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    SubjectRe: 2.6.18-git21, possible recursive locking in kseriod ends up in DWARF2 unwinder stuck
    On 10/4/06, Jiri Kosina <jikos@jikos.cz> wrote:
    > On Wed, 4 Oct 2006, Alessandro Suardi wrote:
    >
    > > Non-fatal (box is still alive and apparently well) on boot,
    > > FC5-uptodate on a Dell Latitude C640. From the dmesg ring:
    >
    > > [ 8.680000] =============================================
    > > [ 8.680000] [ INFO: possible recursive locking detected ]
    > > [ 8.680000] 2.6.18-git21 #1
    > > [ 8.680000] ---------------------------------------------
    > > [ 8.680000] kseriod/163 is trying to acquire lock:
    > > [ 8.680000] (&ps2dev->cmd_mutex/1){--..}, at: [<c03198c3>]
    > > ps2_command+0x89/0x358
    >
    > Me and Peter Zijlstra have already submitted patches to fix this - read
    > the thread at
    > http://linux.derkeiler.com/Mailing-Lists/Kernel/2006-09/msg07416.html
    >
    > I don't know the reason why these have not yet been merged into the input
    > tree. Dmitry?
    >

    Sorry, was a little busy.

    I tested the patches and they work. Couple of comments:

    - register_lock_class is marked as inline but now has 2 call sites and
    is relatively big - might want to remove "inline"
    - how about adding lockdep_set_subclass() to avoid littering source
    with struct lock_class_key when we only want to tweak subclass? For
    that we might want export register_lock_class and hide it behind a
    #define...

    --
    Dmitry
    -
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