Warning: xf : INO_EXT_TYPE_DSTREAM when running First Aid of Disk Utility
Same here. Macbook Pro Retina, 2015, on Catalina 10.15. Mac locks up randomly about once a day, and I can't do anything except reboot via power button. 

Ran First Aid from Recovery Mode on "Macintosh HD - Data" and got this same sequence along with "Too many warnings of this type generated; suppressing subsequent ones."

I tried Apple Support Communities and didn't find anything exactly the same. Most were Mojave-related but it sounds like a clean reinstall might be required.