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

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Message-ID: <20241106101823.4a5d556d@gandalf.local.home>
Date: Wed, 6 Nov 2024 10:18:23 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Marco Elver <elver@...gle.com>
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 Wed, 6 Nov 2024 10:22:15 +0100
Marco Elver <elver@...gle.com> wrote:

> 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.

Thanks for letting me know. Let me see if I can fix that!

-- Steve