Mac Studio - Regular Panic

This is the error i'm having, can anyone shed some light...?



panic(cpu 2 caller 0xfffffe0017e3298c): PAC failure from kernel with DA key while authing x16 at pc


Full log attached below




[Edited by Moderator]

Mac Studio, macOS 15.3

Posted on Feb 9, 2025 09:51 AM

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8 replies

Feb 9, 2025 12:06 PM in response to Barney-15E

Classic Debugging steps:

Make certain you have applied all available software updates, because no one is willing to debug a problem that might have been seen and solved already.


Then you need to go through the 'regular’ steps to eliminate added software as the cause of the problem:


• Run In Safe Mode, where no third-party add-ons are loaded

• create a new "clean" User account, and run with that to eliminate contamination in your regular User account

• run the diagnostic to check for GROSS issues. "no fault found" is not the same as "all is well".


If you are seeing kernel panics, post a panic report. Some panic-reasons suggest a Hardware issue. There is a procedure that can allow you to find those reports to post one. Ask for assistance if you need it.


if you take it to an Apple service provider first, they CAN run their diagnostics, which are a bit more comprehensive that the User diagnostics. In the very small amount of time they are run, “No faults detected” still does not mean “All is Well” but at least there are no detected GROSS problems. Unless they can find a fault, they will return your computer unchanged.


Genius Bar technicians are NOT trained to read panic reports and computer logs. When you present your computer at the Genius Bar with the expectation of a quote to repair it, you must generally meet these criteria:


• your Mac won't do anything

• your Mac fails diagnostics

• your Mac has a problem you can repeatably demonstrate on demand


one other oddball case:

• Apple online support has DIRECTED a Service Provider to replace specific components inside your Mac, such as the mainboard or display. Bring proof, such as case number.


The telephone support people are more likely to work with you. They will insist that you go through the motions to eliminate software issues. But when they get to the end of their list, you should insist on having your problem escalated to a specialist. Specialists are more likely to actually read your panic reports, and to agree this is a problem and DIRECT an Apple service provider to swap things (likely mainboard) for a new one.


You MUST have a Trusted backup before submitting your Mac for service. if the mainboard is swapped out, the boot drive will be swapped out as well, and you will not get your files back.

Feb 9, 2025 12:00 PM in response to AUH1010

AUH1010 wrote:

Im running 4 Displays - 3 via USB-C & 1 Via HDMI

3 x Razer Raptors 27"
1 x ROG Strix XG349C
1 x External Hard drive -With all my apps downloaded

I mainly have chrome open and figma

And, what happens after you disconnect all of those? I would leave one display connected via HDMI to test.

If you don't get panics with only that, try adding things and see what happens.


There is nothing that can be found in the panic log that will magically solve the problem. You have to use the process of elimination to figure out what it is. If you remove everything and still have panics, then it is likely internal hardware fault and you need to take it to a Genius Bar or Authorized Repair Center.

Apple Repair and Repair Status Check - Official Apple Support


Feb 9, 2025 10:29 AM in response to AUH1010

The kernel panic message you're seeing indicates a PAC (Pointer Authentication Code) failure involving the DA key (Data Address key). This is a security feature in Apple Silicon processors.


Some potential reasons could be:

  • A macOS kernel or driver issue (especially if you recently updated to a new version).
  • If you use software that installs kernel extensions (like virtualization tools, security software, or hardware drivers), a faulty extension could cause this. You can check to see what third-party kexts are present with this command in the Terminal app: kextstat | grep -v com.apple
  • Since the EtreCheck report indicated that this happened 3x in the last 5 days, it could indicate bad RAM or another hardware fault in the M-series chip.
  • Finally, if macOS files got corrupted due to improper shutdowns or disk issues, you could see this type of kernel panic.


If this was a one-time kernel panic, it might not be a major issue. However, since it’s recurring, I’d suspect either:

  • Faulty RAM or logic board (since RAM in M-series chips is integrated).
  • A macOS bug or software conflict.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Mac Studio - Regular Panic

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