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Message-ID: <20100313051305.GA19498@parisc-linux.org> Date: Fri, 12 Mar 2010 22:13:05 -0700 From: Matthew Wilcox <matthew@....cx> To: "Eric W. Biederman" <ebiederm@...ssion.com> Cc: James Bottomley <James.Bottomley@...senPartnership.com>, Yinghai Lu <yinghai@...nel.org>, Alexander Beregalov <a.beregalov@...il.com>, Greg KH <gregkh@...e.de>, linux-acpi@...r.kernel.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-scsi <linux-scsi@...r.kernel.org> Subject: Re: 2.6.34-rc1: ACPI: BUG: key f71f0168 not in .data! On Fri, Mar 12, 2010 at 08:58:36PM -0800, Eric W. Biederman wrote: > The root problem is that we occasionally have unrecognized deadlocks > on the sysfs attributes. > > For 2.6.33 I managed to get lockdep mostly working but there the way > I did it generated a lot of false positives. > > For 2.6.34 I reworked the sysfs lockdep handling to remove the false > positives by treating each sysfs attribute as it's own class. Most > sysfs attributes are declared statically and don't need any > initialization. Unfortunately there are a handful of dynamically > allocated sysfs attributes that do need initialization. > > This patch is a fix to get one of those last handful of dynamically > allocated sysfs attributes that I missed and apparently do not > exist in my test system. There's a few more than this showing up on my laptop. Looking in dmesg, the first gets a backtrace: [ 1.034471] BUG: key f6a26638 not in .data! [ 1.034600] ------------[ cut here ]------------ [ 1.034736] WARNING: at kernel/lockdep.c:2706 lockdep_init_map+0xd1/0x40c() [ 1.034867] Hardware name: LifeBook P8010 [ 1.034993] Modules linked in: [ 1.035170] Pid: 1, comm: swapper Not tainted 2.6.34-rc1-00005-g522dba7 #80 [ 1.035300] Call Trace: [ 1.035428] [<c102caba>] warn_slowpath_common+0x60/0x90 [ 1.035561] [<c102caf7>] warn_slowpath_null+0xd/0x10 [ 1.035694] [<c104fa6a>] lockdep_init_map+0xd1/0x40c [ 1.035827] [<c10de32a>] ? sysfs_new_dirent+0x73/0xdb [ 1.035959] [<c10ddc56>] sysfs_add_file_mode+0x4c/0x88 [ 1.036132] [<c10ddca0>] sysfs_add_file+0xe/0x13 [ 1.036264] [<c10ddd32>] sysfs_create_file+0x20/0x22 [ 1.036394] [<c11ee279>] device_create_file+0x13/0x15 [ 1.036528] [<c129246e>] thermal_zone_device_register+0x3d0/0x5db [ 1.036662] [<c11b160f>] acpi_thermal_add+0x1f6/0x42d Subsequent ones don't: [ 1.039072] BUG: key f6a26668 not in .data! [ 1.039220] BUG: key f6a2f488 not in .data! [ 1.039358] BUG: key f6a2f408 not in .data! [ 1.039571] thermal LNXTHERM:01: registered as thermal_zone0 [ 1.039719] ACPI: Thermal Zone [TZ00] (27 C) [ 1.040515] BUG: key f6a18e38 not in .data! [ 1.040648] BUG: key f6a18e68 not in .data! [ 1.040800] BUG: key f6a9ef88 not in .data! [ 1.040941] BUG: key f6a9ef08 not in .data! [ 1.041185] thermal LNXTHERM:02: registered as thermal_zone1 [ 25.196957] iwlagn 0000:14:00.0: firmware: requesting iwlwifi-4965-2.ucode [ 25.197163] BUG: key f663393c not in .data! [ 25.217340] iwlagn 0000:14:00.0: loaded firmware version 228.57.2.21 -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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