From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnaldo Carvalho de Melo Subject: Re: perf trace: Problems initializing symbol libraries! Date: Thu, 12 May 2016 15:10:44 -0300 Message-ID: <20160512181044.GK20258@kernel.org> References: <2323271.hRPH2PSKxc@milian-kdab2> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail.kernel.org ([198.145.29.136]:36661 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751402AbcELSKv (ORCPT ); Thu, 12 May 2016 14:10:51 -0400 Content-Disposition: inline In-Reply-To: <2323271.hRPH2PSKxc@milian-kdab2> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Milian Wolff Cc: linux-perf-users@vger.kernel.org Em Thu, May 12, 2016 at 02:05:35PM +0200, Milian Wolff escreveu: > I'm getting the following error when trying to run `perf trace` built from > acme's perf/core branch on an Ubuntu 16.04 machine: > $ perf trace > Problems initializing symbol libraries! > strace shows this at the end: > ... > lstat("/proc", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0 > lstat("/proc/kallsyms", {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 > write(2, "Problems initializing symbol lib"..., 40Problems initializing symbol > libraries! > ) = 40 > exit_group(244) > Is something wrong with my /proc/kallsyms? Can someone tell me what the > problems are that are being encountered? Does it work as root? What is the value of /proc/sys/kernel/kptr_restrict? Need to improve that message :-\ - Arnaldo