Kernel Log Error EXT4 on my cDAQ

Updated Oct 26, 2020

Reported In


  • cDAQ-9137

Operating System

  • NI Linux Real-Time

Issue Details

I receive error "Kernel Log Error EXT4-fs (sda4): couldn't mount as ext3 due to feature incompatibilities" after the system has been updated to LabVIEW 2018.


The problem is involving the Linux partitioning of the cDAQ's hard drive. The device will try to mount the root filesystem as previous versions of EXT before trying EXT-4. The filesystem might also be marked specifically as EXT-3, which would mean that mounting as EXT-4 would never be attempted in the first place.

Contact NI to perform a complete recovery of the controller. Fully reformatting the controller will update the boot table, which should then allow to mount the proper filesystem. 

Additional Information

Extended File System (often called EXT), is the name for how the Linux kernel stores files. It's possible that in the error you have multiple generations of it, with the latest being EXT-4.