Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-gg0-f169.google.com ([209.85.161.169]:56121 "EHLO mail-gg0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752794Ab3CFSpc (ORCPT ); Wed, 6 Mar 2013 13:45:32 -0500 Date: Wed, 6 Mar 2013 10:45:26 -0800 From: Tejun Heo To: Jeff Layton Cc: Oleg Nesterov , "Myklebust, Trond" , Mandeep Singh Baines , Ming Lei , "J. Bruce Fields" , Linux Kernel Mailing List , "linux-nfs@vger.kernel.org" , "Rafael J. Wysocki" , Andrew Morton , Ingo Molnar , Al Viro Subject: Re: LOCKDEP: 3.9-rc1: mount.nfs/4272 still has locks held! Message-ID: <20130306184526.GL1227@htj.dyndns.org> References: <20130304205307.GA13527@redhat.com> <4FA345DA4F4AE44899BD2B03EEEC2FA9286AEEB0@sacexcmbx05-prd.hq.netapp.com> <20130305082308.6607d4db@tlielax.poochiereds.net> <20130305174648.GF12795@htj.dyndns.org> <20130305174954.GG12795@htj.dyndns.org> <20130305140312.243cb094@tlielax.poochiereds.net> <20130305190923.GI12795@htj.dyndns.org> <20130305183941.19ff39ce@tlielax.poochiereds.net> <20130306181735.GB18687@redhat.com> <20130306134004.16252a21@tlielax.poochiereds.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20130306134004.16252a21@tlielax.poochiereds.net> Sender: linux-nfs-owner@vger.kernel.org List-ID: 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