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From: Andrew Morton <akpm@osdl.org>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: "alpha @ steudten Engineering" <alpha@steudten.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: INFO: possible circular locking dependency detected
Date: Wed, 18 Oct 2006 23:02:43 -0700	[thread overview]
Message-ID: <20061018230243.6b40e8e8.akpm@osdl.org> (raw)
In-Reply-To: <4533980C.10403@yahoo.com.au>

On Tue, 17 Oct 2006 00:32:44 +1000
Nick Piggin <nickpiggin@yahoo.com.au> wrote:

> alpha @ steudten Engineering wrote:
> > =======================================================
> > [ INFO: possible circular locking dependency detected ]
> > 2.6.18-1.2189self #1
> > -------------------------------------------------------
> > kswapd0/186 is trying to acquire lock:
> >  (&inode->i_mutex){--..}, at: [<c0326e32>] mutex_lock+0x21/0x24
> > 
> > but task is already holding lock:
> >  (iprune_mutex){--..}, at: [<c0326e32>] mutex_lock+0x21/0x24
> > 
> > which lock already depends on the new lock.
> 
> Thanks. __grab_cache_page wants to clear __GFP_FS, because it is
> holding the i_mutex so we don't want to reenter the filesystem in
> page reclaim.

We want to be able to enter page reclaim while holding i_mutex.  Think what
the effect of not doing this would be upon write() (!)

This warning is more fallout from ntfs's insistence on taking i_mutex in
its clear_inode().  See lengthy and unproductive discussion at
http://lkml.org/lkml/2006/7/26/185 .


  parent reply	other threads:[~2006-10-19  6:03 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-10-16 14:05 alpha @ steudten Engineering
2006-10-16 14:32 ` Nick Piggin
2006-10-16 15:42   ` Randy Dunlap
2006-10-16 15:46     ` Nick Piggin
2006-10-19  6:02   ` Andrew Morton [this message]
2006-10-19  6:30     ` Nick Piggin
2007-02-08 15:03 Pedro M. López
2009-10-10 23:09 John Kacur
2009-12-06 10:11 Richard Zidlicky
2011-07-14 14:49 Sergey Senozhatsky
2011-07-14 16:41 ` Peter Zijlstra
2011-07-14 16:57   ` Paul E. McKenney
2011-07-14 19:16     ` Sergey Senozhatsky
2011-07-14 19:15   ` Sergey Senozhatsky
2011-07-14 19:34     ` Paul E. McKenney
2011-07-14 19:38       ` Dave Jones
2011-07-14 20:33         ` Paul E. McKenney
2011-07-14 19:38       ` Sergey Senozhatsky
2011-07-14 16:58 ` Steven Rostedt
2011-07-14 17:02   ` Steven Rostedt
2011-07-14 17:05     ` Paul E. McKenney
2011-07-14 17:32       ` Steven Rostedt
2011-07-14 17:46         ` Steven Rostedt
2011-07-14 19:18           ` Paul E. McKenney
2011-07-14 19:41             ` Steven Rostedt
2011-07-14 20:33               ` Paul E. McKenney
2011-07-15 11:05             ` Ed Tomlinson
2011-07-15 11:29               ` Peter Zijlstra
2011-07-15 11:35                 ` Ed Tomlinson
2011-07-15 11:39                 ` Peter Zijlstra
2011-07-15 18:11                   ` Paul E. McKenney
2011-07-15 12:42                 ` Paul E. McKenney
2011-07-15 13:07                   ` Peter Zijlstra
2011-07-15 14:36                     ` Paul E. McKenney
2011-07-15 15:04                       ` Peter Zijlstra
2011-07-15 15:59                         ` Paul E. McKenney
2011-07-15 16:11                           ` Peter Zijlstra
2011-07-15 16:56                             ` Paul E. McKenney
2011-07-15 21:48                               ` Ed Tomlinson
2011-07-15 22:04                                 ` Paul E. McKenney
2011-07-16 19:42                                   ` Ed Tomlinson
2011-07-17  0:02                                     ` Paul E. McKenney
2011-07-17  1:56                                       ` Ed Tomlinson
2011-07-17 14:28                                         ` Paul E. McKenney
2011-07-18 15:15                                           ` Paul E. McKenney
2011-07-18  9:29                                     ` Peter Zijlstra
2011-07-18 15:29                                       ` Paul E. McKenney
2011-07-15 16:55                     ` Steven Rostedt
2011-07-15 17:03                       ` Paul E. McKenney
2011-07-15 17:16                         ` Steven Rostedt
2011-07-15 17:24                           ` Paul E. McKenney
2011-07-15 17:42                             ` Steven Rostedt
2011-07-15 18:33                               ` Paul E. McKenney
2011-08-07 16:22 Justin P. Mattock
2011-08-11 20:57 ` Justin P. Mattock

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