How to disable watchdog?

I’m getting conflicting messages on how to do this. Is it by

A. adding nmi_watchdog=0 to kernel parameters
or by
B. adding nowatchdog to the kernel parameters and blacklist iTCO_wdt in a conf file in /etc/modprobe.d/

Do A and B have the same result or is B just the watchdog timer, whatever the difference is?

Sometimes “A” by itself doesn’t work.

“B” is the better option.

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I had to do both incl. blacklisting iTCO_vendor_support.

cat /proc/sys/kernel/watchdog gives me 0 as the output and I don’t see the watchdog daemon running anymore so I should be fine I guess.


I’m trying to solve some shutdown/startup problems and follwing this thread I used journalctl -p2 -b -2 to list critical boot errors. The result pointed me to this thread: kernel: watchdog: watchdog0: watchdog did not stop!

As I’m more or less a noob, I’d like to ask how I do these steps exactly:

I had to do both.