 (unreliable) [ 34.776615] [c000000213b5f870] [c0000000005ac968] .dump_stack+0x28/0x3c [ 34.776620] [c000000213b5f8f0] [c0000000000b6a3c] .lockdep_init_map+0x11c/0x674 [ 34.776624] [c000000213b5f9f0] [c0000000001efd90] .sysfs_add_file_mode+0x90/0x124 [ 34.776629] [c000000213b5fab0] [c0000000001f32b4] .internal_create_group+0x168/0x24c [ 34.776634] [c000000213b5fb70] [c0000000001f3420] .sysfs_create_group+0x38/0x50 [ 34.776639] [c000000213b5fc10] [c0000000000ccf20] .load_module+0x1514/0x197c [ 34.776644] [c000000213b5fd80] [c0000000000cd424] .SyS_init_module+0x9c/0x2d4 [ 34.776649] [c000000213b5fe30] [c0000000000075d4] syscall_exit+0x0/0x40 and many many times... Let me recompile with that dump_stack() removed. johannes