Kernel Panic on 16" i9 MBPwRD

@SidGP, headkit: That’s a very helpful datapoint — thanks much! Similarly, I found that I could reliably reproduce this bug by repairing my iCloud-synced photo library, which re-sync’s every photo with iCloud servers. I’m not sure if other iCloud services cause the same crash (e.g. iCloud Drive), but I suspected the cause was a sync service that runs during power nap; most like;y one that utilizes a GPU...

I suspect much of this work is done by BridgeOS on the T2 chip during power nap (vs. a macOS background process) to minimize power consumption, but there’s very little public info on BridgeOS, so I could be totally off base... Also, IIRC, the only iMac with the T2 chip is the iMac Pro, so perhaps the root cause is just another bug in iCloud photos sync. I hit a horrific iCloud photo sync bug in either the first Catalina release or iOS 13, which resulted in me permanently losing >1k photos (of ~13k) on all of my devices on 10/12/19. My RTAs related to this incident are still open, and as of 10.15.4, a clean sync from iCloud still results in corrupt image metadata for another ~3k photos... But I digress.

I haven’t had a chance to confirm 10.15.5 fixes this bug myself, but others have reported success with versions >= beta 4 (though I personally recommend waiting for the GM release if possible)... Anyway, thanks for your input and kind words — most of the progress I’ve made researching this issue is thanks to the many users who provided invaluable information in this thread — you guys deserve most of the credit!

The answers in your link is very wrong. I have disabled powernap (under battery and connected to power). I still get this crash a few times every week. I have NO hardware attached to my MacBook Pro retina from 2015.

I have a cal digit hook up and an external monitor attached to it. I had this same issue. I called the apple specialist first. We did a SMC and NVRAm reset. It didn't help.

What I did was...

Sys preferences - energy saver - CHECK prevent computer from sleeping automatically when the display is off - UNCHECK put hard disks to sleep when possible.

Haven't had an issue since. Hope this helps!

D’oh, thanks @Wally5280! Could you post the latest kernel panic here at your convenience?

Just got my 16” MBP back from the service center last night, and started loading ~400 gigs of photos from iCloud with power nap enabled this morning. I’ll post back with an update ASAP as well.

Side note: Photos metadata is now missing for all of my non-iPhone photos. I reported sporadic issues w/ metadata in October and have an RTA still pending bug fix, but I found it odd that this issue has multiplied...

I just noticed this tag was added to my FBA case, but not sure how long it's been there:

Resolution: Potential fix identified - For a future OS update

Still no reply from Apple; submitted another user's panic log from 10.15.5 in FBA case, but not sure if Apple thought this was actually fixed in 10.15.5 or not.

My MacBook Pro i9 32gb 5500M 4GB running 10.15.5 Catalina is crashing every single time I send it to sleep mode. Both power nap options are off.

After it restarts - it will always crash right after showing the login screen and this will repeat 3 to 5 times. After this it will continue to work as nothing happened until I chose the lid or use sleep mode. While going through that reboot loop the surface over the touch panel will get extremely hot.

Sent it back to the store to check.

My MBP 16 with 32G started crashing after upgrading to 10.15.5 a week ago. It had been working fine for months on 10.15.3 or 10.15.2 I believe. Resting SMS and Turning off power NAP didn't help.

The only workaround works for me now is keeping the lid open and turning mirrored display brightness to zero. I have an external monitor connected via USB-C->DVI, so I had kept lid closed before this issue.

OK.... MacbookPro 16 (from march/april): Friday my macbook updated from 10.15.4 to 10.15.5 (19F96). That reintroduced the Sleep-Nap-Kernel-Panic (Kernel Panic when sleeping and on power). The disable "Power Nap" trick solved the problem in the weekend.

Then this morning (in EU), my computer did a huge update again. 15 minutes. Did not ask questions (none). Bum... New version of 10.15.5 was installed: Going from build 10.15.5 (19F96) to 10.15.5 (19F101).

