linux-kernel - Re: [PATCH] tracing/selftests: Run the ownership test twice

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Message-ID: <20240614124151.33ee0dc6@rorschach.local.home>
Date: Fri, 14 Jun 2024 12:41:51 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>, Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Ali Zahraee <ahzahraee@...il.com>, Shuah
 Khan <shuah@...nel.org>, Shuah Khan <skhan@...uxfoundation.org>,
 linux-kselftest@...r.kernel.org, Linus Torvalds
 <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] tracing/selftests: Run the ownership test twice


Shuah,

Can you take this through your tree?

-- Steve


On Thu, 23 May 2024 12:45:41 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
> 
> A regression happened where running the ownership test passes on the first
> iteration but fails running it a second time. This was caught and fixed,
> but a later change brought it back. The regression was missed because the
> automated tests only run the tests once per boot.
> 
> Change the ownership test to iterate through the tests twice, as this will
> catch the regression with a single run.
> 
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> ---
>  .../ftrace/test.d/00basic/test_ownership.tc   | 34 +++++++++++--------
>  1 file changed, 20 insertions(+), 14 deletions(-)
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/00basic/test_ownership.tc b/tools/testing/selftests/ftrace/test.d/00basic/test_ownership.tc
> index c45094d1e1d2..71e43a92352a 100644
> --- a/tools/testing/selftests/ftrace/test.d/00basic/test_ownership.tc
> +++ b/tools/testing/selftests/ftrace/test.d/00basic/test_ownership.tc
> @@ -83,32 +83,38 @@ run_tests() {
>  	done
>  }
>  
> -mount -o remount,"$new_options" .
> +# Run the tests twice as leftovers can cause issues
> +for loop in 1 2 ; do
>  
> -run_tests
> +	echo "Running iteration $loop"
>  
> -mount -o remount,"$mount_options" .
> +	mount -o remount,"$new_options" .
>  
> -for d in "." "events" "events/sched" "events/sched/sched_switch" "events/sched/sched_switch/enable" $canary; do
> -	test "$d" $original_group
> -done
> +	run_tests
> +
> +	mount -o remount,"$mount_options" .
> +
> +	for d in "." "events" "events/sched" "events/sched/sched_switch" "events/sched/sched_switch/enable" $canary; do
> +		test "$d" $original_group
> +	done
>  
>  # check instances as well
>  
> -chgrp $other_group instances
> +	chgrp $other_group instances
>  
> -instance="$(mktemp -u test-XXXXXX)"
> +	instance="$(mktemp -u test-XXXXXX)"
>  
> -mkdir instances/$instance
> +	mkdir instances/$instance
>  
> -cd instances/$instance
> +	cd instances/$instance
>  
> -run_tests
> +	run_tests
>  
> -cd ../..
> +	cd ../..
>  
> -rmdir instances/$instance
> +	rmdir instances/$instance
>  
> -chgrp $original_group instances
> +	chgrp $original_group instances
> +done
>  
>  exit 0