Since installing Catalina yesterday, multiple crashes from userspace watchdog timeout

Since I installed Catalina yesterday, I have had around five crashes with the error:


panic(cpu 6 caller 0xffffff7f8879cad5): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 140 seconds


Any solutions. iMac Pro had been operating fine before update. Only apps running at the time were Chrome and TimeMachine backing up to a Drobo 5N2 (plus of course background apps like Google Backup and Sync, Dropbox, etc).

iMac Pro

Posted on Oct 8, 2019 9:20 AM

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Posted on Apr 14, 2020 1:23 AM

I solved! it was enough to start the PC and press cmd+R and keep it pressed until a screen appears to reinstall the operating system. I chose to reinstall it, and it was the correct choice, I have not lost any data, simply reinstalled the OS from the beginning. After 45 minutes the OS is back to 100% operational, it restarts and shuts down regularly, I don't tell you how happy I feel! try it too. i follow this instruction:

<< (Restart, while holding Command-R)

If you can, run Disk Utility, and try a Repair Disk.

If that completes with no problems found, Quit Disk Utility, which will return you to the recovery menu.

Then, you will likely want to Reinstall OS X. It will use your internet

connection to download the system, then will continue with the

reinstall. You won't lose your own files and apps, but the reinstall

will simply reinstall the system in place.

Assuming your boot drive is still good, that should fix your kernel panic issue. >>


Link: https://forums.macrumors.com/threads/panic-cpu-2-caller-error.1961380/




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577 replies

Nov 25, 2019 6:07 AM in response to ProfessorScott

I have the same problem since updating MacBook Air to Catalina, currently will all updates at 10.15.1.


panic(cpu 2 caller 0xffffff7f91aecad5): userspace watchdog timeout: no successful checkins from com.apple.logd in 130 seconds

service returned not alive with context : unresponsive dispatch queue(s): com.apple.firehose.drain-mem, com.apple.firehose.io-wl

service: com.apple.logd, total successful checkins since load (3890 seconds ago): 377, last successful checkin: 130 seconds ago

service: com.apple.WindowServer, total successful checkins since load (3860 seconds ago): 386, last successful checkin: 0 seconds ago


Backtrace (CPU 2), Frame : Return Address

0xffffff801bb9b820 : 0xffffff8010f39a3b

0xffffff801bb9b870 : 0xffffff8011070fe5

0xffffff801bb9b8b0 : 0xffffff8011062a5e

0xffffff801bb9b900 : 0xffffff8010ee0a40

0xffffff801bb9b920 : 0xffffff8010f39127

0xffffff801bb9ba20 : 0xffffff8010f3950b

0xffffff801bb9ba70 : 0xffffff80116d1875

0xffffff801bb9bae0 : 0xffffff7f91aecad5

0xffffff801bb9baf0 : 0xffffff7f91aec7e6

0xffffff801bb9bb10 : 0xffffff80116663fb

0xffffff801bb9bb60 : 0xffffff801166f393

0xffffff801bb9bca0 : 0xffffff8011020b92

0xffffff801bb9bdb0 : 0xffffff8010f3f8b8

0xffffff801bb9be10 : 0xffffff8010f16545

0xffffff801bb9be70 : 0xffffff8010f2cff5

0xffffff801bb9bf00 : 0xffffff8011049085

0xffffff801bb9bfa0 : 0xffffff8010ee1226

Kernel Extensions in backtrace:

com.apple.driver.watchdog(1.0)[AA44EEB8-57FA-3CAC-9105-C7AB21900B9A]@0xffffff7f91aeb000->0xffffff7f91af3fff


BSD process name corresponding to current thread: watchdogd


Mac OS version:

19B88


Kernel version:

Darwin Kernel Version 19.0.0: Thu Oct 17 16:17:15 PDT 2019; root:xnu-6153.41.3~29/RELEASE_X86_64

Kernel UUID: 7503CD47-851F-321E-8747-50DB4299165F

Kernel slide: 0x0000000010c00000

Kernel text base: 0xffffff8010e00000

__HIB text base: 0xffffff8010d00000

System model name: MacBookAir6,2 (Mac-7DF21CB3ED6977E5)

System shutdown begun: NO

Panic diags file available: YES (0x0)


System uptime in nanoseconds: 3905745129049

last loaded kext at 962845543546: @filesystems.afpfs 11.1 (addr 0xffffff7f945e1000, size 360448)

last unloaded kext at 2389568961504: >!A!ILpssI2C 3.0.60 (addr 0xffffff7f91e21000, size 40960)

loaded kexts:

@filesystems.afpfs 11.1

@nke.asp-tcp 8.0.2

>AudioAUUC 1.70

>!AGraphicsDevicePolicy 4.5.9

@AGDCPluginDisplayMetrics 4.5.9

@fileutil 20.036.15


Dec 4, 2019 9:12 AM in response to MegaJustice

Wow ... thanks MegaJustice for the feedback, quite astonishing if it is true ...


