How to track process which is opening /dev/watchdog and closing incorrectly causing “watchdog did not stop!“ message followed by system crash?

Issue

• How to track process which is opening /dev/watchdog and closing incorrectly causing “watchdog did not stop!“ message followed by system crash?

kernel: watchdog: watchdog0: watchdog did not stop!
kernel: watchdog: watchdog0: watchdog did not stop!

• Why does executing grep -R "No valid host was found" / causes system to reset with following message

"The watchdog timer reset the system" (iDRAC) 

UEFI0082: The system was reset due to a timeout from the watchdog timer. 
Check the System Event Log (SEL) or crash dumps from Operating Sysstem to 
identify the source that triggered the watchdog timer reset. Update the
firmware or driver for the identified device.