Bug#1111027: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0

From	Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Newsgroups	linux.debian.bugs.dist, linux.kernel, linux.debian.kernel
Subject	Bug#1111027: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0
Date	2025-09-18 10:30 +0200
Message-ID	<LwibD-gg1L-3@gated-at.bofh.it> (permalink)
References	<Ljo5b-7khn-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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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Bug#1111027: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0 Uwe Kleine-König <u.kleine-koenig@baylibre.com> - 2025-09-18 10:30 +0200
  Bug#1111027: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0 Uwe Kleine-König <u.kleine-koenig@baylibre.com> - 2025-09-18 11:10 +0200
    Bug#1111027: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0 Thorsten Sperber <lists+debian@aero2k.de> - 2025-09-22 19:40 +0200
      Bug#1111027: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0 Thomas Gleixner <tglx@linutronix.de> - 2025-09-23 12:40 +0200
        Bug#1111027: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0 Thorsten Sperber <lists+debian@aero2k.de> - 2025-09-24 19:30 +0200
          Bug#1111027: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0 Thomas Gleixner <tglx@linutronix.de> - 2025-09-25 00:20 +0200
            Bug#1111027: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0 Thorsten Sperber <lists+debian@aero2k.de> - 2025-09-25 17:30 +0200

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