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    SubjectRe: [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
    *** Remember to use Documentation/SubmitChecklist when testing your code ***


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