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 49EE8ECDE4B for ; Thu, 8 Nov 2018 16:46:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 112EB2077B for ; Thu, 8 Nov 2018 16:46:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=maine.edu header.i=@maine.edu header.b="hQIyFQAd" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 112EB2077B 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 S1727005AbeKICXH (ORCPT ); Thu, 8 Nov 2018 21:23:07 -0500 Received: from mail-qk1-f196.google.com ([209.85.222.196]:42245 "EHLO mail-qk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726585AbeKICXG (ORCPT ); Thu, 8 Nov 2018 21:23:06 -0500 Received: by mail-qk1-f196.google.com with SMTP id m5so3897671qka.9 for ; Thu, 08 Nov 2018 08:46:47 -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=6zTe9U4eVMVGlN13E3lWnRN7lUZ4APDipeHnvMeFxRo=; b=hQIyFQAdubwQXoXNLkX5N7iB/b3rGjkNzbFNHFHymv7+rICW53UzuNAcM8dYbtls9L z6W9okpDb3Vq2plb0JyjTOPu3EBeJejQ9I0MIsf/KnRhlMQnMCeOvCaSpnx6GP/UQCK4 0jUAqtv8PfPy27oI/bbFhSnnEIWbzL6p7uSCU= 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=6zTe9U4eVMVGlN13E3lWnRN7lUZ4APDipeHnvMeFxRo=; b=M5gRLcadg6hiDYt6V+GmLIGVUfL6R7gKVFwADAjGoeTnHWunU/8XWY2kt1K9Y+6rmg 9A08MGia0l/CZC+WyGJlnF1l9UFXRq11uMADSOquHClXrtryprjIyESK0W3E/iN53XPA r11SEOYCmLVwiuUmtBoTQklwVzVH4/hPYMsoJhytpykPPpM3E9wIW1wTH7CXRgXnwl9s Grn7FjKEyyJi+uYodv/y7QA/iVvpMPDfmR5ZUytljFlTt/G9sHi6CJ5wP8eYH8gwmoWW TIoGwonjVybnViyE8tvcbeEXA9IumuWTVAeE3mDt/EnE3sFGjj7xG/Fsjgu8+tfYCA6F Gv8g== X-Gm-Message-State: AGRZ1gI4WtR86YQVSOq9BPIolNLQ6+VdWhewqLe4SszqqDn2+gIddFgD UQ/gJNZeRScUjqTLvLNjFpcywA== X-Google-Smtp-Source: AJdET5eWBpL0o4Pl3mSlvlz8gYcmH64NbqS3CKQ6kv4YTPwIFzKKKaGKstk5MXCO7Nt9Y+/rkHf3Ag== X-Received: by 2002:ac8:2fdc:: with SMTP id m28mr5341848qta.202.1541695606558; Thu, 08 Nov 2018 08:46:46 -0800 (PST) Received: from macbook-air (weaver.eece.maine.edu. [130.111.218.23]) by smtp.gmail.com with ESMTPSA id 33sm3977679qto.14.2018.11.08.08.46.44 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 08 Nov 2018 08:46:45 -0800 (PST) From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Thu, 8 Nov 2018 11:46:41 -0500 (EST) X-X-Sender: vince@macbook-air To: Alexander Shishkin cc: Vince Weaver , linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Jiri Olsa , Namhyung Kim , torvalds@linux-foundation.org Subject: Re: perf: perf_fuzzer triggers NULL pointer dereference In-Reply-To: <87a7mj5yx4.fsf@ashishki-desk.ger.corp.intel.com> Message-ID: References: <87a7mj5yx4.fsf@ashishki-desk.ger.corp.intel.com> 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, Alexander Shishkin wrote: > Vince Weaver writes: > > > 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? > > scripts/decode_stacktrace.sh works most of the time. > > Sounds like BTS needs fixing up again. Thanks for looking at it though! In case it matters, it looks like the address of the oops comes down to linux.git/kernel/events/core.c:6393 size += data->callchain->nr; Vince