2020-06-02 09:56:35+02 CaspersMBP16 softwareupdated[366]: softwareupdated: Starting with build 10.15.5 (19F101)

2020-06-02 09:56:50+02 CaspersMBP16 softwareupdated[366]: Previous System Version : 10.15.5 (19F96), Current System Version : 10.15.5 (19F101).

Talking about panic.. Apple releases a brand new 10.15.5 build three days after the previous one.

Lets hope that 10.15.5 (19F101) solves the problems, because 10.15.5 (19F96) did not!!!

I bought my MBP 16" on May 6 with Catalina 10.15.3.

I experienced a lot of KP when it goes to sleep (with or without external monitor).

After update to 10.15.4, I experienced KPs each 5 days, normally during the late night.

After update to 10.15.5 (19F96), just lock my computer and wait for the screen gets off with an external monitor connected causes a KP.

I just updated to 10.15.5 19F101 and seems that it does not happen anymore.

Let's see in a long term if the recurrent KP problems with a brand new MBP 16" finally gets resolved.

No, the Catalina 10.15.5 19F101 not resolved the problem. Just get another KP:

panic(cpu 10 caller 0xffffff7f88fa1ad5): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds

I have an open case ticket on apple's support. I'm looking forward to get apple's position about it.

Hi. Thought I'd share here too, there are a few similar threads. I've been experiencing the kernal panic from sleep issue from 10.15.4 onward on my 16" MBP bought in February. Was onto apple support with no solution found (tried all the resets, clean reinstallations, eliminating external monitors, 3rd party software etc).

Then found the disable powernap "solution" with 10.15.4, which worked just fine.

Made the mistake of upgrading to 10.15.5 and the problem got worse, kp'ing from sleep every single time.

Today I installed the supplementary update (I keep hoping they'll solve the issue) and now it sleeps and wakes fine, so long as it isn't plugged into my external monitor (Dell U2715H). When plugged into the monitor it KPs during sleep every time, though the time it takes to KP varies (I hear it whoosh).

Have tried resetting the SMC again, switching off various power save options, none making any difference right now. I guess it's just a case of waiting for more updates to solve this.

Just got a response from opened apple support ticket: We know about this problem with MBP 16" and you should wait for the next Catalina update in order to check if the KP problems stopped.

I really like apple products and I'm also a heavy user (macbook, iphone, airpods, etc), but this kind of thing is really frustrating and i'm very sad with that situation :(

Thanks all for sharing with the community. I've been having this issue for a long time with my 16" MBP and applecare has been awful. I sent the machine in, they claimed they couldn't reproduce, sent it back, spent hours on the phone with them and finally they agreed to escalate the ticket to a product engineer. A few days later, they came back saying "PE thinks it's a hardware defect, please ship to us again to replace logic board." At this point I have 0 confidence AC knows how to fix, even after escalating to a leadership level contact I have from friends there. The good news is, it sounds like this might be fixed in an upcoming software update, let's keep our fingers crossed for 10.15.6. I can confirm, like others, that 10.15.5 + Supplemental Update have not addressed it.

I've had my 16" since march-ish but didn't expereince these problems before updating to 15.5, now I randomly get stuck in boot loops and crashes from sleep. I like the machine but this level of unreliability is unacceptable.

Well, add me to the list. Brand new $4,500 MacBook Pro 16” and after 2.5 months it has thunderbolt kernel panics and won’t stay started up for more than 45 seconds before ... poof goes the fans and screen black. Took it to Apple on Fathers Day, great way to spend that day, to have it gone to this day (3/Jul/2020). My support ticket at My Support always returns an error...no details...and. Allying the Apple Store where I left it is useless...they know nothing, and say the technicians are waiting on a part. What part? What’s wrong with it?

back to using my 2011 MacBook Pro 13” which is a rock. Never again will I purchase an Apple MacBook with this miserable experience hanging over me. Complete customer build gone in for repairs a few months in, and the computer hasn’t ever left my desk! It mostly played Apple Music during work#from-home (cough, on a Windows machine, cough), and processed some photos.

completely ****** off