From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751674AbaIJIby (ORCPT ); Wed, 10 Sep 2014 04:31:54 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:51795 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750879AbaIJIbw (ORCPT ); Wed, 10 Sep 2014 04:31:52 -0400 Date: Wed, 10 Sep 2014 10:31:36 +0200 From: Peter Zijlstra To: Vince Weaver Cc: linux-kernel@vger.kernel.org, Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo , Steven Rostedt Subject: Re: perf: perf_fuzzer triggers instant reboot Message-ID: <20140910083136.GP6758@twins.programming.kicks-ass.net> References: <20140908185115.GI6758@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="7SdHTC2uUYj4Zouy" Content-Disposition: inline In-Reply-To: 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 --7SdHTC2uUYj4Zouy Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Sep 09, 2014 at 01:53:50PM -0400, Vince Weaver wrote: >=20 > OK so trying to use ftrace to track this issue, and this happens (on=20 > core2, 3.17-rc4) >=20 > [ 295.992012] PANIC: double fault, error_code: 0x0 > [ 295.992012] CPU: 1 PID: 2916 Comm: trace-cmd Not tainted 3.17.0-rc4+ #= 82 > [ 295.992012] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.20= 12, BIOS 080015 10/19/2012 > [ 295.992012] task: ffff8800cb20a800 ti: ffff8800ca30c000 task.ti: ffff8= 800ca30c000 > [ 295.992012] RIP: 0010:[] [] perf_= trace_x86_exceptions+0x2d/0xb7 > [ 295.992012] RSP: 0018:ffff8800bfffff58 EFLAGS: 00010082 > [ 295.992012] RAX: 0000000000000001 RBX: ffff880037c9f490 RCX: 000000000= 0000000 > [ 295.992012] RDX: ffff8800c0000098 RSI: ffffe8ffffc81010 RDI: ffffffff8= 1a26600 > [ 295.992012] RBP: ffff8800c0000058 R08: 0000000000044ea5 R09: ffffe8fff= fc81010 > [ 295.992012] R10: 0000000000000000 R11: ffff8800ca30fc48 R12: ffff8800c= 0000098 > [ 295.992012] R13: ffffe8ffffc81010 R14: 0000000000000000 R15: ffffffff8= 1a26600 > [ 295.992012] FS: 00007f4217f82700(0000) GS:ffff88011fc80000(0000) knlG= S:0000000000000000 > [ 295.992012] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 295.992012] CR2: ffff8800bfffff48 CR3: 00000000ca0b9000 CR4: 000000000= 00407e0 > [ 295.992012] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000= 0000000 > [ 295.992012] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 000000000= 0000600 > [ 295.992012] Stack: > [ 295.992012] PANIC: double fault, error_code: 0x0 >=20 Sasha reported something from his KVM based fuzzing, maybe that's the same. But that x86_exceptions thing is interesting, lemme go look at that first. --7SdHTC2uUYj4Zouy Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJUEAxoAAoJEHZH4aRLwOS63igP/1VqB1pl/M7YEIOoI5dZUrkf t7sLKrr4a5vDlEDe5pUxYJw4ZpHSC3lgECA4ca15ac+bc4bp2wWiJc5m0ROG9tF+ 2yTe01I3VEfXw+hsExJGZhYOu2F7d59N4AjDVP9duYZ7+YzU6vZg2nBDQ1oEAAU9 1xQcj9dRk7BVLhos3S6jTxHwriP8lgvMDlAtFXcC0Zh6xKIIoIvMUkyvqI44GG9v AzoSoeOf8GFjGXRxdTONL0jbj4LJ4/xYpisVE6tr/K7EVaHS8Q4JJEkzKkRn1ezH 9nE+hHiklz+keldmfDaQ4jMmDxYPUyKzf3eiLRHd7apx+IDlFgjMmDWKPsG60WDW VUj82FFRvMgk94zoFNRU/3TEocWU+Cn/AilIxM9tA+tT0VtduyPFl6OChDujDQaO s1xcZwcO0dmPIAJ69sybFGVuUG/94odANx/C9keln8OV/XPY7CVHfEn8a+j8mp0W 6ZDkwtWfpCCYStU3RVMoa4sW9r9aU0BxKc8IEU4zW91tFo5MuQioZzPEhv/qwDSt GLGq0p33YeEKhkQAWJRWAY3+HON4zes0RsCyazM2ucHIBHRnLVM0mcnCakYxVpEW wMVevp9V/Zvg6OZ5cD0qnxAN2nOUEwM9ZHaMn0LllcQLylur3rnuICJx+NNuS2ho Fks0Td0/6CMbROmjdtQL =zu8p -----END PGP SIGNATURE----- --7SdHTC2uUYj4Zouy--