linux-kernel - Re: [bug 2.6.37-git] lockdep: invalid subclass in mousedev

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Date:	Mon, 25 Oct 2010 16:46:55 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [bug 2.6.37-git] lockdep: invalid subclass in mousedev_create()

On Tue, 26 Oct 2010 10:40:26 +1100 Dave Chinner wrote:

> Folks,
> 
> Just got this booting a VM on a 2.6.37-git tree from a couple of days ago:
> 
> [    1.547497] BUG: looking up invalid subclass: 31
> [    1.548238] turning off the locking correctness validator.
> [    1.548923] Pid: 1, comm: swapper Not tainted 2.6.36-dgc+ #580
> [    1.549637] Call Trace:
> [    1.550024]  [<ffffffff810b88b0>] register_lock_class+0x540/0x550
> [    1.550880]  [<ffffffff810baded>] ? trace_hardirqs_on+0xd/0x10
> [    1.552001]  [<ffffffff810b8925>] ? lockdep_init_map+0x65/0x150
> [    1.553564]  [<ffffffff810b8990>] lockdep_init_map+0xd0/0x150
> [    1.554980]  [<ffffffff8197c7a7>] mousedev_create+0x247/0x2e0
> [    1.556461]  [<ffffffff821af4ee>] ? mousedev_init+0x0/0x61
> [    1.557857]  [<ffffffff821af50a>] mousedev_init+0x1c/0x61
> [    1.559343]  [<ffffffff810001e3>] do_one_initcall+0x43/0x190
> [    1.560724]  [<ffffffff8217a75d>] kernel_init+0x15d/0x1e7
> [    1.562117]  [<ffffffff81037e64>] kernel_thread_helper+0x4/0x10
> [    1.563693]  [<ffffffff81afe690>] ? restore_args+0x0/0x30
> [    1.565150]  [<ffffffff8217a600>] ? kernel_init+0x0/0x1e7
> [    1.566647]  [<ffffffff81037e60>] ? kernel_thread_helper+0x0/0x10
> 
> Looks like it does:
> 
> #define MOUSEDEV_MIX 31
> ....
> 	lockdep_set_subclass(&mousedev->mutex,
>                              minor == MOUSEDEV_MIX ? MOUSEDEV_MIX : 0);

Hi Dave,
Please see this reply:
http://lkml.org/lkml/2010/10/25/48

---
~Randy
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