CPU Panic

[Henk L]

I have frequently CPU-panic messages on my iMac 19,1 (6 core Intel Core I5) with two memory-banks filled with 16GB (Hynix). I am using a QNAP-NAS without any problem. I still have guarantee for a couple of months from the shop where I bought the iMac secondhand. I tested my memory with Rember and that seems to be allright. I don't know what causes it but I am becoming in some state of 'PANIC' about this. It happens once a week and I am not using the iMac under great stress. Can somebody give me a clou how to manage this problem. I would be very grateful for that.
For instance the last panic-message of this night (the first essential lines I think):
panic(cpu 5 caller 0xffffff80141d0d53): Kernel trap at 0xffffff801464e16b, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x0000000000000118, CR3: 0x000000018a8471f5, CR4: 0x00000000003626e0
RAX: 0xffffff8014ef0d60, RBX: 0xffffff90997f3d18, RCX: 0xffffff70c8d68310, RDX: 0xffffff8565b2cb40
RSP: 0xffffffeb2a0cbef0, RBP: 0xffffffeb2a0cbf40, RSI: 0xffffff9560902d10, RDI: 0xffffff90a5156aa0
R8: 0xffffff80141c5390, R9: 0xffffff8014e73ffc, R10: 0xffffff809971bb70, R11: 0x0000000000005000
R12: 0x0000000000000000, R13: 0xffffff9094d04e80, R14: 0x00000000000000b0, R15: 0x0000000000000000
RFL: 0x0000000000010207, RIP: 0xffffff801464e16b, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x0000000000000118, Error code: 0x0000000000000000, Fault CPU: 0x5, PL: 0, VF: 0

Panicked task 0xffffff95609096a0: 1 threads: pid 56715: bash
Backtrace (CPU 5), panicked thread: 0xffffff90997f3540, Frame : Return Address

 

[rpmurray]

You only ran one test with Rember which is not enough to really test the RAM. Also, those lines from the panic log are meaningless. What you should do is zip the whole panic log and attach it to a reply here.

If you run the System Report in About This Mac, what does it report about the RAM (Memory under Hardware)? Is the RAM the original Apple RAM or third-party? If third-party have you tried putting the original back in to see if the same problem occurs?

One thing you might try doing is running Etrecheck and see if it points out any issues.

Edit: What version of macOS are you on?

Edit 2: Two other things I also often see recommended are:

1. Reboot into safe mode and see if it happens there.
2. Create a new user account and see if it happens there.

In both cases you're trying to have the iMac running the minimum number of applications, menu bar apps, extensions and background processes. If it happens with the system pared down then it's likely a hardware error. If not then it must be some software that's been installed. Rebooting into Safe Mode also clears the system caches, so that would clear up any corrupted data there that may cause this.

Was the OS installed clean or did you update from a previous version? Sometimes background helper apps, launch daemons, or extensions from a previous OS aren't completely compatible with the new OS. Etrechcck should be able to help you narrow down any possible culprits.

Another option is to boot the iMac into Diagnostic Mode to do a check of the hardware.

 

[kibepo73]

The most likely cause for a Kernel Panic issue occurring in MacOS is faulty software, damaged or incompatible hardware, including external drives attached to the Mac. To fix the issue, try the below steps:

1. Restart your Mac in Safe Mode and check for updates.
2. Uninstall any plug-ins or 3rd party software from manufacturers other than Apple.
3. Disconnect all connected devices.
4. Use Apple diagnostics to diagnose the problem.

Further, you can check the below link:

https://support.apple.com/en-in/guide/mac-help/mchlp2890/mac

Hope it helps!