linux-kernel - NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0

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Message-ID: <tfwuhg7fxlvb3iix2k4qqh74dcmwgcipprlehy7zlaz3btmtym@2x2vsccw5yzs>
Date: Thu, 18 Sep 2025 10:27:11 +0200
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: 1111027@...s.debian.org, Thomas Gleixner <tglx@...utronix.de>, 
	Thorsten Sperber <lists+debian@...o2k.de>, linux-kernel@...r.kernel.org
Subject: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0

Control: forwarded 1111027 https://lore.kernel.org/lkml/tfwuhg7fxlvb3iix2k4qqh74dcmwgcipprlehy7zlaz3btmtym@2x2vsccw5yzs

Hello Rafael,

Thorsten (on Cc:) reported a bug against the 6.12.38 Debian kernel
running on an HP Microserver Gen8 after upgrading from an older Debian
release (which uses a kernel based on 6.1.y).

The problem is that the machine sometimes just hangs, requiring to
unplug the PSU to revive it.

A key hint seems to me a kernel message:

	[Fr Sep  5 21:12:34 2025] NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0.

(sometimes also "reason 61") that happens just before the hang. See
https://bugs.debian.org/1111027 for all the details.

I asked Thomas on irc if that rings a bell for him and he forwarded me
to you. Do you have an idea for a reason for this message and the
corresponding(?) machine hang? The bug reporter up to now was very
cooperative for debug measures (e.g. a BIOS update). I would expect him
to be open to support you if questions should arise or a patch should be
tested. A complication however is that the trigger for the problem is
unknown and it takes up to several days to happen.

Thanks in advance for your feedback,
Uwe

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