From nobody Sun Feb 8 23:23:24 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 E5F5042188A for ; Wed, 4 Feb 2026 14:55:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770216939; cv=none; b=CZzAk0V0HoJx1cGmZWgbY5h7zgM4aILNWtbWntSrlxYHj1Q1CS+q8PM6wzydOG+7XTzuflYDgW6y6K/wVGwVPeRZVtmmN9D0nYdpW/1/DoBIIGAPDgghgPUhDeff9cdeVu//mB2wQbtPwLmEklt5x/JZCZ/BT2N6+TPbJJa16P4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770216939; c=relaxed/simple; bh=KVa8VWvbhQKvIriopPHHlNR0vTBDZhyOsZUnhGC72wA=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ooCbagLYC4g0OEhYG/bx+91PbjDxaQ1yCHyE1ZtNys7x6GG2DdmF5rxASbSVqZWqEPUmB33mLrkfxzUaQwU2ytJMTE6SNSyAFy1kkFeSGoxqxkyYtHF3XR9zCjc4rIXRnMJVYv0W0IMs1AUJbablstaNwrgPoIf/299suN3g7QI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=KbmsDtrR; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="KbmsDtrR" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1770216938; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8oc96eGDWBd34YoQhzQwIqlhjlF2jy/e1m69Oi5R+l4=; b=KbmsDtrRsUEsKFzFpXvlbvV41550ug6Tt7p0WqhzMAUamQOxyy+tz9l0tnHBZXz7WoJGa6 BJAwwAnJnYcuZKVFGhkSltTGTSIAyYOp53Ib+HujprONib0VNyxwjYN51bwyN8GmUyMY29 Qd6Zt4SZgok86gHxTrk33qglOQ0trYQ= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-26-SYGxsOCAPFyTZOxB7DJZXQ-1; Wed, 04 Feb 2026 09:55:34 -0500 X-MC-Unique: SYGxsOCAPFyTZOxB7DJZXQ-1 X-Mimecast-MFC-AGG-ID: SYGxsOCAPFyTZOxB7DJZXQ_1770216933 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 675511956070; Wed, 4 Feb 2026 14:55:33 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.22.88.140]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id E425130001A5; Wed, 4 Feb 2026 14:55:30 +0000 (UTC) From: Wander Lairson Costa To: Steven Rostedt , Gabriele Monaco , Nam Cao , Wander Lairson Costa , linux-trace-kernel@vger.kernel.org (open list:RUNTIME VERIFICATION (RV)), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2 17/20] rv/rvgen: enforce presence of initial state Date: Wed, 4 Feb 2026 11:42:43 -0300 Message-ID: <20260204144914.104028-18-wander@redhat.com> In-Reply-To: <20260204144914.104028-1-wander@redhat.com> References: <20260204144914.104028-1-wander@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Content-Type: text/plain; charset="utf-8" The __get_state_variables() method parses DOT files to identify the automaton's initial state. If the input file lacks a node with the required initialization prefix, the initial_state variable is referenced before assignment, causing an UnboundLocalError or a generic error during the state removal step. Initialize the variable explicitly and validate that a start node was found after parsing. Raise a descriptive AutomataError if the definition is missing to improve debugging and ensure the automaton is valid. Signed-off-by: Wander Lairson Costa Reviewed-by: Gabriele Monaco --- tools/verification/rvgen/rvgen/automata.py | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/verification/rvgen/rvgen/automata.py b/tools/verificatio= n/rvgen/rvgen/automata.py index 270a3d0bf4ce7..cf82f04dbc661 100644 --- a/tools/verification/rvgen/rvgen/automata.py +++ b/tools/verification/rvgen/rvgen/automata.py @@ -105,6 +105,7 @@ class Automata: # wait for node declaration states =3D [] final_states =3D [] + initial_state =3D "" =20 has_final_states =3D False cursor =3D self.__get_cursor_begin_states() @@ -131,6 +132,9 @@ class Automata: final_states.append(state) has_final_states =3D True =20 + if not initial_state: + raise AutomataError("The automaton doesn't have an initial sta= te") + states =3D sorted(set(states)) states.remove(initial_state) =20 --=20 2.52.0