Kernel Panic on 16" i9 MBPwRD

It just happened on my new 3 day old MacBook Pro 16" i9 (64GB RAM, 8GB GPU, 2.4GHz), I updated to Catalina 10.15.4 yesterday and today in the evening I put the macbook to sleep, 1 hour later it had an unexpected reboot. The macbook is connected and charged through usb-c from Dell U2720Q. I didn't change any power related settings, other than enabling always-on USB-C charging on the Dell monitor. I submitted my crash data - FB7676439.

Quick update re: FeedbackAssistant case w/ Apple. I was finally able to reproduce this crash on my machine again, and have sent a complete sysdiagnose to Apple (with 4 profiles installed). So we probably don't need to collect/send more sysdiagnose reports after hitting this crash until Apple engineers reply. That said, if you want to send one to Apple, I'm still happy to relay the FBA#.

I also wanted to thank everybody here who posted their experience, tips and tricks! Because of this information, I was able to build a solid theory and I can now reproduce this bug more reliably. The trick was not just to enable power nap, but to also queue up a *lot* of work to be done while the computer is asleep with Power Nap enabled. Please note that I've hit this kernel panic even with power nap disabled, but it happens less frequently.

My first attempt failed (adding ~ 1 gig of RAW photos on my MBP and shooting ~50 photos from my iPhone). For some unknown reason, my MBP wouldn't upload or download any changes while asleep (despite having power nap enabled for both battery and wall power). It would only sync while Photos.app was open and the computer was awake.

My second attempt was to repair my Photos.app libarary, which causes resync'ing of all ~13k photos (~350gigs). After the initial repair phases (and getting back to the grid view), I closed the lid and came back 3 hours later to a warm laptop. I opened it up, and the screen was blank and the T2-controlled Touch Bar was in a very odd state. After ~5 minutes of closing/opening the lid and switching between battery and wall power, the login screen finally appeared, and then the usual crash reporter window popped up. Thankfully I decided to film my laptop during the wake-up phase, which I included in my FBA case.

Anyway, I'll be sure to keep this forum updated with any new information as soon as it becomes available!

Very interesting!!

I simply can't provoke reboots and CPU / GPU Panics again. I have enabled power nap again (for 12 days now) but am getting no restarts at sleep. Have all kinds of software installed. Also things that should sync at sleep, but may not have pushed the system as hard as you. But mysterious that it rebooted as a clean install with no additional software, and now doesn't do it with 70 programs installed, including google drives etc. I will try your approach with repair Photo.app library to provoke intensive workload at sleep.

Thank you for a good and thorough reporting.

You definitely need to have a lot of items in the queue to be synced (downloaded or uploaded). The crash happened in my case because I bought a new macbook and it was downloading 70GB of pictures in sleep and this caused it to crash after about a hour. Regular small syncs will probably not trigger the bug.

Is there a way to remove the "Solved" tag? It certainly isn't solved yet.

Experiencing the same issues. Thought it was my USB Hub, since it seemed to crash only when it was plugged in. But no, at least it wasn't just that. Mind you I also have my time machine back up drive plugged into the hub, and that would've been one of those things that cues up during power nap.

Hope Apple can get this fixed (and the screen color changing after some wakes).

Mine just crashed again, after running for almost a week with App Nap completely disabled.

I wasn't doing anything resource intensive, the only apps open were Zoom, Firefox, Google Chat, Whatsapp, Fantastical and Mail.

Used "Feedback Assistant" to submit to Apple, and linked this thread in the description. My feedback ID: FB7677896

Crash on "wake from sleep". Basically I opened the lid, keyboard lit up but screen unresponsive. About 10 seconds later the reboot cycle occurred.

Same as everyone else - I posted the kernel panic logs earlier.

Did you see my post last night, containing the feedback ID: FB7677896

Posting our logs here is also a useful way of confirming that we're all experiencing the same issue, and that it's not related to our specific software setup or perhaps a hardware fault - this is a general problem with MacOS.

You can use the Feedback Assistant app on your MacBook, it will also automatically capture and include the system logs. And you will get notifications if there is any reply or update. I also noticed that now my report has this field:

Recent Similar Reports: More than 10

(it was 0 yesterday when I reported the issue).

@Thimme: Thanks, added your FB# to the list!

@Jensche21: Just to clarify, I believe that kernel panic log was just the CrashReporter output, which is *generally* safe to post, and the best way to confirm we’re hitting the same bug. But still good advice not to post system logs without redacting personal info. please note that I asked others who encounter the same bug to collect a sysdiagnose, upload it to a new FBA case, and post the FB# here so I can add it to the list. This is just my personal attempt to help expedite the triage/reproduce/fix/release process. Apologies for any added noise from this thread. Hopefully engineering will get back to us soon w/ an update, but I have no idea what the turn around time is.

@jwesley07: No problem! I’ve written my fair share of software bugs over my career, so it’s the least I can do! :)

I have had this issue since I purchased the 16" MacBook Pro back in Feb. but only now getting around to finding a resolution. I see that this issue was first reported back in Dec. 2019. I will open a support call as well and see if I can get an update on when the fix will be delivered.

For now, I will try disabling the Power Nap option and reset SMC and NVRAM and let that run for while to see if I still see daily crashes. I do not have any USB devices connected besides the power cable.

Sleep transition timed out after 180 seconds while notifying clients about upcoming system capability changes. Suspected bundle: com.apple.iokit.IOGraphicsFamily. 

MacBook Pro 16" 2019

2.6 GHz 6-Core Intel Core i7

16 GB 2667 MHz DDR4

Intel UHD Graphics 630 1536 MB

Catalina 10.15.4

Hi, just wanted to say thanks for looking at this so deeply and for all the effort you must have put in on issue raising etc. I'm on an almost brand new macbook pro 16 inch max spec and it just started making it so that every time I came back to my computer I was greeted with the message about not shutting down properly. Reading your helpful insight into the matter has saved me from the pain and misery of talking to apple who will no doubt deny that this is even a thing which has happened to anyone (just like they did with the dodgy butterfly keyboards). Thanks again and hope you have a top day!

I would like to point out, too, that after a number of kernel panics and restarts, I booted up to the repair partition and ran Disk Utility. Sure enough there were problems that needed repair. I don't know if this just happened to be needed, but it may be good to double-check this on your own Mac.

I spoke again yesterday with a higher employee of Apple, not Tech Supervisor Level 2, who looked at the status of this powernap problem. Looks like Apple is aware of this problem, they are working on it. Could possibly come with the next update.

Regarding prioritization he said. You should report the case via phone/chat. And not via feedback form.

Since this logically causes more work, i.e. more costs in the end. This means that the problem is also prioritized higher. Because Apple wants to keep the costs for support as low as possible.

I hope we see an update soon.