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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 81B51C32792 for ; Thu, 3 Oct 2019 07:54:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4262621D71 for ; Thu, 3 Oct 2019 07:54:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=akamai.com header.i=@akamai.com header.b="gbP2QYfd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728332AbfJCHyf (ORCPT ); Thu, 3 Oct 2019 03:54:35 -0400 Received: from mx0a-00190b01.pphosted.com ([67.231.149.131]:58600 "EHLO mx0a-00190b01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726811AbfJCHyf (ORCPT ); Thu, 3 Oct 2019 03:54:35 -0400 Received: from pps.filterd (m0050095.ppops.net [127.0.0.1]) by m0050095.ppops.net-00190b01. (8.16.0.42/8.16.0.42) with SMTP id x937qTQe011541; Thu, 3 Oct 2019 08:54:12 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=akamai.com; h=to : cc : from : subject : message-id : date : mime-version : content-type : content-transfer-encoding; s=jan2016.eng; bh=1+EAAhS1Uqb8Qy/XoTHlfxsWP5AnRiqNm71M3JmRaTw=; b=gbP2QYfdVJQiIKwShqu0S2YYLSriqsQ8SIlAYNgFtQoTO6dQMo7yAuP2UNvegxSiIuPM mAqCwqHxW7WvQfSGqzAB/9gRQHU1GzWWl/roU0/ba/7zBwsQeh2zlLy8EY6BioQ+Ln5k 8UacA4ddcz6mg2NaCI87PMUZqR4Esxgx/ormWHsq/i4Ez1O8L12ObO3mRxUPxE5QXjRd NfO4vo2ldY17axDmdij6EJV3xNCjy8UoyPVXiIEvlkvrs6Ca0HUHjc8Lt61wrZeF1KIk Ndsd9WrE0W7ldQ3FTHkUhRrmhShIY+x/xzDlWwWLnaRNDV5fEmN/eQJBN0s/rLEDGy9m Zg== Received: from prod-mail-ppoint5 (prod-mail-ppoint5.akamai.com [184.51.33.60] (may be forged)) by m0050095.ppops.net-00190b01. with ESMTP id 2v9y24jm89-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 03 Oct 2019 08:54:12 +0100 Received: from pps.filterd (prod-mail-ppoint5.akamai.com [127.0.0.1]) by prod-mail-ppoint5.akamai.com (8.16.0.27/8.16.0.27) with SMTP id x937l23S020229; Thu, 3 Oct 2019 00:54:11 -0700 Received: from prod-mail-relay11.akamai.com ([172.27.118.250]) by prod-mail-ppoint5.akamai.com with ESMTP id 2va5g982k5-1; Thu, 03 Oct 2019 00:54:10 -0700 Received: from [0.0.0.0] (caldecot.sanmateo.corp.akamai.com [172.22.187.166]) by prod-mail-relay11.akamai.com (Postfix) with ESMTP id AF8C31FC6B; Thu, 3 Oct 2019 07:54:09 +0000 (GMT) To: john@metanate.com, jolsa@kernel.org, alexander.shishkin@linux.intel.com, khlebnikov@yandex-team.ru, namhyung@kernel.org, peterz@infradead.org, acme@redhat.com Cc: linux-kernel@vger.kernel.org From: Josh Hunt Subject: 4.19 dwarf unwinding broken Message-ID: Date: Thu, 3 Oct 2019 00:54:09 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-10-03_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=8 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=823 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910030076 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,1.0.8 definitions=2019-10-03_03:2019-10-01,2019-10-03 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 suspectscore=18 bulkscore=0 mlxscore=0 priorityscore=1501 spamscore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 mlxlogscore=866 phishscore=0 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1908290000 definitions=main-1910030077 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit is breaking dwarf unwinding on 4.19 kernels: commit e5adfc3e7e774ba86f7bb725c6eef5f32df8630e Author: Konstantin Khlebnikov Date: Tue Aug 7 12:09:01 2018 +0300 perf map: Synthesize maps only for thread group leader It looks like this was fixed later by: commit e8ba2906f6b9054102ad035ac9cafad9d4168589 Author: John Keeping Date: Thu Aug 15 11:01:45 2019 +0100 perf unwind: Fix libunwind when tid != pid but was not selected as a backport to 4.19. Are there plans to backport the fix? If not, could we have the breaking commit reverted in 4.19 LTS? Thanks Josh