From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753896AbdCHQbo (ORCPT ); Wed, 8 Mar 2017 11:31:44 -0500 Received: from mail.kernel.org ([198.145.29.136]:56460 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753840AbdCHQbm (ORCPT ); Wed, 8 Mar 2017 11:31:42 -0500 Date: Wed, 8 Mar 2017 11:21:44 -0500 From: Steven Rostedt To: Sebastian Andrzej Siewior Cc: Peter Zijlstra , tglx@linutronix.de, mingo@kernel.org, juri.lelli@arm.com, xlpang@redhat.com, linux-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, jdesfossez@efficios.com, bristot@redhat.com, dvhart@infradead.org Subject: Re: [PATCH] futex: move debug_rt_mutex_free_waiter() further down Message-ID: <20170308112144.63dc36de@gandalf.local.home> In-Reply-To: <20170308153731.z3vjtb24h75eyv4u@linutronix.de> References: <20170304092717.762954142@infradead.org> <20170304093559.546712677@infradead.org> <20170308152901.kumylhi7l3hescxd@linutronix.de> <20170308153731.z3vjtb24h75eyv4u@linutronix.de> X-Mailer: Claws Mail 3.14.0 (GTK+ 2.24.31; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 8 Mar 2017 16:37:32 +0100 Sebastian Andrzej Siewior wrote: > On 2017-03-08 16:29:02 [+0100], To Peter Zijlstra wrote: > > Without this, futex_requeue_pi_signal_restart will trigger > > > > |kernel BUG at locking/rtmutex_common.h:55! > > |Call Trace: > > | rt_mutex_cleanup_proxy_lock+0x54/0x90 > > | futex_wait_requeue_pi.constprop.21+0x387/0x4d0 > > | do_futex+0x289/0xbf0 > > |RIP: remove_waiter+0x157/0x170 RSP: ffffc90000e0fbe0 > > > > with BUG 2222222222222222 != pointer once this patch is applied. > > My wording is wrong. This BUG_ON() statement described here in this > patch (together with the test case mentioned) will trigger once > > "[PATCH -v5 12/14] futex,rt_mutex: Restructure rt_mutex_finish_proxy_lock()" > > is applied. > Now I read this. Ignore my last email. -- Steve