linux-kernel - Re: [PATCH v2 1/1] sparc: fix accurate exception reporting in copy_{from,to}

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Message-ID: <yddjz2i64j9.fsf@CeBiTec.Uni-Bielefeld.DE>
Date: Mon, 01 Sep 2025 09:00:26 +0200
From: Rainer Orth <ro@...iTec.Uni-Bielefeld.DE>
To: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc: Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>,
  linux-kernel@...r.kernel.org,  sparclinux@...r.kernel.org,  Andreas
 Larsson <andreas@...sler.com>,  Anthony Yznaga <anthony.yznaga@...cle.com>
Subject: Re: [PATCH v2 1/1] sparc: fix accurate exception reporting in
 copy_{from,to}_user for M7

Hi Adrian,

> 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.

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University