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=-5.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 14EBBC433E0 for ; Tue, 16 Jun 2020 13:27:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E0DCE2098B for ; Tue, 16 Jun 2020 13:27:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Vgcn+56G" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728893AbgFPN1k (ORCPT ); Tue, 16 Jun 2020 09:27:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52930 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726452AbgFPN1k (ORCPT ); Tue, 16 Jun 2020 09:27:40 -0400 Received: from merlin.infradead.org (unknown [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED310C061573 for ; Tue, 16 Jun 2020 06:27:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=5RIE+8EpdHjIjWRy7eCN7J3sN/8pSSmTZHYw0/cpfDU=; b=Vgcn+56GvP50cYcunuXQVdBiO7 fnfxnwyIMROvsDSfTDI4ErZJQ9+vskcr3z3Yk+2eGwbt3Okc5V23CPLcgp15hFAfeL0JljOJcY/UH WgWXzpbw+B/Vra96qzLvN6dBNy8C0ag7AcWU8ydnebZu8XKAd05XSrt9FXDqXTuGWC8SJAI3kJvIr QP6NYtKBXO8odqOD8p2gwZsyHqqxhd+LlltYsLMJbVD/sK8/RkOOZX+V3RECoPFYvGHvj4yZK35t0 PAR6XWmUF+WAS4jSk/hQoxCj49XfrJRZujXhSfM8ymHRi115Tr7vNRuQPhIFW1al43R1TvGQH0BIx UxcZzATA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jlBcK-0002s1-JP; Tue, 16 Jun 2020 13:27:08 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id EBE3130018A; Tue, 16 Jun 2020 15:27:05 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id D8AA1203D48A4; Tue, 16 Jun 2020 15:27:05 +0200 (CEST) Date: Tue, 16 Jun 2020 15:27:05 +0200 From: Peter Zijlstra To: Andy Lutomirski Cc: Thomas Gleixner , kernel test robot , Alexandre Chartre , Andy Lutomirski , LKML , lkp@lists.01.org, ltp@lists.linux.it Subject: Re: [x86/entry] 2bbc68f837: ltp.ptrace08.fail Message-ID: <20200616132705.GW2531@hirez.programming.kicks-ass.net> References: <87y2onbdtb.fsf@nanos.tec.linutronix.de> <8E41B15F-D567-4C52-94E9-367015480345@amacapital.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <8E41B15F-D567-4C52-94E9-367015480345@amacapital.net> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 16, 2020 at 06:22:10AM -0700, Andy Lutomirski wrote: > > > 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" ROFL