linux-kernel - Re: Linus GIT (3.3.0-rc6+) -- INFO: possible circular locking dependency detected

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Message-ID: <20120305213557.GO23916@ZenIV.linux.org.uk>
Date:	Mon, 5 Mar 2012 21:35:58 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Miles Lane <miles.lane@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Tyler Hicks <tyhicks@...onical.com>,
	Dustin Kirkland <dustin.kirkland@...zang.com>,
	ecryptfs@...r.kernel.org
Subject: Re: Linus GIT (3.3.0-rc6+) -- INFO: possible circular locking
 dependency detected

On Mon, Mar 05, 2012 at 01:23:34PM -0800, Andrew Morton wrote:
> mmap_sem nests inside i_mutex.
> 
> On the path
> 
> 	munmap
> 	->ecryptfs_vma_close
> 	  ->filemap_write_and_wait
> 	    ->generic_file_aio_write
> 
> we're taking i_mutex inside mmap_sem.  So the problem is triggered by
> ecryptfs_vma_close() calling filemap_write_and_wait() inside munmap()'s
> mmap_sem.
> 
> Question is: what did we recently change to cause this to happen?

AFAICS, it's commit 32001d6fe9ac6b0423e674a3093aa56740849f3b
Author: Tyler Hicks <tyhicks@...onical.com>
Date:   Mon Nov 21 17:31:29 2011 -0600

    eCryptfs: Flush file in vma close
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