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Wysocki" , linux-kernel@vger.kernel.org Subject: Re: NMI: IOCK error (debug interrupt?) for reason 71 on CPU 0 In-Reply-To: References: <2pdp3kq4qebdxizprbnaq6omh4dvxdlktokvr37b7nlkf4po3b@fxzmgmi47wxx> <60c824f2-667f-4957-bfe1-145a79e01ac5@aero2k.de> <87bjn14g04.ffs@tglx> Date: Thu, 25 Sep 2025 00:10:49 +0200 Message-ID: <875xd74i3a.ffs@tglx> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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 7= 1 on CPU 0. > [Mi Sep 24 14:10:21 2025] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainte= d 6.12.43+deb13-amd64 #1=C2=A0 Debian 6.12.43-1 > [Mi Sep 24 14:10:21 2025] Hardware name: HP ProLiant MicroServer Gen8, BI= OS 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 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=3D/vmlinuz-6.1.0-40-amd64 root=3D/dev/mapper/thecube--vg-root = ro quiet intel_iommu=3Doff intel_idle.max_cstate=3D2 > > # 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?