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    SubjectRe: [2.6.20] BUG: workqueue leaked lock
    On 15-03-2007 20:17, Folkert van Heusden wrote:
    >>> On Tue, 13 Mar 2007 17:50:14 +0100 Folkert van Heusden <folkert@vanheusden.com> wrote:
    >>> ...
    >>> [ 1756.728209] BUG: workqueue leaked lock or atomic: nfsd4/0x00000000/3577
    > ...
    >>> [ 1846.684023] [<c1003bdb>] kernel_thread_helper+0x7/0x10
    >> Oleg, that's a fairly incomprehensible message we have in there. Can you
    >> please explain what it means?
    >
    > Haha ok :-)
    >
    > Good, since I run 2.6.20 with these debugging switches switched on, I
    > get occasionally errors like these. I get ALWAYS the following error
    > when the system first boots when the TOR executable is started:
    >
    > [ 137.324255] =======================================================
    > [ 137.324359] [ INFO: possible circular locking dependency detected ]
    > [ 137.324412] 2.6.20 #2
    > [ 137.324457] -------------------------------------------------------

    Hi,

    IMHO you should now switch off lockdep ("Lock debuging: ..." options),
    until you update or get some patch for this circular problem. Your
    logs should be sufficient to nfsd people and lockdep turns off checking
    after this anyway. I don't know if this is a known and real locking
    problem, but it could be interesting now, if workqueue error would
    reapear. It seems nfsd code is breaking somewhere with locks held -
    maybe because of problems with lockdep's error handling.

    Regards,
    Jarek P.

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