Panic Crash

I put my iMac Pro in sleep mode last night (this is my typical end-of-day routine). I came in this morning to my startup screen. Once it booted into my user account, I found a crash report. The top line reads:


Panic(CPU 0, time 720469129135130): NMIPI for unresponsive processor: TLB flush timeout, TLB state:0x0


RAX: 0x0000000000003058, RBX: 0xffffff8b74918000, RCX: 0x0000000000020000, RDX: 0x0000000000020000

iMac Pro (2017)

Posted on Sep 16, 2023 8:53 AM

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Question marked as Best answer
Yes. I understand. Operative word: “probably.” We’re talking about a crash that’s happened once, so testing the problem (by disconnecting devices) may not reveal anything.

Yes, that's why I asked how often they occur. Once isn't suitable for troubleshooting and it could just be a one-off.

Posted on Sep 17, 2023 1:17 PM

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Question marked as Helpful

Sep 17, 2023 12:12 PM in response to KID-A

My initial concern was that it might be a computer (iMac Pro) issue, so it’s a relief to learn that it’s probably connected to a peripheral device (pun intended). Thanks for responding. I appreciate your expertise.

That’s not what I said. You need to disconnect them and test. If the panics cease, it was one of them. If they continue, it is likely internal.

16 replies

Sep 16, 2023 9:17 AM in response to KID-A

KID-A wrote:

I put my iMac Pro in sleep mode last night (this is my typical end-of-day routine). I came in this morning to my startup screen. Once it booted into my user account, I found a crash report. The top line reads:

Panic(CPU 0, time 720469129135130): NMIPI for unresponsive processor: TLB flush timeout, TLB state:0x0

RAX: 0x0000000000003058, RBX: 0xffffff8b74918000, RCX: 0x0000000000020000, RDX: 0x0000000000020000



Uninstall all third party apps that are Cleaners/Optimizers/Anti-Virus/VPN

all known to cause issues on the macOS


To trouble shoot further you can:


—A SafeBoot Use safe mode on your Mac - Apple Support will sort many anomalies


Does a quick disk repair before it fully boots up, and certain system caches get cleared and rebuilt, third party system modifications and system accelerations are disabled.

Login and test. Reboot as normal and test. Caches get rebuilt automatically.


This test will tell you if third party interference; most* extensions etc are not loaded in safe boot mode.



—Test issue in another user (or guest user) account Change Users & Groups settings on Mac - Apple Support

This will tell you if it a universal issue or isolated to your user/admin account. 



Learn what to do if your computer restarts or shuts down unexpectedly, or you get a message that your computer restarted or shut down because of a problem.




If your Mac spontaneously restarts or displays a ... - Apple Support

If your Mac restarted because of a problem - Apple Support


Sep 16, 2023 9:56 AM in response to leroydouglas

Thanks leroydouglas.

  • Antivirus: I have no antivirus software on my computer.
  • Optimizer: I don’t know what an “optimizer” is so I doubt I have that either.
  • VPN: None that I’m aware of. I’m connected to my work team through my employer’s Slack and Google Drive accounts. I’m not sure if either of those apps utilize a VPN, but it’d be moot because I can’t effectively work without them.

I will try rebooting in safe mode … again, thanks.

Sep 16, 2023 10:05 AM in response to KID-A

KID-A wrote:

Thanks leroydouglas.

Optimizer• : I don’t know what an “optimizer” is so I doubt I have that either.
VPN• : None that I’m aware of. I’m connected to my work team through my employer’s Slack and Google Drive accounts. I’m not sure if either of those apps utilize a VPN, but it’d be moot because I can’t effectively work without them.


Optimizers are like MacKeeper, CleanMyMac, etc. The are bad, bad, bad.


Employer's, banks or schools VPNs are OK. But you want to avoid public VPNs as they are not private as one would be led to believe.


Do try the Safe Mode boot and see if the problem persists. Then reboot normally and check again.




Sep 16, 2023 12:13 PM in response to Barney-15E

No, this does not happen often – in fact, this was the first time. What does happen often: I frequently have “disc not ejected properly” errors messages at wakeup. They appear in floating boxes in the top-right corner of my screen. Sometimes, there is one error message. Sometimes, there are eight or ten.


Hardware connected to my computer:

  • A hard drive shoe that holds a 2TB “internal” hard drive, that I use as a Time Machine backup.
  • A USB multiport that allows me to connect devices without having to access the back of my iMac. It’s always plugged into the back of my iMac, but I never put my computer to sleep with devices connected to it.
  • An Epson WP-4530 inkjet printer.
  • A Lacie external hard drive that I keep some files on.

That’s it.

Sep 16, 2023 6:34 PM in response to KID-A

What does• happen often: I frequently have “disc not ejected properly” errors messages at wakeup. They appear in floating boxes in the top-right corner of my screen. Sometimes, there is one error message. Sometimes, there are eight or ten.

Set your Mac to not put hard drives to sleep. It will also be faster with open/save dialogs.

Hardware connected to my computer:
A hard drive shoe

Hmm.

• A USB multiport that allows me to connect devices without having to access the back of my iMac. It’s always plugged into the back of my iMac, but I never put my computer to sleep with devices connected to it.

Probably not a problem, but some hubs are garbage.

• An Epson WP-4530 inkjet printer.

Likely not.

• A Lacie external hard drive that I keep some files on.

Possible, but rare.

Sep 17, 2023 8:29 AM in response to Barney-15E

Thanks Barney-15E. Responses (to your responses):

  • My hard drive is already configured not to sleep.
  • I don’t know how to read “hmm.” I ordered a new external hard drive to replace the shoe setup for Time Machine backups as it seems like a possible cause.
  • Regarding my USB hub, I swear I bought one that promised to be “not garbage.” :–)

Thanks again.

Sep 17, 2023 9:51 AM in response to KID-A

None of us can fix a panic. We can offer ways to figure out what might be causing it. You will have to do the actual troubleshooting.

Of the probably causes, you are left with hardware. Could be internal or could be external. You can try disconnecting devices and see what happens. Or, just take your Mac into an Apple Store Genius Bar or Authorized Repair Center and have the internal hardware checked.

Question marked as Helpful

Sep 17, 2023 12:12 PM in response to KID-A

My initial concern was that it might be a computer (iMac Pro) issue, so it’s a relief to learn that it’s probably connected to a peripheral device (pun intended). Thanks for responding. I appreciate your expertise.

That’s not what I said. You need to disconnect them and test. If the panics cease, it was one of them. If they continue, it is likely internal.

Sep 17, 2023 12:47 PM in response to Barney-15E

Yes. I understand. Operative word: “probably.” We’re talking about a crash that’s happened once, so testing the problem (by disconnecting devices) may not reveal anything.


For now, I’m eliminating the nuclear option (hardware failure with my two-year old iMac Pro). That doesn’t mean it won’t happen: if disconnecting / replacing peripherals doesn’t solve the problem, then it probably is an internal hardware issue. I don’t want to think about that until I have to.

Panic Crash

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