I have to say that I participated to this thread as I had also this problem without having any external monitor plugged, only Time Machine...


And I have to mention also that since I switched from my 2019 MBP 15" to a 2019 MBP 16" I never have had this problem again...


Could this be machine/harwdware related ?


Anyway I will follow you advice, and if it happen again I will open a ticket at Apple support.


Thanks to the community anyway to always report and give feedbacks.

Dec 13, 2019 11:00 PM in response to ProfessorScott

I am on a MacBook Air 13-inch, Mid 2012 with no external monitor or anything plugged into it. It has crashed on me twice in the last 4 hours and twice a few days ago. I am using Catalina updated to 10.15.2


But I am writing a massive paper for my Masters degree. This is terrifying every time it dies, afraid I am going to lose my 25 page paper.





panic(cpu 2 caller 0xffffff7f87cefa8d): watchdog timeout: no checkins from watchdogd in 93 seconds (1338 total checkins since monitoring last enabled)


Backtrace (CPU 2), Frame : Return Address


0xffffff8099ff3c40 : 0xffffff800713bb1b 


0xffffff8099ff3c90 : 0xffffff80072733e5 


0xffffff8099ff3cd0 : 0xffffff8007264e5e 


0xffffff8099ff3d20 : 0xffffff80070e2a40 


0xffffff8099ff3d40 : 0xffffff800713b207 


0xffffff8099ff3e40 : 0xffffff800713b5eb 


0xffffff8099ff3e90 : 0xffffff80078d2575 


0xffffff8099ff3f00 : 0xffffff7f87cefa8d 


0xffffff8099ff3f10 : 0xffffff7f87cef467 


0xffffff8099ff3f50 : 0xffffff7f87d41e76 


0xffffff8099ff3fa0 : 0xffffff80070e213e 


      Kernel Extensions in backtrace:


         com.apple.driver.watchdog(1.0)[EFAA17B9-A62C-30B7-9602-0BB5282EDDD6]@0xffffff7f87cee000->0xffffff7f87cf6fff


         com.apple.driver.AppleSMC(3.1.9)[CA7CACA5-58A6-3E59-9F67-2422183AB544]@0xffffff7f87d34000->0xffffff7f87d52fff


            dependency: com.apple.iokit.IOACPIFamily(1.4)[3467C105-9354-3BD2-85F3-E5AEF94BD275]@0xffffff7f87ce5000


            dependency: com.apple.driver.watchdog(1)[EFAA17B9-A62C-30B7-9602-0BB5282EDDD6]@0xffffff7f87cee000


            dependency: com.apple.iokit.IOPCIFamily(2.9)[1286D5E5-A6A1-3C44-A244-04C068903DB2]@0xffffff7f87cf7000




BSD process name corresponding to current thread: kernel_task




Mac OS version:


19C57




Kernel version:


Darwin Kernel Version 19.2.0: Sat Nov  9 03:47:04 PST 2019; root:xnu-6153.61.1~20/RELEASE_X86_64


Kernel UUID: C3E7E405-C692-356B-88D3-C30041FD1E72


Kernel slide:     0x0000000006e00000


Kernel text base: 0xffffff8007000000


__HIB  text base: 0xffffff8006f00000


System model name: MacBookAir5,2 (Mac-2E6FAB96566FE58C)


System shutdown begun: NO


Panic diags file available: YES (0x0)

Dec 15, 2019 8:02 AM in response to ProfessorScott

This issue happened with My Mac Pro 2019 since I upgrade to 10.5.2 more than 3 times a day


panic(cpu 2 caller 0xffffff7f9779dad5): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds


service: com.apple.logd, total successful checkins since wake (660 seconds ago): 67, last successful checkin: 0 seconds ago


service: com.apple.WindowServer, total successful checkins since wake (660 seconds ago): 55, last successful checkin: 120 seconds ago




Backtrace (CPU 2), Frame : Return Address


0xffffff91486d3820 : 0xffffff8016d3bb1b 


0xffffff91486d3870 : 0xffffff8016e733e5 


0xffffff91486d38b0 : 0xffffff8016e64e5e 


0xffffff91486d3900 : 0xffffff8016ce2a40 


0xffffff91486d3920 : 0xffffff8016d3b207 


0xffffff91486d3a20 : 0xffffff8016d3b5eb 


0xffffff91486d3a70 : 0xffffff80174d2575 


0xffffff91486d3ae0 : 0xffffff7f9779dad5 


0xffffff91486d3af0 : 0xffffff7f9779d7e6 


0xffffff91486d3b10 : 0xffffff8017466fcb 


0xffffff91486d3b60 : 0xffffff8017470083 


0xffffff91486d3ca0 : 0xffffff8016e22c22 


0xffffff91486d3db0 : 0xffffff8016d41998 


0xffffff91486d3e10 : 0xffffff8016d18625 


0xffffff91486d3e70 : 0xffffff8016d2f0d5 


0xffffff91486d3f00 : 0xffffff8016e4b485 


0xffffff91486d3fa0 : 0xffffff8016ce3226 


      Kernel Extensions in backtrace:


         com.apple.driver.watchdog(1.0)[EFAA17B9-A62C-30B7-9602-0BB5282EDDD6]@0xffffff7f9779c000->0xffffff7f977a4fff




BSD process name corresponding to current thread: watchdogd


Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev




Mac OS version:


19C57


Dec 16, 2019 5:13 AM in response to ProfessorScott

Apple, WTF!!!


