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SubjectRe: [Bug 9483] circular locking dependency detected

* Andrew Morton <akpm@linux-foundation.org> wrote:

> On Tue, 4 Dec 2007 22:25:18 +0100
> Ingo Molnar <mingo@elte.hu> wrote:
>
> >
> > * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> wrote:
> >
> > > =======================================================
> > > [ INFO: possible circular locking dependency detected ]
> > > 2.6.24-rc3 #6
> > > -------------------------------------------------------
> > > bash/2294 is trying to acquire lock:
> > > (&journal->j_list_lock){--..}, at: [<c01eee2f>] journal_try_to_free_buffers+0x76/0x10c
> > >
> > > but task is already holding lock:
> > > (inode_lock){--..}, at: [<c01864b6>] drop_pagecache+0x48/0xd8
> > >
> > > which lock already depends on the new lock.
> >
> > Andrew, drop_pagecache() is root-only and it has some known deadlock,
> > right?
> >
>
> yup. It takes inode_lock at too high a level so it can walk the
> per-sb inode lists.

Is there anyone genious enough to fix this? :-/

Ingo


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