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error: snap_metadata_val object (): invalid extentref_tree_oid (0x0)

After upgrading to High Sierra on an 2011 MacBook Air, when running Disk Aid on the boot disk (auto-converted to APFS) I get this error:


error: snap_metadata_val object (oid 0xe79f): invalid extentref_tree_oid (0x0)


it still says the check completed sucessfuly, but this error looks not benign. I also booted in recovery mode and get the same error.

MacBook Air (13-inch Mid 2011), macOS High Sierra (10.13)

Posted on Sep 29, 2017 12:11 PM

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Question marked as Top-ranking reply

Posted on Oct 6, 2017 1:18 PM

I have the same error as you. In my case it turned out to be a dateless time machine local snapshot.


To check for it, open a Terminal and list local time machine snapshot by running the
command "tmutil listlocalsnapshots /"

It will show entries like "com.apple.TimeMachine.YYYY-MM-DD-HHMMSS"

If you see dateless snapshot, delete it use "sudo tmutil deletelocalsnapshots YYYY-MM-DD-HHMMSS"
with the actual date of the dateless entry. You will need to enter your user password.


# tmutil listlocalsnapshots /

com.apple.TimeMachine.2017-10-04-014927 (dataless)

com.apple.TimeMachine.2017-10-04-024750

com.apple.TimeMachine.2017-10-04-024752

com.apple.TimeMachine.2017-10-04-024835

com.apple.TimeMachine.2017-10-04-024852


# sudo tmutil deletelocalsnapshots 2017-10-04-014927

Password:

Deleted local snapshot '2017-10-04-014927'


# tmutil listlocalsnapshots /

com.apple.TimeMachine.2017-10-04-024750

com.apple.TimeMachine.2017-10-04-024752

com.apple.TimeMachine.2017-10-04-024835

com.apple.TimeMachine.2017-10-04-024852

54 replies

error: snap_metadata_val object (): invalid extentref_tree_oid (0x0)

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