From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755939AbaJNVGf (ORCPT ); Tue, 14 Oct 2014 17:06:35 -0400 Received: from mail.kernel.org ([198.145.19.201]:45038 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755911AbaJNVGb (ORCPT ); Tue, 14 Oct 2014 17:06:31 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Arnaldo Carvalho de Melo , Adrian Hunter , Don Zickus , Douglas Hatch , Ingo Molnar , Jiri Olsa , Namhyung Kim , Paul Mackerras , Peter Zijlstra , Scott J Norton , Waiman Long Subject: [PATCH 20/24] perf machine: Add missing dsos->root rbtree root initialization Date: Tue, 14 Oct 2014 18:04:29 -0300 Message-Id: <1413320673-5784-21-git-send-email-acme@kernel.org> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1413320673-5784-1-git-send-email-acme@kernel.org> References: <1413320673-5784-1-git-send-email-acme@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnaldo Carvalho de Melo A segfault happens on 'perf test hists_link' because we end up using a struct machines on the stack, and then machines__init() was not initializing the newly introduced rb_root, just the existing list_head. When we introduced struct dsos, to group the two ways to store dsos, i.e. the linked list and the rbtree, we didn't turned the initialization done in: machines__init(machines->host) -> machine__init() -> INIT_LIST_HEAD into a dsos__init() to keep on initializing the list_head but _as well_ initializing the rb_root, oops. All worked because outside perf-test we probably zalloc the whole thing which ends up initializing it in to NULL. So the problem looks contained to 'perf test' that uses it on stack, etc. Reported-by: Jiri Olsa Acked-by: Waiman Long , Cc: Adrian Hunter , Cc: Don Zickus Cc: Douglas Hatch Cc: Ingo Molnar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Scott J Norton Cc: Waiman Long , Link: http://lkml.kernel.org/r/20141014180353.GF3198@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/machine.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index b7d477fbda02..34fc7c8672e4 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -13,12 +13,18 @@ #include #include "unwind.h" +static void dsos__init(struct dsos *dsos) +{ + INIT_LIST_HEAD(&dsos->head); + dsos->root = RB_ROOT; +} + int machine__init(struct machine *machine, const char *root_dir, pid_t pid) { map_groups__init(&machine->kmaps); RB_CLEAR_NODE(&machine->rb_node); - INIT_LIST_HEAD(&machine->user_dsos.head); - INIT_LIST_HEAD(&machine->kernel_dsos.head); + dsos__init(&machine->user_dsos); + dsos__init(&machine->kernel_dsos); machine->threads = RB_ROOT; INIT_LIST_HEAD(&machine->dead_threads); -- 1.9.3