macOS Sequoia 15.4.1 – Disk Space Rapidly Disappearing Due to System Processes on macbook pro m2

Hi everyone,


I recently updated to macOS Sequoia 15.4.1 (24E263) and started experiencing a serious issue with my disk space. After a restart, I typically have around 80–90 GB of free space — but that space rapidly disappears until only about 980 MB remains. At that point, it stops decreasing, but it's still unusable.


Using Activity Monitor, I noticed that:


  • First, the idleassetsd process was writing an enormous amount of data.
  • After restarting (which seemed to temporarily fix it), the issue returned — this time with kernel_task as the culprit.


I tried switching to a static desktop background after reading that idleassetsd might be related to dynamic wallpapers, but it didn't help with the kernel task writing issue. Restarts don't help anymore either.


I’ve searched the forums and found some posts about similar symptoms, but nothing definitive — just a lot of speculation. Has anyone experienced the same thing or found a reliable solution? This is becoming quite frustrating, as my available disk space keeps "melting" away without any apparent reason.


Any help or insight would be greatly appreciated!


Thanks in advance.

MacBook Pro 13″, macOS 15.4

Posted on Apr 23, 2025 1:14 AM

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Posted on May 28, 2025 9:55 PM

OMG. So I finally flipped the table and downloaded GrandPerspective. It very quickly and very clearly revealed a single log file in /private/var/folders taking up 85GB! It seems running the Cortex-Debug extension in Visual Studio Code quietly accumulates a massive log in the background. I hadn't used it for weeks, but it was still doing something.



I killed VSCode, did a big purge of /private/var/folders (very unclear how to do this properly, so I went carefully and thoroughly), and now, 2 weeks later, the problem has not returned. I still have 200GB free. "System Data" continues to bounce around wildly. From 101GB to 57GB and back to 101GB as I type this.


Lessons:

  1. "System Data" is a very loose description. No wonder the "solutions" to this problem are so varied. The log file was obviously a user land file, but it seems even application temporary files can be "System Data".
  2. The number associated with "System Data" is bizarre. Take it with a big grain of salt.
  3. Storage management is just too complicated to leave to general hygiene or even the "Storage" view in System Preferences. Don't delay - get GrandPerspective.
  4. VSCode extensions are the wild west - loose cannons that shoot at will.
31 replies

Apr 24, 2025 12:07 PM in response to sircsak

Here is the report.

In the meantime, the issue persists and I couldn't figure out what triggers it. I'm using my mbp as per usual and seemingly everything is okay until a moment when I start to receive messages that I'm running out of space. It doesn't happen when I run a particular program or perform something that I could connect this to, it happens randomly. If and when I restart the computer everything goes back to normal, I get back the free space, at least for some time, and then the whole thing starts over.

This issue started after the update to the current OS version, nothing else changed, nothing new was used, etc.

Apr 25, 2025 4:12 AM in response to Owl-53

Thank you for the reply Owl-53. IMHO this explanation is not and can't be right.


This computer was purchased a little bit more than a year ago, brand new from the store. I used it without any issues for all this time, even with much less space on the hard drive.

  • All of a sudden it starts to eat up the free space, only as much as I have (there is no exact free space requirement like it needs 50Gb and that's it).
  • All this happens from one day to another and the only change that happened on the computer was an installed OS update, nothing else (no other program installed, no difference in use, etc).


I could understand sudden shrinking with the space if there was eg a hard drive failure and bad sectors would start to grow or whatsoever but to say 'sorry the OS randomly requires more space starting from today' just can't be right.

I'm quite positive if I had purchased an HDD with higher capacity, eg 1TB, still the same would happen (kernel would eat up all the space available until restart), it would have been just less noticeable as it would run out of space later. So I have serious doubts this is a normal operation.


Something triggers this and I'm here to find the root cause, not to get advice to solve it by buying a larger HDD so I won't notice that was not an issue ever before ÷) Thank you though for reading through the log!

Apr 25, 2025 4:53 AM in response to sircsak

You are welcome


None the less, the etrecheck report indicates otherwise


A 256 GB SSD drive may seem large at the time of purchase and if we factor in Costs for a larger drive


Though, from my observations and personal experience


Sometimes we can not forecast or anticipate what our future needs may be


Then, in this situation we are stuck with what we purchased ( 256 SSD soldered to the Logicboard )


Meaning there is no way to replace the drive with something larger


Apr 25, 2025 5:50 AM in response to Luis Sequeira1

Hey Luis, thank you for the reply.


OneDrive is a strange thing because it has been deleted some time ago (approx a year before this issue appeared). These daemons, however, keep popping up even after I deleted them (Library/LaunchDaemons). Do you have any idea why or how could I get rid of them permanently? Could this mess with the free space even after the app was deleted?


Regarding Library/Extensions:

  • the two HP extension likely related to the printer driver. As it is an older printer (HP LaserJet Pro M127fn) certain functions don't work without it. Do you think it is safe just to delete these extensions from this folder?
  • Jabra application has been deleted some time ago, I assume it is safe to delete this extension too
  • SXUPTP I have no idea what it is. Should i just delete it?


Thank you!


May 11, 2025 9:08 PM in response to sircsak

Yeah this is nuts.


2022 Mac Studio with 1TB SSD running Sequoia 15.4.1. I always keep a couple hundred GB free.


Then one day "you've run out of space". Time Machine can't backup. Can't upgrade the OS. My workhorse of a machine is on its knees.


I'm super diligent about upkeep, so wondered what I'd overlooked. Turns out it's 296GB of "System Data" that grew overnightx. I've deleted GBs of files to try to give me enough space to do critical tasks, but the next day its all used up again.


Right now "MailStorageManagement" is using 68% of one CPU and "ApplicationStorageExtension" another 45%.


I'm sure mining all my data is going to make Apple Intelligence at least 0.5% less preposterously annoying than it is now, but please can I just use my computer for a bit instead?


To answer your question about idleassetsd - I only have a single file in that folder. A 445MB mov of the animated screensaver. Shouldn't be a problem on a 1TB drive.

May 12, 2025 5:27 PM in response to Liteyear

Update: I deleted another 30GB of files and then quickly upgraded to 15.5 before it got gobbled up again. After the reboot I have 200GB free again. Go figure.


As I'm typing this, I can see available space rapidly falling again. Down to 190GB now.


So do we just need to ensure we have 250+GB free for MacOS to slosh around in these days? Allowing some space for virtual memory and some breathing room, I suppose that means oversizing your disk by 350GB or more? Isn't the future great?

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macOS Sequoia 15.4.1 – Disk Space Rapidly Disappearing Due to System Processes on macbook pro m2

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