Questions tagged [nmi]

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Custom interrupt handler for the NMI hardware button

I'm trying to create a custom interrupt handler for the NMI hardware button which exists on my motherboard. To test this functionality I've created this simple module: #include <linux/init.h> #...
1
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0answers
41 views

Can't disable NMI watchdog on Debian Buster in vmware context - couldn't write to kernel, unknown error 524

Following instructions, I want to disable the NMI watchdog on boot. sudo sh -c "echo '0' > /proc/sys/kernel/nmi_watchdog" However: Couldn't write '0' to 'kernel/nmi_watchdog': Unknown error 524 ...
0
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1answer
550 views

How to have the kernel print a stacktrace when sending a Hardware NMI

I have Qemu VMs running FreeBSD, Windows and Linux, and I can send them a hardware NMI via the Qemu monitor. qm monitor 100 Entering Qemu Monitor for VM 100 - type 'help' for help qm> help nmi nmi ...
7
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1answer
9k views

Should I disable NMI watchdog permanently or not?

Why we need to keep the nmi_watchdog enabled and what could happen if I disable it permanently ? As some applications recommends to disable NMI watchdog to work properly, what's the advantage of ...
6
votes
1answer
890 views

What does ACPI NMI LINT mean? and Why it changes across kernel version?

I'd like to understand what the following lines mean [ 0.000000] ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x0]) [ 0.000000] ACPI: NMI not connected to LINT 1! [ 0.000000] ACPI: LAPIC_NMI (...
10
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3answers
2k views

Unknown NMI reason 20 and 30 on a VM

I pulled up the console on a virtual machine I manage today and was greeted with some kernel messages: [5912557.130943] Uhhuh. NMI received for unknown reason 20 on CPU 0. [5912557.131115] Do you ...