From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF94AEE14C3 for ; Wed, 6 Sep 2023 21:36:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235360AbjIFVg7 (ORCPT ); Wed, 6 Sep 2023 17:36:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49036 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231613AbjIFVg7 (ORCPT ); Wed, 6 Sep 2023 17:36:59 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6EB8BE7C; Wed, 6 Sep 2023 14:36:55 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F3B28C433C7; Wed, 6 Sep 2023 21:36:53 +0000 (UTC) Date: Wed, 6 Sep 2023 17:37:06 -0400 From: Steven Rostedt To: Naresh Kamboju Cc: zhengyejian1@huawei.com, akaher@vmware.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-trace-kernel@vger.kernel.org, mhiramat@kernel.org, shuah@kernel.org, skhan@linuxfoundation.org, yeweihua4@huawei.com Subject: Re: "[PATCH] selftests/ftrace: Correctly enable event in instance-event.tc" Message-ID: <20230906173706.7aeb8716@gandalf.local.home> In-Reply-To: <20230906103718.0405ccb4@gandalf.local.home> References: <20230906142652.191866-1-naresh.kamboju@linaro.org> <20230906103718.0405ccb4@gandalf.local.home> X-Mailer: Claws Mail 3.19.1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org On Wed, 6 Sep 2023 10:37:18 -0400 Steven Rostedt wrote: > > Log details, > > ------------- > > # ok 45 ftrace - test tracing error log support > > <47>[ 1373.662292] systemd-journald[90]: Sent WATCHDOG=1 notification. > > # ok 46 Test creation and deletion of trace instances while setting an event > > It's definitely a race with the creation and deletion of instances. > > I'm going to run it on my laptop VM and see if that reproduces it. My other > VM is on a pretty powerful machine, and perhaps that's keeping it from > hitting the race. Putting in a while loop of: # while :; do ./ftracetest test.d/instances/instance-event.tc ; done eventually triggered the bug. Looks like this is really an existing bug not related to the eventfs, but the eventfs code actually opened up the window of this race. Hopefully I'll have a fix shortly. -- Steve