Encrypted APFS volume suddenly not writable anymore

[oxland]

Hi folks.

I have an encrypted APFS volume in the same container as my startup disk and it's worked fine for months, but yesterday when I mounted it (via Disk Utility; I've disabled automount for it), it was mounted read-only. Reading works fine, I just can't write to it.

I've tried mounting it with "diskutil apfs unlockVolume" but that also mounted it read-only. Also tried rebooting, no joy.

Disk Utility shows "Writable: no" and "diskutil info" says "Volume Read-Only: Yes (read-only mount flag set)". "diskutil verifyVolume" found no problems. "diskutil apfs list" shows it with "No specific role" so at least it hasn't somehow gotten some weird role.

Any suggestions?

I'm on macOS 14.1 (23B74), MBP Pro 16-inch, 2021.

Edit: updated from 14.0 since it apparently had some problems with encrypted volumes, but it didn't help

 

[gilby101]

If you don't get a better solution:
1. Copy content elsewhere (skip this if you have a good backup);
2. Delete volume;
3. Create new volume;
4. Copy data back.

 

[oxland]

Yeah I figure I'll do exactly that, at least I can get it working again. It'd be nice to know how the hell the volume magically turned read-only, but I'm not exactly hopeful that anybody has any answers considering how janky macOS has been getting over the past few major versions.

If you don't get a better solution:
1. Copy content elsewhere (skip this if you have a good backup);
2. Delete volume;
3. Create new volume;
4. Copy data back.