Odd watchdog message upon reboot

A few patches ago I started getting this message upon reboot:

[22975.802578] watchdog: watchdog0: watchdog did not stop!
[22975.823515] sd-umoun[16370]: Failed to unmount /oldroot: Device or resource busy
[22975.823799] sd-umoun[16371]: Failed to unmount /oldroot/sys: Device or resource busy
[22975.824192] shutdown[1]: Failed to finalize file systems, ignoring.
[22976.538911] reboot: Restarting system

Apologies if there are typos. I had to type it from a photo of the screen as it flashes by pretty fast. It does not happen upon shutdown, but only on reboot. Might this have something to do with changing from ext4 to BTRFS? Does “sd-umoun” refer to a SD-disk? I have one, but it is not in use for Manjaro (or at least shouldn’t be) and is reserved for Windows 10 OS files and is normally not mounted on startup as I have no need for it, only the files I have on a regular HD partition.

What could be the cause and what can be done?

I also encountered the same problem,but I only know how to solve the “watchdog did not stop!” 。


  1. append nowatchdog to your boot parameters.

  2. blacklisting the related module, e.g. iTCO_wdt.

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