From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756559AbcLQNw0 (ORCPT ); Sat, 17 Dec 2016 08:52:26 -0500 Received: from merlin.infradead.org ([205.233.59.134]:49420 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751544AbcLQNwZ (ORCPT ); Sat, 17 Dec 2016 08:52:25 -0500 Date: Sat, 17 Dec 2016 14:52:14 +0100 From: Peter Zijlstra To: Darren Hart Cc: tglx@linutronix.de, mingo@kernel.org, juri.lelli@arm.com, rostedt@goodmis.org, xlpang@redhat.com, bigeasy@linutronix.de, linux-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, jdesfossez@efficios.com, bristot@redhat.com Subject: Re: [PATCH -v4 00/10] FUTEX_UNLOCK_PI wobbles Message-ID: <20161217135214.GY3107@twins.programming.kicks-ass.net> References: <20161213083638.938898295@infradead.org> <20161216233140.GC62123@f23x64.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161216233140.GC62123@f23x64.localdomain> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 16, 2016 at 03:31:40PM -0800, Darren Hart wrote: > On Tue, Dec 13, 2016 at 09:36:38AM +0100, Peter Zijlstra wrote: > > That way, when we drop hb->lock to wait, futex and rt_mutex wait state is > > consistent. > > > > > > In any case, it passes our inadequate testing. > > It passed my CI tools/testing/selftests/futex/functional/run.sh. Did you also > happen to run a fuzz tester? I did not. I'm not sure how good trinity is at poking holes in futexes. I would love a domain specific fuzzer for futex, but I suspect it would end up being me writing it :-(