From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.CeBiTec.Uni-Bielefeld.DE (smtp.CeBiTec.Uni-Bielefeld.DE [129.70.160.84]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B59BB13A244; Mon, 1 Sep 2025 14:18:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=129.70.160.84 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756736305; cv=none; b=PPdCHPxC5FAmSTaT7S+l/lrqTQtzdSqjSwIW07WbE7+n8iN2WijZ0tjtdgz0C+XRPUA5HZB+UQc17lMi7Ydf48emgRWovHlvQ361Sriplcx36uFSXTktmjHwNJzHxq/mpGGuEMIKSz4lo9pkTXH4lOOrzjdsahJ+8iwq71N2rP4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756736305; c=relaxed/simple; bh=HX0WaoTrp/btXeyLMGnRU3Iygy+Fmu4W+bVNct25BOw=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=AWoXDdtxQbvkP7EWxwiURQrwvxx6yvPJwPZzVHJcoCUtqqgKlb0/I4WqHHU/vJTlT+uMl3vuwbC1/M0W17vn+ml8laG1uQ/UATHLTLmz+waPUnDDQ6eabKeI4nkmNOOX+9iL6VVf6SoFExinhz7RCqtfRa3Uc8zwOi3kvmBngQU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=CeBiTec.Uni-Bielefeld.DE; spf=pass smtp.mailfrom=cebitec.uni-bielefeld.de; dkim=pass (2048-bit key) header.d=cebitec.uni-bielefeld.de header.i=@cebitec.uni-bielefeld.de header.b=BciIhNQn; arc=none smtp.client-ip=129.70.160.84 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=CeBiTec.Uni-Bielefeld.DE Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cebitec.uni-bielefeld.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=cebitec.uni-bielefeld.de header.i=@cebitec.uni-bielefeld.de header.b="BciIhNQn" Received: from localhost (localhost.CeBiTec.Uni-Bielefeld.DE [127.0.0.1]) by smtp.CeBiTec.Uni-Bielefeld.DE (Postfix) with ESMTP id 18B7AB9F5A; Mon, 1 Sep 2025 16:18:16 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d= cebitec.uni-bielefeld.de; h=content-type:content-type :mime-version:user-agent:message-id:date:date:references :in-reply-to:subject:subject:from:from:received:received; s= 20200306; t=1756736295; bh=HX0WaoTrp/btXeyLMGnRU3Iygy+Fmu4W+bVNc t25BOw=; b=BciIhNQnsGZQDzRfm2d0hPML6v/WYZf4DZH9v9bm02hicCUfD5Nv4 0yvZtymdEDxgkeSmhZvHVMlIgFgb1Qb5tdlUFfyu59qWbVkPdtWvzayA8p5EZ3/l CEgPWO4VfszOyKDn+d/i+4By7CtSwGlZPAj7y/z47kvoBCgWgPhvK62RQ+YBjTh4 Rna7o8EK5QyJkjTt1bYEjOBpBVRhst9mKS3XgdIu9xjtw1gY5BD/orMt2tiNHzeL zGDbW8vs7fQ+NVXvu6GYKg/s4YVbpeqaKX2nv/ASPF++cdMWjwxlGp2r/oqxoWSL vlC9v6ACiTSrT2vWNKvZjl2UYbRmPrwuQ== X-Virus-Scanned: amavisd-new at cebitec.uni-bielefeld.de Received: from smtp.CeBiTec.Uni-Bielefeld.DE ([127.0.0.1]) by localhost (smtp.cebitec.uni-bielefeld.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id SY2vdEiCoxuz; Mon, 1 Sep 2025 16:18:15 +0200 (CEST) Received: from manam.CeBiTec.Uni-Bielefeld.DE (p50854244.dip0.t-ipconnect.de [80.133.66.68]) (Authenticated sender: ro) by smtp.CeBiTec.Uni-Bielefeld.DE (Postfix) with ESMTPSA id 3A00DB9F59; Mon, 1 Sep 2025 16:18:15 +0200 (CEST) From: Rainer Orth To: John Paul Adrian Glaubitz Cc: Michael Karcher , linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, Andreas Larsson , Anthony Yznaga Subject: Re: [PATCH v2 1/1] sparc: fix accurate exception reporting in copy_{from,to}_user for M7 In-Reply-To: <4c92d08cff24c04023bff8555ecf3bbd2eb0e944.camel@physik.fu-berlin.de> (John Paul Adrian Glaubitz's message of "Mon, 01 Sep 2025 09:05:58 +0200") References: <20250828130456.2335-1-kernel@mkarcher.dialup.fu-berlin.de> <240f0f51687dcb146656a47932ec075b0821b605.camel@physik.fu-berlin.de> <4c92d08cff24c04023bff8555ecf3bbd2eb0e944.camel@physik.fu-berlin.de> Date: Mon, 01 Sep 2025 16:18:14 +0200 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Precedence: bulk X-Mailing-List: sparclinux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Hi Adrian, > On Mon, 2025-09-01 at 09:00 +0200, Rainer Orth wrote: >> > in the past, you reported stability issues with the Linux kernel when running >> > inside an LDOM on SPARC M7/M8. Could you verify whether the patch above fixes >> > these problems or whether at least they don't introduce regressions? >> >> thanks for the heads-up. Indeed the hangs persist even when the system >> is idle. However, I've never built a Linux kernel before and have way >> too much on the plate to try now. Besides, I don't have a reproducer >> for the issue, so even with a patch I'd have to wait for an extended >> period of time to see if the issue is gone, so I'll just wait until the >> patch lands in the Debian/sparc64 repo and see if it helps. > > Would it work if I built a kernel for you plus installation instructions > and a quick explanation how to test it? I wouldn't mind trying, but as I said it's difficult to say when I can claim success given the lack of a reproducer. All I can report reliably is failure ;-) > FWIW, we consider the patch already acceptable when it doesn't introduce > any regressions. > > I did some testing on a SPARC S7 yesterday, but the problem is that the > support for SPARC S7 in the Linux kernel is incomplete at the moment and > I had to add it quickly myself which did actually work but I really would > like to verify it on M7 or M8 again to at least not cause regressions. The only system that I can test on is S7 (a Netra S7-2 actually). While I also have a T8-1, that's reserved for cfarm work. Rainer -- ----------------------------------------------------------------------------- Rainer Orth, Center for Biotechnology, Bielefeld University