linux-kernel - Re: LOCKDEP: 3.9-rc1: mount.nfs/4272 still has locks held!

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Message-ID: <20130308140134.GA28413@gmail.com>
Date:	Fri, 8 Mar 2013 15:01:34 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Myklebust, Trond" <Trond.Myklebust@...app.com>,
	Jeff Layton <jlayton@...hat.com>, Tejun Heo <tj@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Mandeep Singh Baines <msb@...omium.org>,
	Ming Lei <ming.lei@...onical.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: LOCKDEP: 3.9-rc1: mount.nfs/4272 still has locks held!

* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

>  - the "freeezer for suspend/resume on a laptop"
> 
> [...]
> 
> The second one is unlikely to really use NFS anyway. [...]

<me raises a hand>

Incidentally I use NFS to a file server on my laptop, over wifi, and I close the lid 
for the night. It's NFS mounted soft.

If it was mounted hard I wouldn't expect the lid close event to result in a 
successful suspend if wifi went down - but with soft I would be pretty sad in the 
morning if batteries drained if I closed the lid after there's a power outage which 
took down both wifi and the laptop power supply.

Closing the lid while on battery is a pretty strong command from the user.

Arguably this is a special case on several levels as on desktop distros it's not at 
all easy mount NFS shares (all point & click automation goes to Samba shares), just 
wanted to mention it.

Thanks,

	Ingo
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