From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DDEE1C433DF for ; Tue, 16 Jun 2020 14:57:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C22EF20644 for ; Tue, 16 Jun 2020 14:57:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729800AbgFPO5V convert rfc822-to-8bit (ORCPT ); Tue, 16 Jun 2020 10:57:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38730 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729005AbgFPO5U (ORCPT ); Tue, 16 Jun 2020 10:57:20 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4867CC061573 for ; Tue, 16 Jun 2020 07:57:20 -0700 (PDT) Received: from p5de0bf0b.dip0.t-ipconnect.de ([93.224.191.11] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jlD1Q-0007u0-7x; Tue, 16 Jun 2020 16:57:08 +0200 Received: by nanos.tec.linutronix.de (Postfix, from userid 1000) id 76D76100F18; Tue, 16 Jun 2020 16:57:07 +0200 (CEST) From: Thomas Gleixner To: Andy Lutomirski Cc: kernel test robot , Alexandre Chartre , Peter Zijlstra , Andy Lutomirski , LKML , lkp@lists.01.org, ltp@lists.linux.it Subject: Re: [x86/entry] 2bbc68f837: ltp.ptrace08.fail In-Reply-To: <8E41B15F-D567-4C52-94E9-367015480345@amacapital.net> References: <87y2onbdtb.fsf@nanos.tec.linutronix.de> <8E41B15F-D567-4C52-94E9-367015480345@amacapital.net> Date: Tue, 16 Jun 2020 16:57:07 +0200 Message-ID: <87ftav2h4s.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Andy Lutomirski writes: >> On Jun 16, 2020, at 1:44 AM, Thomas Gleixner wrote: >> >> kernel test robot writes: >>> FYI, we noticed the following commit (built with gcc-9): >>> >>> commit: 2bbc68f8373c0631ebf137f376fbea00e8086be7 ("x86/entry: Convert Debug exception to IDTENTRY_DB") >>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master >> >> Is the head of linux.git exposing the same problem or is this an >> intermittent failure, which only affects bisectability? > > It sure looks deterministic: > > ptrace08.c:62: BROK: Cannot find address of kernel symbol "do_debug" Hahahaha. But not only LTP, also LKP-tests makes assumptions: monitors/irq_exception_noise:[ "$exception" -eq "1" ] && export ftrace_filters='__do_page_fault do_divide_error do_overflow do_bounds do_invalid_op do_device_not_available do_double_fault do_coprocessor_segment_overrun do_invalid_TSS do_segment_not_present do_spurious_interrupt_bug do_coprocessor_error do_alignment_check do_simd_coprocessor_error do_debug do_stack_segment do_general_protection' stable-api-nonsense.rst comes to my mind. Thanks, tglx