From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 50203 invoked by alias); 14 Jan 2016 08:31:31 -0000 Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org Received: (qmail 50180 invoked by uid 89); 14 Jan 2016 08:31:30 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-3.2 required=5.0 tests=AWL,BAYES_00,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=unwinding X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Thu, 14 Jan 2016 08:31:29 +0000 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id 682AEC0A5173; Thu, 14 Jan 2016 08:31:28 +0000 (UTC) Received: from blokker.wildebeest.org (ovpn-116-47.ams2.redhat.com [10.36.116.47]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u0E8VQaF026013 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Thu, 14 Jan 2016 03:31:28 -0500 Received: by blokker.wildebeest.org (Postfix, from userid 1000) id 55BBF20DBA; Thu, 14 Jan 2016 09:31:26 +0100 (CET) Date: Thu, 14 Jan 2016 08:31:00 -0000 From: Mark Wielaard To: Jinhua Luo Cc: "Frank Ch. Eigler" , systemtap@sourceware.org Subject: Re: [HELP] ubacktrace() problem Message-ID: <20160114083126.GB2958@blokker.redhat.com> References: <20160113152312.GC7497@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-SW-Source: 2016-q1/txt/msg00027.txt.bz2 On Thu, Jan 14, 2016 at 11:40:19AM +0800, Jinhua Luo wrote: > Maybe the glibc and its debuginfo on Debian8 is bad? Unfortunately it is indeed. In theory you won't need debuginfo just for backtraces if debian could enable -fasynchronous-unwind-tables: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=746426 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=746516 The other issue is that depending on version debian uses .zdebug or SHF_COMPRESSED debug sections in their debug packages. This is partially supported by systemtap (through elfutils) for some debuginfo, but not for .debug_frame if that is required for unwinding. This has also been an issue for other tools like valgrind: https://bugs.kde.org/show_bug.cgi?id=303877 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=810295 Cheers, Mark