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

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Message-ID: <28186.1401362202@warthog.procyon.org.uk>
Date:	Thu, 29 May 2014 12:16:42 +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

David Howells <dhowells@...hat.com> wrote:

> ================================================
> [ BUG: lock held when returning to user space! ]
> 3.15.0-rc6-fsdevel+ #363 Tainted: G        W    
> ------------------------------------------------
> mount/4183 is leaving the kernel with locks still held!
> 1 lock held by mount/4183:
>  #0:  (sb_writers#8){.+.+.+}, at: [<ffffffff8112bf5b>] mnt_want_write+0x1c/0x40

This comes from the:

+ mount -t overlayfs overlayfs /mnt -olowerdir=/lower,upperdir=/upper/upper,workdir=/upper/work

command.

David
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