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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 C4E27ECDE47 for ; Thu, 8 Nov 2018 16:05:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8FDF620857 for ; Thu, 8 Nov 2018 16:05:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=maine.edu header.i=@maine.edu header.b="PwkNx8vr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8FDF620857 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=maine.edu Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727603AbeKIBlU (ORCPT ); Thu, 8 Nov 2018 20:41:20 -0500 Received: from mail-qk1-f195.google.com ([209.85.222.195]:39225 "EHLO mail-qk1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726700AbeKIBlT (ORCPT ); Thu, 8 Nov 2018 20:41:19 -0500 Received: by mail-qk1-f195.google.com with SMTP id e4so27332551qkh.6 for ; Thu, 08 Nov 2018 08:05:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=maine.edu; s=google; h=from:date:to:cc:subject:in-reply-to:message-id:references :user-agent:mime-version; bh=IEMbJENmoZLXKePiWek5YqrFsU33ooTt7wfBA1G1VSY=; b=PwkNx8vrBlgieU8m3kuvtkzAQjQL7vkh05q4nO/teL8G+OwxQVmUS4o988lNW7Ds0M ozZGNCI4FM55CRmy2X5CbF7MrIWKcbA7+xT1AzxZQysOD2uer8Ugs8D5JaIlzoChrYXn tMXRpVvD54gI2Kl4xt9xGHfKTXBHNquWTGYm4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:to:cc:subject:in-reply-to:message-id :references:user-agent:mime-version; bh=IEMbJENmoZLXKePiWek5YqrFsU33ooTt7wfBA1G1VSY=; b=ZhbAxSM/KP6RxLt3ch8ZK9N7ZYSyHuZR7iu7zUTY4nOcdndPSXBNHX3HN2+aa/rxVB E252KtY3DO0rq3ToW1DnnML9dFo5yTU+P3yOdAFy9efJ+zkPGdNoNCjuNPzxcSPMLlAo rxHctlOf2RmHqLxjMazX3wYVadAlXng0MSZxXNzHFJ0c9nK6V930CWkDwRNMYZfxcb1r hbXmWtkLUX4CjpKPAU3L7SDLh84tZUD+3Xb7xrE0Xins8SXdLLGRGhAWUOh8jsfmY//c +kLKv9K+Z2B4Tks+FkSSeumqnzxLveirmwCxegyp27KNREay0syOK0A+i+AP5U/0ywoD Gzrg== X-Gm-Message-State: AGRZ1gJfzX1LLNqerZD3yS9IlHobC0IBd3GVQDMnO9WSlWodUs49UQUU Ycl5myibT7os5fe+H2yCi0Heuw== X-Google-Smtp-Source: AJdET5dA0sJivKAz2CJ9ieeU8+fA6MHJY304XXauK7SlFiCe29jdMbuXWp9eSPA/xkEms5Z8+Dv+Ag== X-Received: by 2002:a0c:d7d1:: with SMTP id g17mr4987933qvj.183.1541693109861; Thu, 08 Nov 2018 08:05:09 -0800 (PST) Received: from macbook-air (weaver.eece.maine.edu. [130.111.218.23]) by smtp.gmail.com with ESMTPSA id f30-v6sm3506210qtf.50.2018.11.08.08.05.08 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 08 Nov 2018 08:05:08 -0800 (PST) From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Thu, 8 Nov 2018 11:05:07 -0500 (EST) X-X-Sender: vince@macbook-air To: Vince Weaver cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Alexander Shishkin , Jiri Olsa , Namhyung Kim , torvalds@linux-foundation.org Subject: Re: perf: perf_fuzzer triggers NULL pointer dereference In-Reply-To: Message-ID: References: User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 8 Nov 2018, Vince Weaver wrote: > [91760.326510] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 > [91760.334876] PGD 0 P4D 0 > [91760.337596] Oops: 0000 [#1] SMP PTI > [91760.341332] CPU: 6 PID: 0 Comm: swapper/6 Tainted: G W 4.20.0-rc1+ #119 > [91760.349816] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS 01/26/2014 > [91760.357723] RIP: 0010:perf_prepare_sample+0x82/0x4a0 so what's the best way to do the equivelent of addr2line on something like this, now that we aren't allowed to know the RIP anymore? I probably knew at one point but I've spent the last 3 months doing 6502 assembly language Demoscene coding and so apparently I've forgotten everything I once knew about x86_64 kernel interfaces. (As can be imagined, Demoscene coding work is a lot more mentally rewarding than perf_fuzzer work). Vince