From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756044AbaENQ3y (ORCPT ); Wed, 14 May 2014 12:29:54 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:51645 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754703AbaENQ3w (ORCPT ); Wed, 14 May 2014 12:29:52 -0400 Date: Wed, 14 May 2014 18:29:43 +0200 From: Peter Zijlstra To: Sasha Levin Cc: Ingo Molnar , acme@ghostprotocols.net, LKML , Thomas Gleixner , Dave Jones Subject: Re: perf: use after free in perf_remove_from_context Message-ID: <20140514162943.GR30445@twins.programming.kicks-ass.net> References: <5370EBE9.6@oracle.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="U50CbOr64UnCgK/4" Content-Disposition: inline In-Reply-To: <5370EBE9.6@oracle.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 --U50CbOr64UnCgK/4 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, May 12, 2014 at 11:42:33AM -0400, Sasha Levin wrote: > Hi all, >=20 > While fuzzing with trinity inside a KVM tools guest running the latest -n= ext > kernel I've stumbled on the following spew. Maybe related to the very rec= ent > change in freeing on task exit? >=20 > [ 2509.827261] general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGE= ALLOC > [ 2509.830379] Dumping ftrace buffer: > [ 2509.830379] (ftrace buffer empty) > [ 2509.830379] Modules linked in: > [ 2509.830379] CPU: 47 PID: 43306 Comm: trinity-c126 Tainted: G W = 3.15.0-rc5-next-20140512-sasha-00019-ga20bc00-dirty #456 Any particular trinity setup? And would you happen to have the seed of that run? --U50CbOr64UnCgK/4 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJTc5n3AAoJEHZH4aRLwOS6ERsP/RVGMA/gmN90F7/HQgf2jBrm uVqWKGrPePqrfb8Pu+RMAemylajvBi9J0CTWPBOEi0HECtFIcs6wurGsXD0VXCrc 5OXqVlxMmvawqFN9khPOfzU/lacIDtf9735Cxubx9iNmxGkThlORvQ0s9U0GXG5z 6Su8hOMvrJHjfrDBoVYEmDJIkKSf1J4kvOG4pQG0bL/tP9WJvXanrvldlWtp+Drm evwBerfUjIirqlKPGnUFbJLBOZlho9l1Ab4srR+4Vj49IZ2Sza3TTuIZx6vrwzhP UyfKLdIueamKtH2fhIy1CZVBQF2vBLAixFRufT96ZJgT6EsqgmNuGoUNvFHoh/Af FWDTD1bLODy9pL0HnXw64A4a1JfzLuBk55iKQEBcMVspy5+xg9hX9VbuOhbglNxC RrqUYSJ+I+lqGN9lyyWhCWFzsZ5YWPWM23qKGn3/h9fUcaFN1GGgLoq8VRCEo0uI FCX5sTUFeMt6d38ilTr96h996lPJBGs4qP5TQ3vLWVgf+Hix+DEkeXli+qbib9yp 7+q0J9ywIUeXsEMPwCYkOIYuagClKOz9N01VgfSrssL4Xbl4yXS832S+r81AA0Xy BO3jthQbrfjkbzK85SvByt12X3pTj0taG584IB8rMfy4wZ2yswXyENx5Y2uhZT2j u/6KS+CxW3KLcjOw6BT/ =HDn0 -----END PGP SIGNATURE----- --U50CbOr64UnCgK/4--