From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757842AbaEPQV1 (ORCPT ); Fri, 16 May 2014 12:21:27 -0400 Received: from casper.infradead.org ([85.118.1.10]:40585 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757818AbaEPQVZ (ORCPT ); Fri, 16 May 2014 12:21:25 -0400 Date: Fri, 16 May 2014 18:21:17 +0200 From: Peter Zijlstra To: "H. Peter Anvin" Cc: Sasha Levin , Ingo Molnar , acme@ghostprotocols.net, LKML , Thomas Gleixner , Dave Jones , tytso@mit.edu, price@mit.edu, hannes@stressinduktion.org Subject: Re: BUG_ON drivers/char/random.c:986 (Was: perf: use after free in perf_remove_from_context) Message-ID: <20140516162117.GY11096@twins.programming.kicks-ass.net> References: <5370EBE9.6@oracle.com> <20140516153455.GV11096@twins.programming.kicks-ass.net> <53763775.3040602@linux.intel.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="tJKub4+frm2HVP3B" Content-Disposition: inline In-Reply-To: <53763775.3040602@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 --tJKub4+frm2HVP3B Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, May 16, 2014 at 09:06:13AM -0700, H. Peter Anvin wrote: > On 05/16/2014 08:34 AM, Peter Zijlstra wrote: > >=20 > > While fuzzing to reproduce my issue I hit the below, its triggered loads > > of times and then the machine wedged (needed a power cycle), I can > > provide the full console log if people care. > >=20 > > Anybody seen that one before? > >=20 >=20 > I certainly haven't... this bad. Any idea what the actual system call > looked like? Sadly, no, while I had syscall tracing enabled, the bug I'm chasing is non fatal so I hadn't set it to dump on bug -- not that dumping 24*1.4M trace buffers over serial would've completed this side of the century. I did save the trinity output (including seeds) but my experience so far is that that is no guarantee for reproduction. --tJKub4+frm2HVP3B Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJTdjr9AAoJEHZH4aRLwOS6f0IQAKSJnghojPDCMnQWRD8fDGmk 7wuR0XOjb9jxChPJ+i2THlFeULfWcmY9E9bGsey3w6nH+7+ygjlkJ7xcfaN7o76I KZCrQFDEnJP6SIxJtpFvoN8qjUlNM03Aal0bM1p2hINyszhn6MdMEnu8Ig3Zbczs MQnLWOZmX40o3PZw7FWOypzpGtHa3fOpr2trFJPykzrw8lbhMnen4zbkDki+fTJ+ diIR9tbkn2uJNztprwVWLUEs1KfpcQlPYfmGjeAi9u1HmMngoqV8hVE9Qp9rZgps y8lFAJfzJYmqq4A56A1w42xZYfeHEBBuUuVprFl/HiKczszPDWQtkEREQXbrpzMM IATX53qBhwM50/s3NeQJLglqHJF7tbxSBK7TkS5o0Kg7ZdEbt8RVF1k+U1NUNENE TxeSsPRkpwcvAWYIvUnnwQIHeY1lwyTbCfqDMzzTLIgBxH9YIT6L12V6lWp18iJ3 /tOkz0A0LL/0NrqPFxd59pr5Y2UpCQUlNZa0qwVQzp5P4lFsY5wURqNjFc6kxycA vZXTZblmDgS3hMh4OI+UJ2mkrw2wL4Q8BlNA9B/tp+d7iwFtz3EQRSyVN2o3P5cV m8TE8EEeVWONxoQIoR1iyjiUnvxTehSsQcADI+dV/6hsZWMbTcQYaoh7Ksf6vLhx c9sFoDP8l1oyL7Ep1ONr =BSBI -----END PGP SIGNATURE----- --tJKub4+frm2HVP3B--