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

From	Thomas Gleixner <tglx@linutronix.de>
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	2025-09-25 00:20 +0200
Message-ID	<LyG0b-kiL-5@gated-at.bofh.it> (permalink)
References	(2 earlier) <LxSG5-hmA3-1@gated-at.bofh.it> <Ly8Bb-hxUe-3@gated-at.bofh.it> <LyBtv-haG-9@gated-at.bofh.it> <Ljo5b-7khn-1@gated-at.bofh.it> <LyBtv-haG-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 3 groups.

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On Wed, Sep 24 2025 at 19:20, Thorsten Sperber wrote:
> [Mi Sep 24 14:10:21 2025] NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0.
> [Mi Sep 24 14:10:21 2025] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.43+deb13-amd64 #1  Debian 6.12.43-1
> [Mi Sep 24 14:10:21 2025] Hardware name: HP ProLiant MicroServer Gen8, BIOS J06 04/04/2019
> [Mi Sep 24 14:10:21 2025] RIP: 0010:intel_idle+0x55/0x90
> [Mi Sep 24 14:10:21 2025] Code: 2d 5c 8c 40 00 eb 47 cc cc cc 48 89 f0 0f 1f 00 31 c9 48 89 ca 0f 01 c8 48 8b 06 a8 08 75 0b b9 01 00 00 00 4c 89 c0 0f 01 c9 <f0> 80 66 02 df f0 83 44 24 fc 00 48 8b 06 a8 08 74 0b 65 81 25 a6
> [Mi Sep 24 14:10:21 2025] RSP: 0018:ffffffff9d203e38 EFLAGS: 00000046
> [Mi Sep 24 14:10:21 2025] RAX: 0000000000000001 RBX: 0000000000000002 RCX: 0000000000000001

That's a MWAIT(C1 Substate 1). Hmmm...

> # cat /proc/cmdline
> BOOT_IMAGE=/vmlinuz-6.1.0-40-amd64 root=/dev/mapper/thecube--vg-root ro quiet intel_iommu=off intel_idle.max_cstate=2
>
> # cat /sys/devices/system/cpu/cpuidle/current_driver
> intel_idle
>
> # ls -l /sys/devices/system/cpu/cpu0/cpuidle/
> insgesamt 0
> drwxr-xr-x 2 root root 0 24. Sep 19:14 state0
> drwxr-xr-x 3 root root 0 24. Sep 19:14 state1
> drwxr-xr-x 3 root root 0 24. Sep 19:14 state2
>
> # cat /sys/devices/system/cpu/cpu0/cpuidle/state*/name
> POLL
> C1
> C1E

What's the output for the above on 6.12?

Thread

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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