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

First of all, thanks a lot for trying to help.

I have run the disk utility. Here are the results;

And I tried to thin the localsnapshot too. That seems not working for me as well. Here is the output:

Last login: Sun Apr 1 20:38:57 on console

Buraks-MacBook-Pro:~ Burak$ tmutil listlocalsnapshots /

com.apple.TimeMachine.2018-03-25-021312

Buraks-MacBook-Pro:~ Burak$ tmutil thinlocalsnapshots / 1000000000

Thinned local snapshots:

Buraks-MacBook-Pro:~ Burak$ tmutil thinlocalsnapshots / 1000000000 1

Thinned local snapshots:

Buraks-MacBook-Pro:~ Burak$

I tried that as well:

Buraks-MacBook-Pro:~ Burak$ sudo tmutil thinlocalsnapshots / 1000000000 1

Password:

Thinned local snapshots:

Buraks-MacBook-Pro:~ Burak$ sudo tmutil listlocalsnapshots /

com.apple.TimeMachine.2018-03-25-021312

Buraks-MacBook-Pro:~ Burak$ sudo tmutil deletelocalsnapshots 2018-03-25-021312

Error parsing argument 2018-03-25-021312

Buraks-MacBook-Pro:~ Burak$

I have this problem too with tmutil - if I try tmutil thinlocalsnapshots / OR tmutil deletelocalsnapshots 2018-04-22-102233, the response is always "failed to thin local snapshots" OR "failed to delete local snapshot ....."

I tried with sudo and also the same issue - it does not prompt for password, just executes the command that fails.

help??

I ALMOST formatted my SSD to resolve this error, but I'm glad I saw your answer first! The error is resolved!

Just one quick bit of feedback... you might want to edit your response to replace the word "dateless" with the correct word, "dataless." While it's somewhat insignificant, there might be pepo[le honing in on that one keyword, and if they searched for "dataless," your solution might not show up for them in Google.

Anyhow, thanks again for taking the time to share!

Hi, all -

I have tried the suggestions listed in this thread, but I'm getting a different error. Here's my terminal output (I'm doing this in single-user mode, so I'm retyping from photos I took, so sorry for any typos):

localhost:/ root# sudo fsck -fy

[skipping output to errors]

handle_crypto_mount:814: handling crypto mount (volume /dev/disk1s1)

handle_crypto_mount:996: crypto mount finished w/apfs

dev_init:476: Using /private/var/vm/apfs and /private/var/vm/nx for device-io.

[skipping things again...]

error: snap_metadata_val object (oid 8x7915c): invalid extentref_tree_oid (0x0)

Snapshot metadata tree is invalid.

** The volume /dev/rdisk1s1 could not be verified completely.

apfs_vfsop_unmount:1523: fake mount for going away

apfs: total mem allocalted: 3779403 (4 mb):

localhost:/ root# sudo /sbin/mount -uw /

[...]

apfs_vfsop_sync:3020: failed to finish all transactions in sync()! (err 16)

spaceman_trim_free_blocks:3009: scan took 5.986332 s, trims took 5.420211 s

spaceman_trim_free_blocks:3017: 12991201 blocks free in 276005 extents

spaceman_trim_free_blocks:3025: 12991201 blocks trimmed in 276005 extents (19 us/trim, 50921 trims/s)

spaceman_trim_free_blocks:3028: trim distribution 1:97010 2+:48375 4+:52100 16+:37641 64+:26673 256+:14206

localhost:/ root# tmutil listlocalsnapshots /

com.apple.TimeMachine.2018-04-25-151259 (dataless)

[...others listed that aren't dataless...]

localhost:/ root# sudo tmutil deletelocalsnapshots 2018-04-25-151259

Failed to delete local snapshot '2018-04-25-151259'

localhost:/ root# sudo tmutil delete 2018-04-25-151259

2018-05-14 00:08:17.321 tmutil[16:477] Failed to take user idle sleep power assertion (IOPMAssertionCreateWithName returned -536878199)

2018-04-25-151259: No such file or directory (error 2)

Total deleted: 0B

localhost:/ root#

As you can see, it does not delete the snapshot and doesn't offer any further explanation, at least in the first attempt. It may be possible that the com.apple.[etc] prefix is required with the plain tmutil delete command, so I'll try that and update this post.

In the meantime, does anyone have any idea as to why I can't delete the snapshot, even though I seem to be entering the command correctly? It's bizarre that it says it didn't delete the snapshot but doesn't explain why...

Thanks!

Hi, all -

I tried a couple of things, but they didn't work:

• I tried adding the prefix com.apple.[etc] to the snapshot name when using sudo tmutil delete, but it didn't help. Same errors.
• On the hunch that maybe the "idle sleep power assertion" error I got had something to do with the fact that my laptop wasn't plugged in at the time, I tried doing the commands again after having attached the power supply and rebooting. No change. Same errors. I just realized that there was a typo in my first post, though. Here's the correct number:

  IOPMAssertionCreateWithName returned -536870199

Any suggestions?

Many thanks

Thanks mate, worked. How on earth did you find out about this?

Appreciate the tip. It seems that with macOS X "another day, another defect". Mac OS 7.1 was a cakewalk compared to Mac OS X.

Hi there, worked like a charm. Thank you very much!

I'm with you Javier, it reappears! Anyone know of a permanent fix, or even Apple?

🙂

Thank you! Fixed my issue too (BTW, as you put in the example, you only need to enter the date and number in the delete command, WITHOUT the com.apple.TimeMachine. :-D

🙂

The same thing keeps happening to me; several times a week, I have to use tmutil to remove dataless snapshots.

Any suggestion as to how to avoid these would be great.

-N

You're a god! Why can't Apple handle this (I don't know, maybe delete dateless snapshots? or give a useful message on the error)... shame.

Thank you very much!

Thanks a lot for your help it worked for me too 🙂