From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760802Ab3LIOQd (ORCPT ); Mon, 9 Dec 2013 09:16:33 -0500 Received: from mx1.redhat.com ([209.132.183.28]:65513 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755788Ab3LIOQc (ORCPT ); Mon, 9 Dec 2013 09:16:32 -0500 Date: Mon, 9 Dec 2013 15:16:24 +0100 From: Jiri Olsa To: David Ahern Cc: acme@ghostprotocols.net, linux-kernel@vger.kernel.org Subject: Re: [PATCH] perf tool: Ensure forward progress unwinding frames Message-ID: <20131209141624.GC30360@krava.brq.redhat.com> References: <1385942509-11445-1-git-send-email-dsahern@gmail.com> <52A4B065.9080804@gmail.com> <20131209100205.GA1242@krava.brq.redhat.com> <52A5CE1B.3030007@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <52A5CE1B.3030007@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Dec 09, 2013 at 07:05:15AM -0700, David Ahern wrote: > On 12/9/13, 3:02 AM, Jiri Olsa wrote: > >>On 12/1/13, 5:01 PM, David Ahern wrote: > >>>The dwarf option for callstacks is getting stuck on the unwind and showing > >>>repeated frames. For example, > >>> > >>>qemu-system-x86 13759 [001] 287663.084957: syscalls:sys_enter_futex: uaddr: 0x7f770a958700, op: 0x00000081, val: 0x00000001, utime: 0x7f75ea > >>> 7f7705fd23ea __lll_unlock_wake (/lib64/libpthread-2.14.90.so) > >>> 7f7705fcf045 _L_unlock_649 (/lib64/libpthread-2.14.90.so) > >>> 7f7705fcf045 _L_unlock_649 (/lib64/libpthread-2.14.90.so) > >>> 7f7705fcf045 _L_unlock_649 (/lib64/libpthread-2.14.90.so) > >>> 7f7705fcf045 _L_unlock_649 (/lib64/libpthread-2.14.90.so) > >>> 7f7705fcf045 _L_unlock_649 (/lib64/libpthread-2.14.90.so) > >>> ... > > > >I wonder this is us or libunwind bug (or cfi code) ;-) > > > >looks like you can reproduce..? are you using the latest libunwind? > > $ rpm -q libunwind > libunwind-0.99-2.20110424git1e10c293.fc16.x86_64 [jolsa@krava libunwind]$ rpm -q libunwind libunwind-1.1-2.fc19.x86_64 ;-)