linux-kernel - Re: 2.6.31-rc2 -- INFO: inconsistent lock state -- inconsistent {IN-RECLAIM_FS-W} -> {RECLAIM

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Date:	Wed, 08 Jul 2009 10:24:27 -0400
From:	Eric Paris <eparis@...hat.com>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Miles Lane <miles.lane@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg KH <greg@...ah.com>,
	Matthew Dharm <mdharm-usb@...-eyed-alien.net>,
	David Brownell <dbrownell@...rs.sourceforge.net>
Subject: Re: 2.6.31-rc2 -- INFO: inconsistent lock state -- inconsistent 
 {IN-RECLAIM_FS-W} -> {RECLAIM_FS-ON-W} usage.

On Tue, 2009-07-07 at 20:51 -0700, Roland Dreier wrote:
> [ adding Eric Paris cc as this looks to be an inotify issue ]
> 
>  > [ 6627.976224] =================================
>  > [ 6627.976237] [ INFO: inconsistent lock state ]
>  > [ 6627.976247] 2.6.31-rc2 #16
>  > [ 6627.976254] ---------------------------------
>  > [ 6627.976263] inconsistent {IN-RECLAIM_FS-W} -> {RECLAIM_FS-ON-W} usage.
>  > [ 6627.976276] khubd/217 [HC0[0]:SC0[0]:HE1:SE1] takes:
>  > [ 6627.976285]  (iprune_mutex){+.+.?.}, at: [<c10ba899>]
>  > invalidate_inodes+0x20/0xe3
>  > [ 6627.976315] {IN-RECLAIM_FS-W} state was registered at:
>  > [ 6627.976324]   [<c10536ab>] __lock_acquire+0x2c9/0xac4
>  > [ 6627.976343]   [<c1053f45>] lock_acquire+0x9f/0xc2
>  > [ 6627.976358]   [<c1308872>] __mutex_lock_common+0x2d/0x323
>  > [ 6627.976376]   [<c1308c00>] mutex_lock_nested+0x2e/0x36
>  > [ 6627.976392]   [<c10ba6ff>] shrink_icache_memory+0x38/0x1b2
>  > [ 6627.976407]   [<c108bfb6>] shrink_slab+0xe2/0x13c
>  > [ 6627.976424]   [<c108c3e1>] kswapd+0x3d1/0x55d
>  > [ 6627.976439]   [<c10449b5>] kthread+0x66/0x6b
>  > [ 6627.976454]   [<c1003fdf>] kernel_thread_helper+0x7/0x10
>  > [ 6627.976472]   [<ffffffff>] 0xffffffff

It could be a real bug.  Reminds me a lot of
http://lkml.org/lkml/2009/4/29/782 but not the same thing since I've
removed all allocation under *notify locks.  I'll try to put something
together this afternoon....

-Eric

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