From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DCCBC421227; Thu, 27 Aug 2026 12:07:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787832478; cv=none; b=EIRO9NTB2v6pjhLdpazmDEymrCScmC4Hv36pekT0uUZ933rLG2nwFCt17KSvdNM8Trtn2dqcX3Yk+6fHo/tkvILJ4DiR3PcF/o7iV9SJtjKQUk/kW8ebphsvnO8ngh8Q5zuJFKd9+NGXQ4weqp0s5cGEi7YGrqONqDpORWqWD4Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787832478; c=relaxed/simple; bh=J0PiKCqqvozDaXTK1qBu7BVn4q6Ey0mJmZ91aBD+U34=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=UfF2wh+p9/JNqMLnvc/1ipU+xULaKOVbobk2lCi3lODkqspyv0T8ImUg4NVcPKgAyN1/FMXYJxQUk9Axuq2vBVDCNpf9eTo1/1WybDvk0zkHKhj6d1d8G08jpxRzWqYkd4xXI0hYgLlf4JuJRXWEL6TRu5aFOUXTU/O7sOTdyJo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; dkim=pass (1024-bit key) header.d=goodmis.org header.i=@goodmis.org header.b=yyN1CkJ0; arc=none smtp.client-ip=216.40.44.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=goodmis.org header.i=@goodmis.org header.b="yyN1CkJ0" Received: from omf04.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 3CB1CA3C22; Thu, 27 Aug 2026 12:07:54 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf04.hostedemail.com (Postfix) with ESMTPA id 51A0A2002D; Thu, 27 Aug 2026 12:07:52 +0000 (UTC) Date: Thu, 27 Aug 2026 08:08:39 -0400 From: Steven Rostedt To: =?UTF-8?B?SsOpcsOpbXk=?= Jean Cc: mhiramat@kernel.org, mathieu.desnoyers@efficios.com, brads@mainlining.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v2] tracing/user_events: Clear copied tracing state before fork duplication Message-ID: <20260827080839.35e44d04@gandalf.local.home> In-Reply-To: <20260826214414.1971632-2-Jeremy.Jean@oss.cyber.gouv.fr> References: <20260826214414.1971632-2-Jeremy.Jean@oss.cyber.gouv.fr> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 51A0A2002D X-Stat-Signature: buiz1t5rx9trs5hepmek5sctm6r91a73 X-Rspamd-Server: rspamout07 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX1988ENOYCIU8H17Ec/Kmbx3v/QRwI7YBW4= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=goodmis.org; h=date:from:to:cc:subject:message-id:in-reply-to:references:mime-version:content-type:content-transfer-encoding; s=dkim1; bh=yh6MsLLU+MMkHmVUoIFgI73amxCC+WQRuG0iaGy9p08=; b=yyN1CkJ0xnXDNZUXNDPtkAKxqn9E34yL4RLqAzXCx/YF+wHfm7X9OUNHq3XWbVgQmEeNmFuXpOhM+UfpD/O4x5GPavycfYfQkBi3ex1OzPRVUTlSWSOViO1frUiN3ZrnHoch2jHuT4T6GhGVuGYn9W2FpsLg1Bdp+8+fkMLE7Rc= X-HE-Tag: 1787832472-290276 X-HE-Meta: U2FsdGVkX1/JFXqQ5yafWTxb9mNMK5Ht2yZ1xOHAUh6ZdV34hMeXOCALUDY8TWudmQ5QKJgetOAcjyXsZgj6h7LO7HOYGW+qVW8f1zjTTcSbqdyE7teAWfSEmjYdfJY0m6hj1u9BoCh9JlupSiNeXWzI5YK/kC8p8td8JzVLaK9SHoMHN6GCa/zYidUos9Awrm6hF6iuh8GG31P8R+rN0NQgkmEYD6IGZlf4gV8WXq8kcbjZcWmbpFVuJi896AbGDtu8S/22XKUDW5cmcZ6T8f1o6yIszRrJGAWiuNQdfIFfCCY+nFp2YKaXZ82u1Sz2 On Wed, 26 Aug 2026 21:44:15 +0000 J=C3=A9r=C3=A9my Jean wrote: > diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events= _user.c > index 2bbc89d4a266..339e18085af3 100644 > --- a/kernel/trace/trace_events_user.c > +++ b/kernel/trace/trace_events_user.c > @@ -865,9 +865,12 @@ void user_event_mm_remove(struct task_struct *t) > =20 > void user_event_mm_dup(struct task_struct *t, struct user_event_mm *old_= mm) > { > - struct user_event_mm *mm =3D user_event_mm_alloc(t); > + struct user_event_mm *mm; Why this change? > struct user_event_enabler *enabler; > =20 > + t->user_event_mm =3D NULL; > + mm =3D user_event_mm_alloc(t); I don't see why you moved the mm assignment down here. The t->user_event_mm is not used in user_event_mm_alloc(). -- Steve > + > if (!mm) > return; > =20