UVFS service

2018 Intel MacBook Pro with a Bootcamp partition here, can confirm, my MacBook has been a mess since upgrading to 12.5. It has crashed to the point of rebooting several times on its own since the upgrade. I think that has only happened once or twice before this in 4 years of ownership.

Crash logs in Diagnostic Reports indicated mdsync to be to blame. When not crashing CPU was through the roof, with UVFSService and numerous spotlight related services such as mdsync, mds, md_stores, and mdworker_shared taking up way too much CPU. The fan was running at max all the time and computer was unusable.

Excluding the Bootcamp partition from Spotlight seems to have resolved my issue. CPU is back to normal and the fan is no longer running constantly.

The issue with the UVFSService going haywire stems from Spotlight attempting to index a BootCamp partition.

To completely eliminate this issue, go to the Spotlight panel in System Preferences and add your BootCamp partition to the "Privacy" tab.

@Hac-D-Mac's solution worked for me as well. I have a 2019 5K iMac with Core i9 and 40 GB of RAM and have been noticing occasional freezing and slowness since upgrading to 12.5. This is a very fast machine with a lot of cores and memory, so this was odd. Excluding my BOOTCAMP partition from Spotlight seemed to make my system immediately more responsive and UVFSService CPU usage dropped immediately from 40% to 0%. I think Apple must have introduced some kind of bug in Spotlight in this version of macOS. Maybe someone from Apple can forward this thread to the macOS engineering team so it can get fixed without needing a workaround.

In my case at least the solution was to exclude the Bootcamp partition from Spotlight which immediately solved the issue. After 24 hours, I can confirm the problem has not reappeared.

exclude bootcamp or any other NTFS drives from spotlight respect goes to has-d-mac ;)

I too have this issue. I have bootcamp installed and force quitting the UVFSService from Activity Monitor caused my MacBook Pro to become responsive again. I disabled Spotlight indexing via Terminal with `sudo mdutil -a -i off`

UVFSService constantly hogging CPU

And refer to Contributor @Old Toad

Coincidence maybe.

Technically speaking, Bootcamp creates a separate Partition on the Drive.

In some doing, macOS Monterey will not recognize the Separate Partition when booted in Monterey.

The reverse would occur when Option Booting into Windows.

Actually, running Monterey 12.5 and the UVFSService service does not even exist on this M1 Mac Mini

refer below

Kudos to Hac-D-Mac! I had upgraded to Monterey 12.5.1 and my mac kept hanging up shortly after rebooting. After several days of troubleshooting, I was nearly at the point of giving up and buying a new one. But after excluding Bootcamp from Spotlight, all is now fine!

Not a coincidence and you can from an Intel Mac running Monterey 12.5 see Bootcamp in Finder as shown below.

This worked for me too, thanks!

My mds_stores process is using way too much CPU!! I've added the Bootcamp partition to the excluded folders within Spotlight. Will see if this resolves the issue. Running Monterrey 12.5 update.

Anyone test if this is fixed in 12.6? I’ll probably just leave the bootcamp partition excluded from Spotlight, but would be nice to know whether Apple fixed it.

Awesome reply. Saved my system that was beach-balling non-stop.

It is not. I just applied my fix this week to FINALLY solve this issue. Found solution on Reddit.