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

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Message-ID: <875xd74i3a.ffs@tglx>
Date: Thu, 25 Sep 2025 00:10:49 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Thorsten Sperber <lists+debian@...o2k.de>, Uwe Kleine-König
 <u.kleine-koenig@...libre.com>
Cc: 1111027@...s.debian.org, "Rafael J. Wysocki" <rafael@...nel.org>,
 linux-kernel@...r.kernel.org
Subject: Re: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0

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?