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    SubjectRe: [2.6.22] circular lock detected
    > On Mon, 3 Sep 2007 14:27:02 +0200 Jan Kara <jack@suse.cz> wrote:
    > > > On Fri, 24 Aug 2007 23:00:33 +0200 Folkert van Heusden <folkert@vanheusden.com> wrote:
    > > > Hi,
    > > >
    > > > 2.6.22 kernel with hyperthreading enabled only ext3 filesystems (2).
    > > >
    > > > [ 346.314640] =======================================================
    > > > [ 346.314758] [ INFO: possible circular locking dependency detected ]
    > > > [ 346.314815] 2.6.22 #5
    > > > [ 346.314862] -------------------------------------------------------
    > > > [ 346.314920] tor/2421 is trying to acquire lock:
    > > > [ 346.314973] (tty_mutex){--..}, at: [<c121aa83>] mutex_lock+0x8/0xa
    > > > [ 346.315193]
    > > > [ 346.315195] but task is already holding lock:
    > > > [ 346.316203] (&s->s_dquot.dqptr_sem){----}, at: [<c10a485f>] dquot_alloc_space+0x50/0x189
    > > > [ 346.316457]
    > > > [ 346.316458] which lock already depends on the new lock.
    >
    > ...
    >
    > > > [ 346.353603] =======================
    > > >
    > > Has been reported before, but I don't recall whether we fixed it. Jan,
    > > do you know>?
    > I think we at least found a solution: Teach lockdep that I_MUTEX for
    > different filesystems is different. Peter Zilstra wrote a patch for that
    > and Folkert even confirmed that it fixes the problem for him. I'm not
    > sure what happened with the patch afterwards though. Adding Peter to CC
    > :).

    But this is a tty_lock-versus-dqptr_sem ranking error. Unrelated to i_mutex?
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