Some macOS Monterey users are seeing an unusual “Volume Hash Mismatch” error, notifying them of a detected hash mismatch and advising to reinstall macOS on the volume. The complete error message states:

“Volume Hash Mismatch – Hash mismatch detected on volume disk1s5. macOS should be reinstalled on this volume.”

Certain users face this issue after a major system crash or kernel panic, with the error recurring repeatedly afterward.

In some cases, the “Volume Hash Mismatch” error leads to noticeable instability on Macs running macOS Monterey, causing frequent app crashes. Other users see the error constantly appearing without any apparent effect on the system's stability.

Troubleshooting “Volume Hash Mismatch” on MacOS Monterey

If you encounter this error, it is advisable to immediately back up all data on your Mac using Time Machine or another preferred backup method, in case something goes wrong or the system becomes unusable.

Once the Mac is backed up, reinstalling macOS on Apple Silicon Macs or Intel Macs is recommended.

It’s also worth resetting PRAM / NVRAM and performing an SMC reset (note that resetting the SMC on 2018 model MacBook Pro and Air with T2 chip differs from earlier models) if you own an Intel-based Mac. These options are not available on Apple Silicon Macs.

Interestingly, many users continue to experience the same issue even after reinstalling macOS Monterey, indicating further troubleshooting might be necessary, or a fix may come from Apple through a future macOS Monterey update.

Another potential solution involves downgrading from macOS Monterey to macOS Big Sur using a Time Machine backup or disk image, though this may not be practical for most users.

What causes the “Volume Hash Mismatch” Error?

The exact cause of the hash mismatch error remains unclear, as users have reported it appearing randomly or following a significant system crash or kernel panic.

For example, I encountered this error on an Intel Retina MacBook Air while installing software via cask in Terminal and attempting to enable High Contrast mode through Accessibility settings. Suddenly, all apps crashed, Finder entered a loop of crashes, and the machine had to be manually restarted by holding the Power button. After rebooting, the error appeared. Reinstalling macOS Monterey did not eliminate the error, which continues to show up after each restart. However, resetting SMC and NVRAM after reinstalling macOS seems to temporarily remove the message.

Other online reports include the message showing up unexpectedly and returning after reboot.

Some users observe the error when running macOS Monterey on a Mac that isn't officially supported.

This Volume Hash Mismatch error doesn’t seem to be related to memory leaks or other known issues in macOS Monterey. Some speculate it could be tied specifically to Monterey and certain SSD configurations.

This error was first observed during the Monterey beta phase in Apple developer forums, but now with the stable release available to the public, more users are encountering it, and discussions about it are increasingly visible on general Apple Support forums.

Have you encountered the “Volume Hash Mismatch” error on your Mac? Did reinstalling macOS resolve the problem? Or did you find another workaround? Share your experiences and thoughts in the comments below.

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