linux-kernel - Re: [tracing/selftests] cfece71411: kernel-selftests.ftrace.event_trigger_-_test_inter-event_histogram_trigger_onchange

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Date:   Fri, 29 Oct 2021 09:10:53 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     kernel test robot <oliver.sang@...el.com>,
        Kalesh Singh <kaleshsingh@...gle.com>, lkp@...ts.01.org,
        lkp@...el.com, surenb@...gle.com, hridya@...gle.com,
        namhyung@...nel.org, kernel-team@...roid.com,
        Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [tracing/selftests]  cfece71411:
 kernel-selftests.ftrace.event_trigger_-_test_inter-event_histogram_trigger_onchange_action.fail

On Fri, 29 Oct 2021 21:00:56 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> > # # of passed:  85
> > # # of failed:  26
> > # # of unresolved:  1
> > # # of untested:  0
> > # # of unsupported:  0
> > # # of xfailed:  1
> > # # of undefined(test bug):  0
> > not ok 1 selftests: ftrace: ftracetest # exit=1  
> 
> Also, please configure your running environment correctly so that all
> ftracetest passes. If you unsure how to do, please ask me.

Although I think it's good to test with different configurations, where not
all tests pass. Because then there's times when a test will fail when it
should have been ignored, and that will let us know that there's a bug in
the test.

Or, different configurations might make a test fail that should have
passed, where a missing dependency was made.

I had someone report a bug that I never caught because it only happened
when something was configured off, and because I tested with everything on,
I never hit that bug.

-- Steve