Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755031AbbLGIvo (ORCPT ); Mon, 7 Dec 2015 03:51:44 -0500 Received: from szxga01-in.huawei.com ([58.251.152.64]:18348 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753643AbbLGIvm (ORCPT ); Mon, 7 Dec 2015 03:51:42 -0500 From: Wang Nan To: , , , CC: , , , Wang Nan Subject: [PATCH] perf tools: Clear struct machine during machine__init() Date: Mon, 7 Dec 2015 08:51:24 +0000 Message-ID: <1449478284-44295-1-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020203.5665489A.012F,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: fedf31dc3fc33e446e4fb7f56e6c3880 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1688 Lines: 54 There are so many test cases use stack allocated 'struct machine'. Including: test__hists_link test__hists_filter test__mmap_thread_lookup test__thread_mg_share test__hists_output test__hists_cumulate Also, in non-test code (for example, machine__new_host()) there are code use 'malloc()' to alloc struct machine. These are dangerous operations, cause some tests fail or hung in machines__exit(). For example, in machines__exit -> machine__destroy_kernel_maps -> map_groups__remove -> maps__remove -> pthread_rwlock_wrlock a incorrectly initialized lock causes unintended behavior. This patch bzero() that structure in machine__init() to ensure all fields in 'struct machine' are initialized to zero. Signed-off-by: Wang Nan Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Namhyung Kim --- tools/perf/util/machine.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index bfc289c..188cfdf 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -25,6 +25,7 @@ static void dsos__init(struct dsos *dsos) int machine__init(struct machine *machine, const char *root_dir, pid_t pid) { + bzero(machine, sizeof(*machine)); map_groups__init(&machine->kmaps, machine); RB_CLEAR_NODE(&machine->rb_node); dsos__init(&machine->dsos); -- 1.8.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/