linux-kernel - Re: Lockdep usage

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Date:	Fri, 23 Apr 2010 02:34:47 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Darren Hart <dvhltc@...ibm.com>
Cc:	Yong Zhang <yong.zhang@...driver.com>,
	"lkml, " <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Lockdep usage

On Thu, 22 Apr 2010, Darren Hart wrote:

> dmesg includes the following during bootup, but nothing new while running the
> tests:
> 
> BUG: key ffff88024e657858 not in .data!
> ------------[ cut here ]------------
> WARNING: at kernel/lockdep.c:2706 lockdep_init_map+0x226/0x5c0()
> Hardware name: BladeCenter LS21 -[7971AC1]-
> Pid: 1, comm: swapper Not tainted 2.6.34-rc1dvhv4ls #32
> Call Trace:
>  [<ffffffff81078446>] ? lockdep_init_map+0x226/0x5c0
>  [<ffffffff81048687>] warn_slowpath_common+0x87/0xb0
>  [<ffffffff810486c4>] warn_slowpath_null+0x14/0x20
>  [<ffffffff81078446>] lockdep_init_map+0x226/0x5c0
>  [<ffffffff81077f53>] ? lock_release_holdtime+0x83/0xf0
>  [<ffffffff8115e5a1>] sysfs_add_file_mode+0x71/0xd0
>  [<ffffffff8115e611>] sysfs_add_file+0x11/0x20
>  [<ffffffff8115e650>] sysfs_create_file+0x30/0x40
>  [<ffffffff814995d9>] device_create_file+0x19/0x20
>  [<ffffffff813afe55>] ipmi_register_smi+0xba5/0xfc0
>  [<ffffffff81498877>] ? put_device+0x17/0x20
>  [<ffffffff810670d0>] ? autoremove_wake_function+0x0/0x40
>  [<ffffffff813b3a12>] try_smi_init+0x5d2/0xa20
>  [<ffffffff818d5b72>] init_ipmi_si+0x432/0xb80
>  [<ffffffff818d5740>] ? init_ipmi_si+0x0/0xb80
>  [<ffffffff810001dd>] do_one_initcall+0x3d/0x180
>  [<ffffffff822d5a6c>] kernel_init+0x16c/0x200
>  [<ffffffff81003c14>] kernel_thread_helper+0x4/0x10
>  [<ffffffff822d5900>] ? kernel_init+0x0/0x200
>  [<ffffffff81003c10>] ? kernel_thread_helper+0x0/0x10
> ---[ end trace 30838b0dc5ec48e4 ]---
> 
> Several more "BUG: key fffXXXXXXXXXXXX not in .data!" lines show up throughout
> the boot process.

This should be fixed by commit c7df670b (contained first in 2.6.34-rc2). 
Do you still see this even with this patch applied?

-- 
Jiri Kosina
SUSE Labs, Novell Inc.

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