This crash is perfectly reproducable and happens always when the monitors goes to sleep... Anyway, there should be thousands of crash-reports with the same problem. Get the **** thing working!!


What drives me nuts is, software quality seems to be an unknown word for Apple, they take as much money they can from customers and provide lowest quality these days.


The whole Apple experience is really approaching the same situation why I switched from MS and PCs to Apple 10 years ago... Maybe time to change again.

Dec 17, 2019 3:09 AM in response to guthrie66

Genius Bar: You seem to be brave... I would never have the idea to really try it and expect a solution. Anyway, your "driven nuts by Hipster stuff" report seems to support my bias ;-)


My monitors are connected to an iMacPro through an usb-c to HDMI converter, and I don't have any further unpowered usb-c stuff attached. Further, I expect the iMac to have enough power to drive things.


Before updating to Catalina I never encountered the now seen crash.

Dec 18, 2019 10:16 AM in response to herve112

Unfortunately, Catalina 10.15.2 did not work for me. I still get the crashing and the frequency has picked up to about 8 crashes per day.


My computer is a late 2015 IMac with 32 Gig memory and 2 TB Fusion Drive.


I took the computer into the Apple Store and they had replaced the drive and the Wireless card, but none of that helped. Finally they downgraded to Mojavi and it worked until I got notification that 10.15.2 was available and there were a number of reports that this version fixed the problem.


The problem is not fixed.


I am NOT using an eternal monitor on my system configuration.

Dec 29, 2019 12:17 AM in response to ProfessorScott

panic(cpu 2 caller 0xffffff7f9704bad5): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds

service returned not alive with context : is_alive_func returned unhealthy : WindowServer initialization not complete (post IOKitWaitQuiet)

service: com.apple.logd, total successful checkins since load (9850 seconds ago): 986, last successful checkin: 0 seconds ago

service: com.apple.WindowServer, total successful checkins since load (9790 seconds ago): 946, last successful checkin: 120 seconds ago


Backtrace (CPU 2), Frame : Return Address

0xffffff9154b6b820 : 0xffffff8015f3bb1b

0xffffff9154b6b870 : 0xffffff80160733e5

0xffffff9154b6b8b0 : 0xffffff8016064e5e

0xffffff9154b6b900 : 0xffffff8015ee2a40

0xffffff9154b6b920 : 0xffffff8015f3b207

0xffffff9154b6ba20 : 0xffffff8015f3b5eb

0xffffff9154b6ba70 : 0xffffff80166d2575

0xffffff9154b6bae0 : 0xffffff7f9704bad5

0xffffff9154b6baf0 : 0xffffff7f9704b7e6

0xffffff9154b6bb10 : 0xffffff8016666fcb

0xffffff9154b6bb60 : 0xffffff8016670083

0xffffff9154b6bca0 : 0xffffff8016022c22

0xffffff9154b6bdb0 : 0xffffff8015f41998

0xffffff9154b6be10 : 0xffffff8015f18625

0xffffff9154b6be70 : 0xffffff8015f2f0d5

0xffffff9154b6bf00 : 0xffffff801604b485

0xffffff9154b6bfa0 : 0xffffff8015ee3226

Kernel Extensions in backtrace:

com.apple.driver.watchdog(1.0)[EFAA17B9-A62C-30B7-9602-0BB5282EDDD6]@0xffffff7f9704a000->0xffffff7f97052fff


BSD process name corresponding to current thread: watchdogd


Mac OS version:

19C57


Jan 8, 2020 4:24 AM in response to ProfessorScott

Just to add a "Me To" .. also seeing this WindowsServer hang since Catalina upgrade on my Mac Pro (iBin);


OSX 10.15.2. / Mac Pro Late 2013 / 3.7 Quad-Core / 12GB / AMD FirePro D300 - two screens DisplayPort 4K / HDMI 1080 - two USB Drives attached with one as target for TimeMachine.


Typically seeing this;

panic(cpu 2 caller 0xffffff7f9623fad5): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 120 seconds


It's making the machine unusable. Sometimes getting a couple of hours working, sometimes it's hanging within minutes of the watchdog restarting it.



This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Since installing Catalina yesterday, multiple crashes from userspace watchdog timeout

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