Level 1

73 points

"BAD MAGIC! (flag set in iBoot panic header)" — Catalina freezing all the time!

I formatted my Mac and reinstalled macOS, the solution I was hoping to frequent freezing (after about 30 minutes of normal use). To my terrible surprise, my Mac still froze. A hard shutdown and restart and here I am.

The log says this: "BAD MAGIC! (flag set in iBoot panic header), no macOS panic log available"

I'm at a loss. I haven't installed any software and it froze. A quick hardware diagnostics didn't find anything wrong with my hardware. This is a new 2018 MacBook Pro. It was working great until Catalina.

This is terrible. I place myself in the helpful hands of the internet in the hopes of solving this.

MacBook Pro 15”, macOS 10.15

Posted on Nov 5, 2019 6:04 PM

Top-ranking reply

m4de

Level 1

12 points

Posted on Jan 12, 2020 9:51 AM

This question has already been answered in the thread, this bug has no regional limit.

What defines this kernel panic :

Recent hardware with T2 chip on MacOs Catalina (starts late 2018, includes new MBP16 & new MacPros) Some reported the same bug with a different name on HighSierra
Common triggers : sleep-wake mode + external devices connected (any device, from hub, to screens and hard drives)
Some have short burst of high temperature + maxxed fans + global freeze, right before sudden reboot
Non working fixes : Flashing T2 firmware / Changing unit or motherboard
Short lived fixes : SMC + PRAM reset / T2 security disabled / HD encrypting disabled
More solid fixes : Disable all HD & Screen sleep (energy saver panel) / Screen sleep via shortcut or hot corners works / Disconnect all external devices if you don't disable the energy saver mode while away
Note : passes the Apple Service hardware tests but is easy to reproduce once you are plagued with it and know how to trigger it

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414 replies

Apr 25, 2020 8:07 PM in response to mbguercio

I have the exact issue with my 16 inch macbook pro with external eGPU connected to 3 Non 4K dell monitors.

My mac reboots after I stop the GPU, disconnect it and leave the Macbook in sleep mode . When I get back and open the lid it says the system was restarted due to an issue "BAD MAGIC! (flag set in iBoot panic header),"

I have the spec'd out

MacBook Pro (16-inch, 2019)

2.4 GHz 8-Core Intel Core i9

64 GB 2667 MHz DDR4

AMD Radeon Pro 5500M 4 GB

Intel UHD Graphics 630 1536 MB

My three Dell monitors one 4K and other two being non 4K are connected via thunderbolt to a

Radeon RX 580 8 GB graphics eGPU on Razer Core X Box

I have no freaking clue what to do ? It seems to be fine if I leave the laptop running for the entire day it only happens if the mac goes to sleep

pedro-ale Author

Level 1

73 points

Jun 16, 2020 9:00 AM in response to pedro-ale

8 months since I posted this and still no answers. This is pretty much all I've learned since then:

It seems less likely to happen if you don't shut down or restart your computer. The longer it stays on and off from sleep, the less it happens.

That's it.

With over 900+ people also having this problem, I'm surprised Apple hasn't at least openly admitted that there's a problem.

Nov 27, 2019 4:28 AM in response to mbguercio

I'm having this as well. Super annoying...

Dec 4, 2019 9:27 AM in response to pedro-ale

Why is this even called "BAD MAGIC!", but in all seriousness this is, probably, a T2 crash

Jan 14, 2020 9:24 AM in response to tekshrek

I returned my 16”. Not comfortable with a brand new machine crashing randomly when my 2013 model is still running fine. I will only buy again when Apple has acknowledged and fixed the issue.

xlphed

Level 1

4 points

Mar 2, 2020 6:14 AM in response to xlphed

Tried using chrome instead of safari, used to crash once or twice a day but so far it's been 2days and no crashes observed. Fingers crossed. You guys might wanna try it out.

Mar 8, 2020 2:41 PM in response to Jon Hill

My customer indicated they didn't get the crash notification (and I didn't see one either) until I removed their LG Ultrafine and replaced it with a LG 27UL800.

Mar 25, 2020 7:50 AM in response to JonMitten

How is this even a thing. 🍎🐛

Mar 25, 2020 10:28 PM in response to Nat_c

You can move your mouse with your head in 10.15.4 now tho how do you like that.

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"BAD MAGIC! (flag set in iBoot panic header)" — Catalina freezing all the time!