linux-kernel - Re: [PATCH] tracing: Add task_prctl

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Message-ID: <CANpmjNP+CFijZ-nhwSR_sdxNDTjfRfyQ5c5wLE=fqN=nhL8FEA@mail.gmail.com>
Date: Wed, 6 Nov 2024 10:22:15 +0100
From: Marco Elver <elver@...gle.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Kees Cook <keescook@...omium.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>, 
	kasan-dev@...glegroups.com
Subject: Re: [PATCH] tracing: Add task_prctl_unknown tracepoint

On Tue, 5 Nov 2024 at 18:22, Marco Elver <elver@...gle.com> wrote:
...
> > > > I'm also surprised that the comm didn't show in the trace_pipe.
> > >
> > > Any config options or tweaks needed to get it to show more reliably?
> > >
> > > > I've
> > > > updated the code so that it should usually find it. But saving it here may
> > > > not be a big deal.
> >
> > How did you start it? Because it appears reliable for me.
>
> Very normally from bash. Maybe my env is broken in other ways, I'll
> dig a little.

Some trial and error led me to conclude it's a race between the logic
looking up the comm and the process exiting: If the test program exits
soon after the traced event, it doesn't print the comm. Adding a
generous usleep() before it exits reliably prints the comm.