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=-2.3 required=3.0 tests=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 A614EC32792 for ; Thu, 3 Oct 2019 10:03:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 85A172133F for ; Thu, 3 Oct 2019 10:03:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729917AbfJCKDD (ORCPT ); Thu, 3 Oct 2019 06:03:03 -0400 Received: from mx1.redhat.com ([209.132.183.28]:10494 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729896AbfJCKDD (ORCPT ); Thu, 3 Oct 2019 06:03:03 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D18D81DBC; Thu, 3 Oct 2019 10:03:02 +0000 (UTC) Received: from krava (unknown [10.43.17.55]) by smtp.corp.redhat.com (Postfix) with SMTP id BAA04608C0; Thu, 3 Oct 2019 10:03:00 +0000 (UTC) Date: Thu, 3 Oct 2019 12:03:00 +0200 From: Jiri Olsa To: Josh Hunt Cc: john@metanate.com, jolsa@kernel.org, alexander.shishkin@linux.intel.com, khlebnikov@yandex-team.ru, namhyung@kernel.org, peterz@infradead.org, acme@redhat.com, linux-kernel@vger.kernel.org Subject: Re: 4.19 dwarf unwinding broken Message-ID: <20191003100300.GA22784@krava> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.71]); Thu, 03 Oct 2019 10:03:03 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 03, 2019 at 12:54:09AM -0700, Josh Hunt wrote: > The following commit is breaking dwarf unwinding on 4.19 kernels: how? jirka > > 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