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

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Date:	Wed, 6 Mar 2013 10:45:26 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	"Myklebust, Trond" <Trond.Myklebust@...app.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!

Hello,

On Wed, Mar 06, 2013 at 01:40:04PM -0500, Jeff Layton wrote:
> Though when I said that, it was before Tejun mentioned hooking this up
> to ptrace. I'll confess that I don't fully understand what he's
> proposing either though...

Oh, they're all just pretty closely related.  All signal and ptrace
traps run off get_signal_to_deliver().  It is still a bit hairy but in
much better shape after cleanups which accompanied PTRACE_SEIZE and I
don't really think it'll be too difficult to extend it so that
freezing is implemented as a type of jobctl trap.

Thanks.

-- 
tejun
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