Cannot hide watchdog messages on linux 5.17.5-2-MANJARO

I added nowatchdog to the kernel parameters and wrote a file /etc/modprobe.d/watchdog.conf:

blacklist iTCO_wdtblacklist 
blacklist iTCO_vendor_support

and I ran:

sudo mkinitcpio -P
sudo update-grub

cat /proc/sys/kernel/watchdog gives 0

But watchdog did not stop still exists when reboot

  Host: ThinkPad Kernel: 5.17.5-2-MANJARO arch: x86_64 bits: 64
    Desktop: KDE Plasma v: 5.24.5 Distro: Manjaro Linux
  Type: Laptop System: LENOVO product: 20WKA000CD v: ThinkPad X13 Gen 2i
    serial: <superuser required>
  Mobo: LENOVO model: 20WKA000CD v: SDK0L77769 WIN
    serial: <superuser required> UEFI: LENOVO v: N35ET44W (1.44 )
    date: 01/28/2022
  ID-1: BAT0 charge: 54.7 Wh (100.0%) condition: 54.7/54.7 Wh (100.0%)
  Info: quad core 11th Gen Intel Core i7-1165G7 [MT MCP] speed (MHz):
    avg: 660 min/max: 400/4700
  Device-1: Intel TigerLake-LP GT2 [Iris Xe Graphics] driver: i915 v: kernel
  Device-2: IMC Networks Integrated RGB Camera type: USB driver: uvcvideo
  Display: x11 server: X.Org v: 21.1.3 driver: X: loaded: modesetting
    gpu: i915 resolution: 2560x1600~60Hz
  OpenGL: renderer: Mesa Intel Xe Graphics (TGL GT2) v: 4.6 Mesa 22.0.2
  Device-1: Intel Ethernet I219-V driver: e1000e
  Device-2: Intel Wi-Fi 6 AX210/AX211/AX411 160MHz driver: iwlwifi
  Device-3: Realtek RTL8153 Gigabit Ethernet Adapter type: USB
    driver: r8152
  Local Storage: total: 953.87 GiB used: 88.02 GiB (9.2%)
  Processes: 252 Uptime: 3m Memory: 15.35 GiB used: 2.89 GiB (18.9%)
  Shell: Zsh inxi: 3.3.15

the exact command is:
blacklist iTCO_wdt not blacklist iTCO_wdtblacklist

Try adding nowatchdog to your kernel command-line as well.

The ones I blacklisted

blacklist iTCO_wdt
blacklist iTCO_vendor_support
blacklist sp5100_tco

Feels like you reopen this thread every couple months.

Just to be sure, watchdog and nmi_watchdog are two different things:


The Linux kernel watchdog is used to monitor if a system is running. 
It is supposed to automatically reboot hanged systems due to unrecoverable software errors. 
The watchdog module is specific to the hardware or chip being used. 
Personal computer users don’t need watchdog as they can reset the system manually. 
However, it is useful for systems that are mission critical and need the ability to reboot 
themselves without human intervention.


A watchdog is usually a timer like mechanism which will generate an 
interrupt at a specified time interval.

An NMI is a non maskable interrupt.

So an NMI watchdog is a watchdog which will generate a non maskable interrupt, 
i.e. the interrupt handler will get executed no matter what the CPU state is.

This is very useful in scenarios where you are getting unexplained system freeze scenarios, 
as the NMI watchdog interrupt handler will simply kill whatever process 
happens to be freezing the CPU at the moment. 
This way, your CPU gets freed up AND you get a detailed stack trace of why your 
CPU got frozen up in the first place.

Disable watchdog:

blacklist the following as such:

blacklist iTCO_wdt 
blacklist iTCO_vendor_support

call file watchdog.conf and place in /etc/modprobe.d/

Disable nmi_watchdog:

In Grub add nmi_watchdog=0 and nowatchdog in kernel boot parameter and UPDATE GRUB

To check:

cat /proc/sys/kernel/nmi_watchdog
cat /proc/sys/kernel/watchdog

Should show 0
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