Big Sur kernel panic

Recently i upgraded to Big Sur and i leave the computer for some time and came back and see that the system was rebooted with kernel panic. any help would be appreciated to fix the issue.


Here is the log i get when the imac pro is started


panic(cpu 4 caller 0xffffff800e153a13): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds


iMac Pro

Posted on Nov 14, 2020 6:42 AM

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Posted on Jan 19, 2021 11:23 AM

AdGuard knows there is an issue but they claim they can't fix it from their side… yet the problem goes away when you uninstall their software:


https://github.com/AdguardTeam/AdguardForMac/issues/761


AdGuard was suspect because its extension was clearly mentioned in the backtrace:


Kernel Extensions in backtrace:
         com.adguard.nfext(27.0)[4AF16C66-CBFC-369B-8F0A-6FB96F1D536E]@0xffffff7fb1185000->0xffffff7fb1188fff



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166 replies

Nov 28, 2020 2:57 AM in response to gyang101

As you may have seen, same situation as you however it doesn't involve Parallels. I have Parallels but rarely use it.


And the battery trick? Doesn't work. I did change the settings in battery and things went smoothly for a few days but I had another kernel panic yesterday.


I suppose keep reporting these panics to Apple. The opportunity to do so happens when you reboot your computer. Enough people report it and the better the chances are this will be fixed in a future software patch.

Dec 3, 2020 8:21 PM in response to rbmanian75

This may be just a continuation of kernel panics in previous MacOS versions. I've been having them in Catalina since day 1. If you Google kernal panics in MacOS you'll see reports suggesting a memory leak is responsible. I've delayed upgrding to Big Sur hoping to hear the problem has been resolved. In my case, the system waits until I shut down after running all day, or sometimes after running for a couple of hours. Then instead of shutting down nicely, it spend a long time on a darkened (but not black) screen and then restarts saying it restarted because of "a problem." I've sent dozens of these dumps to Apple. iMac late 2015, 8GB memory.

Dec 10, 2020 7:43 AM in response to NJ Ron

NJ Ron, I updated my post to say I had the same problem after I switched to Chrome. I ran Chrome for several weeks, but since I was still getting kernel panics, I went back to Firefox. Agree it's in system, but maybe related to something that happens during Web surfing or idle time system processing when Web apps and their residue remain in CPU and machine memory or operational cache.

Dec 22, 2020 7:44 AM in response to NJ Ron

16-inch MacBook Pro shipped to me from China a couple of months ago with Catalina installed. It has 2.4 GHz 8-Core Intel Core i9, 32 GB of memory, and 2 TB SSD. I had zero kernel panics in Catalina. I had somewhere between 5 and 10 on Big Sur, but I have had zero since updating to 11.1. My previous MacBook Pro was overheating because its battery was failing, but the symptom was not a kernel panic but rather slowness induced by kernel_task. My two hubs were apparently drawing too much power on this machine, but the symptom was shutting down some of the ports, including my backup drives, and the solution was to consolidate everything on one hub. That hub uses up two of the MacBook Pro's four ports. The small number of ports is a negative feature. My CD player uses one; it won't run from a hub. Also, the ports are too close together to plug USB adapters into two adjacent ports. All that makes a hub essential. I have my external monitor, two backup drives on a chained hub with its own power supply, Ethernet, and a few more things plugged into the first hub. I could plug the power cord into the hub. but it seems to work better if I plug it directly into the MacBook port. I wish I had known that Apple's new CPU (much faster and lower energy usage) was coming (though not yet on the 16-inch).

Jan 13, 2021 8:05 AM in response to Alexandros80

I had some USB issues in Catalina with my new 16-inch MacBook Pro, but they did not cause kernel panics. They only disabled the ports. On the other hand, I had many kernel panics beginning with the update to Big Sur 11.01 and none since the update to Big Sur 11.1. In my case, at least, the kernel panics were clearly caused by Big Sur 11.01. As I posted previously somewhere, there can be multiple causes of kernel panics. If yours did not begin with 11.01 and end with 11.1, then I'm sure they have a different cause than mine.

Jan 14, 2021 3:16 AM in response to rbmanian75

Just to chime in: I have a late 2015 iMac which does more or less daily kernel panics. Often with watchdogd as current thread, but not necessarily. Happens most often when video conferencing (Skype, Teams) but I've also seen it happen while I was out to lunch.


This started with Catalina, I think. But there were no KP reboots there, just total lock-ups. Since Big Sur I had sudden reboots with KP reports, and now (since 11.1?) it dies slowly: all kinds of apps stop responding one by one over like a few minutes and only then it restarts.


Tried all sorts of stuff (disconnecting devices, re-install, clean install from internet, reset NVRAM/PRAM, call Apple), all to no avail so far. I even disabled half of the RAM as I suspected that.


I downloaded DriveDX (free version) and it reports all fine on the Fusion Drive.


Jan 19, 2021 7:10 AM in response to rbmanian75

Time to post - I've been working w/Apple for several weeks re panic attacks seemingly related to Photos. The problem report looks exactly the same. I've had periodic crashes. I own a Thanksgiving purchased 2017 iMac. Issues appear to have started about this past mid-June. Innocuously, but painful the problem started with some iPhone photos would be corrupted when auto importing into Photo (fine on iCloud). I'd fix that by going into my iCloud and downloading from there. That problem seemed to be better when changing internet providers. However, eventually Photos would crash. More recently multiple apps crash, Music for instance, sometimes Contacts. This got progressively worse when upgrading to 11.1 from 11.0. After 11.1 Photos continues to say "Restoring from iCloud." I've been running diagnostics and send to Apple for weeks now. I understand it's pretty far up into the ranks of engineers. Initially, the person at Apple said that something on iOS reset the Photos on iCloud. And that is should resolve. When it didn't it went up the chain... From my end, there are no noticeable issues with hard drives or memory. When the Apple person calls back I'm going to insist on reinstalling 11.1.

Mar 7, 2021 1:20 PM in response to mapkrk

Mine is a brand new 16" MacBook Pro so it's not just older ones. Not just USB devices, mine crashes the same way if the only external device is an HDMI or DP external monitor. Another thread mentioned turning off Wi-Fi, and using ethernet. It still crashes. It does seem to happen more often right after waking the machine. I think we should also specify if this is the "com.apple.remoted" crash or the "com.apple.WindowServer" crash. I think these are two different issues getting mixed together. Mine is always "com.apple.remoted" that causes watchdog to reboot.

Apr 1, 2021 9:27 AM in response to NJ Ron

It's also happening on iMac Pro (2017). There's a whole thread in the developer's forums as well.


This is the common log message:

no successful checkins from com.apple.WindowServer


I "upgraded" to Big Sur last Friday and then these started:


$ last reboot


reboot    ~                         Thu Apr  1 08:26 

reboot    ~                         Wed Mar 31 19:59 

reboot    ~                         Tue Mar 30 21:28 

reboot    ~                         Tue Mar 30 07:52 

reboot    ~                         Mon Mar 29 20:09 

reboot    ~                         Mon Mar 29 17:46 

reboot    ~                         Fri Mar 26 18:25


I have two external monitors and an external hard drive for Time Machine. My computer would stay up for months when I was running Catalina.


It always crashes when I'm away from my desk, usually for a long time, although today's crash happened when I had only stepped away for about a 45 minutes.

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Big Sur kernel panic

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