Volume Hash Mismatch?

[Kiki61]

Recently upgraded to OS 12.6.6 earlier in the week, and am now getting the message "Volume Hash Mismatch." I have never seen this before. Anyone else having this problem?

Beside reinstalling the macOS as recommended by the message, any other suggestions?

Guess I'm concerned as responses across the internet point to more serious issues beyond what a reload or Disk Utility can repair. Being between projects at the moment, the last thing I can afford is to either rapir or replace my laptop.

The only program I'm having issue with (that I know of so far) is Apple Mail, as I can't click on open email messages, as they wither reload or go blank.

 

[Kiki61]

I went ahead and ran Disk Utility (without rebooting), and it came back that nothing was wrong with the drive.

The Apple Mail issue seems to be coming and going - Sometimes you can click on the messages and links, sometimes not (it's working at the moment).

Didn't know if I should go ahead and reload the system, or just let it go for the moment.

 

[f54da]

Apple’s big test of data integrity

Since November 2020, every T2 and Apple silicon Mac that has booted Big Sur or later in Full Security mode has check the integrity of its 9 GB SSV.

eclecticlight.co

Some file on the signed system volume has been modified, causing hash validation to fail. I'd make sure you start taking backups, since unless you've been messing around with SIP the only thing that would cause this is bit flips on your storage medium. Maybe check RAM as well.