How to diagnose a panic report - How do I fix this?

Question

How to diagnose a panic report - How do I fix this?

How do I fix this?

(note: I have included the invisible .panic files located in Library/Logs/Diagnostic reports in the 'additional text' box)

My brand new 16" M1max Macbook Pro just abruptly shut down with this error:

"panic(cpu 0 caller 0xfffffe001dd09cac): DCPEXT0 PANIC - IOMFB int_handler_gated: failure: axi_rd_err [0x40310600]

- iomfb_driver(7)

IOMFB int_handler_gated: failure: axi_rd_err [0x40310600]

RTKit: RTKit-1827.120.2.debug - Client: local-t600xdcp.release

!UUID: 9f30093b-2eba-3d7f-b479-e2492ac7c6e0

Time: 0x000005d54fa8face

Faulting task 7 Call Stack: 0x000000000001d94c 0x000000000001d45c 0x000000000001d318 0x00000000000203e8 0x0000000000192580 0x000000000013cd4c 0x0000000000191aa4 0x00000000000dd0cc 0x000000000001dde0 0x0000000000011230 000000000000000000"

Invisible log files

MacBook Pro 16″, macOS 12.6

Posted on Sep 27, 2022 9:18 PM

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Answer 1

Best reply

HWTech

Level 9

56,090 points

Sep 28, 2022 12:34 PM in response to MrVaderSIX6six

Unfortunately it seems many of these newer Kernel Panic logs are in a much different format providing very different information than earlier versions of macOS had plus having terrible formatting. Seems Apple is even making the Kernel Panic logs a waste for troubleshooting (why Apple?). The only thing I can gleam from it is the last started driver was "com.apple.driver.AppleUSBMergeNub" which has something to do with USB. Plus there is this at the beginning of the log which also suggests an I/O issue "DCPEXT0 PANIC - IOMFB".

Did you connect or disconnect, or even use a USB device at the time of the crash? Try disconnecting all external devices in case one of them is causing the problem. @P. Phillips' suggestion for an EtreCheck is a good one in case the problem is being caused by third party software.

You can also try running the Apple Diagnostics to see if any hardware issues are detected. Only a failing diagnostic is really useful.

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Answer 2

Sep 28, 2022 12:50 AM in response to MrVaderSIX6six

These panic reports may be useful to Apple engineers, but for us mortals they are pretty much inscrutable.

In order for us, users like yourself, to be able to help: Please run Etrecheck and post its full report here. Use the "additional text" button and paste the report into the text box.

The report will tell us about your mac model, drive, ram, and most importantly third party system modifications which could affect performance and cause crashes. With that information, hopefully we can get closer to the answer you seek.

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Answer 3

PRP_53

Level 10

85,465 points

Sep 28, 2022 2:46 AM in response to MrVaderSIX6six

Very much agree with @Luis S above statement.

Computers, generally, Panic because of either Hardware Issues and or Bad Kernel Extension installed and used on the computer.

Much of which may be revealed as per suggested -->> Download the Application Etrecheck directly from the Developer.

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Answer 4

Oct 11, 2022 5:43 PM in response to HWTech

I ran diagnostics and returned no issues.

I assume this has something to do with my multiple screens and other peripherals being run on a USB dock. After I cleared it and disconnected everything, she seems to be running just fine now. Unsure what the exact issue was but I think restarting with nothing connected. Still no idea what the exact issue was or which peripheral was/is the problem, guess we will see if it gets hit again haha.

Thank you all for your help!

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How to diagnose a panic report - How do I fix this?

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