From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752067AbbEGRGr (ORCPT ); Thu, 7 May 2015 13:06:47 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:42832 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751380AbbEGRGo (ORCPT ); Thu, 7 May 2015 13:06:44 -0400 Date: Thu, 7 May 2015 19:06:26 +0200 From: Peter Zijlstra To: Tvrtko Ursulin Cc: Tejun Heo , linux-kernel@vger.kernel.org, Ingo Molnar , Greg Kroah-Hartman , NeilBrown Subject: Re: pmu_dev_alloc; warning at at kernel/locking/lockdep.c:3002 lockdep_init_map Message-ID: <20150507170626.GA27504@twins.programming.kicks-ass.net> References: <554B6E78.2090608@linux.intel.com> <20150507140557.GV21418@twins.programming.kicks-ass.net> <20150507162523.GB12245@htj.duckdns.org> <554B9305.301@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <554B9305.301@linux.intel.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 07, 2015 at 05:29:57PM +0100, Tvrtko Ursulin wrote: > >>> May 7 11:58:20 skl kernel: [ 6.066696] futex hash table entries: 1024 (order: 5, 131072 bytes) > >>> May 7 11:58:20 skl kernel: [ 6.329549] HugeTLB registered 2 MB page size, pre-allocated 0 pages > > sysfs by default uses lockdep key embedded in attrs. It looks like > > somebody is making on-heap copies of attrs and using them as the group > > attrs. What's the offending pmu type? > > I am not familiar with this area, is this the answer? Nope, that's way before you get the fail. initcall_debug might get you the right answer, but I suspect its the intel_uncore driver. I see arch/x86/kernel/cpu/perf_event_intel_uncore.c:uncore_type_init() do exactly what TJ says, its dynamically allocating struct attribute. Now, let me try and trigger that locally, that should not be skylake specific at all.