linux-kernel - Re: Kernel errors with overlay filesystem v22

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Message-ID: <28313.1401362925@warthog.procyon.org.uk>
Date:	Thu, 29 May 2014 12:28:45 +0100
From:	David Howells <dhowells@...hat.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	dhowells@...hat.com, viro@...IV.linux.org.uk,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, hch@...radead.org,
	akpm@...ux-foundation.org, apw@...onical.com, nbd@...nwrt.org,
	neilb@...e.de, jordipujolp@...il.com, ezk@....cs.sunysb.edu,
	sedat.dilek@...il.com, hooanon05@...oo.co.jp, mszeredi@...e.cz
Subject: Re: Kernel errors with overlay filesystem v22


This sequence of commands produces both errors:

 mount -t tmpfs lower_layer /lower
 mount -t tmpfs upper_layer /upper
 mkdir /upper/upper
 mkdir /upper/work
 mount -t overlayfs overlayfs /mnt -olowerdir=/lower,upperdir=/upper/upper,workdir=/upper/work
 # The lockdep error was reported in the above mount command
 umount /mnt
 umount /upper
 # The dentry leak error was reported in the last umount command

where /lower, /upper and /mnt are preexisting directories.

Note that prior to this, mounting and unmounting a tmpfs filesystem worked
with no errors.

David
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