This is means that your Mac Pro is crashing (kernel dumping) and saving Panic logs inside the NVRAM volume.
You have to find the cause of the KPs.
Mac Pro NVRAM volume is made up of 5 stores:
- Primary VSS store
- Secondary VSS store
- FTW store
- Fsys store
- Gaid store
One and two are dinamic and where the NVRAM entries are stored, three to five are saved while the Mac Pro was in the production line with several different types of data (like serialization, sensor calibration and etc) and never written again, with read only access.
One of the most common failures is the Secondary VSS store header being corrupt, with the area that stores the size of the store being overwritten. This is a extremely common defect with cross-flashed early-2009s and less common with mid-2010/mid-2012s that if is not solved with a deep NVRAM reset, will require a BootROM reconstruction service for repair the damage.
Is very possible that the PanicInfoLog being saved inside the primary VSS store while the Mac Pro was crashing caused the corruption.
You have to find the cause of the KPs and repair the BootROM or you soon will have to repair a brick instead.
Never inject anything to a damaged BootROM image.