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

Dec 17, 2019 1:49 AM in response to LordLobby

LordLobby wrote:

Apple, ***!!!

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!!

You would think ... !


I was discussing with Apple the other day, and it seems strange they do not monitor these forums. It would strike me as a no brainer just to keep an eye out for those threads which go above a certain number of replies, as they would indicate a widespread problem, but no.


Anyway, yes, like yours, mine was always crashing when my monitor went to sleep.


I was also having a problem with my Cable Matters USB-c unpowered ethernet/USB hub, which wasn't recognised. So I tried to book a Genius Bar appointment, something which Apple has made very difficult now (all automated and unless you answer questions a certain way on the app or the website, you won't get an appointment). I couldn't, so I went to the store, where they said I couldn't have an appointment as they were full. So I threw all my toys out of the pram, and finally they got a technician out from round the back. It was either that or they were going to have get some men in white coats to come and take me away.


We tested a Caldigit TS3 (http://www.caldigit.com/ts3-plus) as the solution to the ethernet hub problem (and because it might deliver enough power to charge my iPad etc). I was nervous of spending that much, because it only delivers 85W and the new MacBook can take up to 96W.


Anyway, nearly 24 hours later and this Caldigit a) seems to provide enough power for the MacBook, an iPhone, an iPad connected simultaneously, and b) I don't want to tempt fate here, but since I bought it yesterday, and plugged the monitor into the caldigit, rather than directly into the Mac, I have not had another sleep crash.


It may also relate to the fact that I have changed the setting System Preferences > Energy Saving > Power Adapter > 'Turn display off after' to 'Never' (I wonder if this is an error when the MBP tells an external monitor to sleep and gets some sort of unexpected response, but I don't even know if that setting applies to external monitors). I have switched back to Turn display off after one minute and see if it crashes 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 17, 2019 3:39 AM in response to LordLobby

LordLobby wrote:

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.


After setting the energy saving back to 'turn display off after 1 minute', it crashed again! So clearly Caldigit did not stop that issue.


Solution for me is to set 'turn display off' to 'never'.


And yes, I expected the MacBook Pro to have enough power to drive an ethernet adaptor. But maybe the issue is something other than power.

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 19, 2019 11:11 AM in response to LordLobby

I have been having the crashing problem too. I am in safe mode now and for 1 day and 15 the system has not crashed. There are two applications that I need to use on my iMac - both use Java as the underlying language. I also have a 2019 MacBook Pro with the Developer's version on the Catalina OS. I have never had the problem on my 2019 MacBook Pro.


Apple support helped me downgrade the OS on why iMac 5K ( Late 2015, 32 Gig Fusion Drive) which Apple replaced the Hard Drive and the wireless card in an attempt to solve the problem before it went out of warrantee. The hardware replacements did not fix the problem. Safemode and Mojavi work fine with the Catalina OS.


Is it possible that Java is not updated to the right version in order for my Java based apps to work properly?


Are you using any Java based applications on your machine? Is it possible that these are causing the problem?


I have a call into Apple Support again so we can try and reinstall parts of Catalina. Now that we have seen that Safe Mode seems to work for a long period of time.

Dec 24, 2019 7:11 AM in response to urix

For some reason I will get the crash when my computer goes to sleep. Only once while using it. I used to think it was related to Google Drive Updating in the background, but that might have been a different issue. Multiple monitors not a factor.

If it is a multi-thread race condition, as one user suggested, then could the number of CPUs be related to the frequency of the problem? I have 4 CPUs. If this had anything to do with the problem people with 12 to more would see it more frequently.

If I put my computer to sleep manually, it doesn't happen currently.

Dec 26, 2019 1:06 PM in response to ProfessorScott

Been getting a similar issue. I seem to be able to stop the crash when I change the Screen Saver to something other than Catalina.


I have a Mac mini, 2018 and have two Apple LED Cinema Displays, connected via adapters from Thunderbolt to DisplayPort. I see that 10.15.3 has fixed it for someone, lets hope it does. I keep sending crash reports to Apple!

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


Oct 16, 2019 2:43 AM in response to vidscmd

Today on 16 October 2019 after installing the latest version of OS i had this crash happened to me when I was using Web Storm app.




panic(cpu 2 caller 0xffffff7f8d19cad5): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 140 seconds

service: com.apple.logd, total successful checkins since wake (7930 seconds ago): 794, last successful checkin: 0 seconds ago

service: com.apple.WindowServer, total successful checkins since wake (7930 seconds ago): 780, last successful checkin: 140 seconds ago


Backtrace (CPU 2), Frame : Return Address

0xffffff8128ecb820 : 0xffffff800c73f98b

0xffffff8128ecb870 : 0xffffff800c876c15

0xffffff8128ecb8b0 : 0xffffff800c86861e

0xffffff8128ecb900 : 0xffffff800c6e6a40

0xffffff8128ecb920 : 0xffffff800c73f077

0xffffff8128ecba20 : 0xffffff800c73f45b

0xffffff8128ecba70 : 0xffffff800ced2e05

0xffffff8128ecbae0 : 0xffffff7f8d19cad5

0xffffff8128ecbaf0 : 0xffffff7f8d19c7e6

0xffffff8128ecbb10 : 0xffffff800ce67adb

0xffffff8128ecbb60 : 0xffffff800ce70a73

0xffffff8128ecbca0 : 0xffffff800c826672

0xffffff8128ecbdb0 : 0xffffff800c7457f8

0xffffff8128ecbe10 : 0xffffff800c71c515

0xffffff8128ecbe70 : 0xffffff800c732f75

0xffffff8128ecbf00 : 0xffffff800c84eaf5

0xffffff8128ecbfa0 : 0xffffff800c6e7226

Oct 16, 2019 4:08 PM in response to VardgesM

Updated to 10.15 and ran the update today and I'm also getting the same result as VardgesM. Before today's update "Looks like auto firing of sleep event is firing crash code" this was true of me when connected to external monitors. After today's update, the crash is happening if I'm idle for some period of time (not sure how long but its happened twice - maybe 5-10 minutes). Not in sleep mode, sleep mode not auto firing just hangs and crashes after afk for a short period


panic(cpu 2 caller 0xffffff7f9d19cad5): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 140 seconds

service: com.apple.logd, total successful checkins since load (11690 seconds ago): 1170, last successful checkin: 0 seconds ago

service: com.apple.WindowServer, total successful checkins since load (11660 seconds ago): 1145, last successful checkin: 140 seconds ago


Backtrace (CPU 2), Frame : Return Address

0xffffffa4067bb820 : 0xffffff801c73f98b

0xffffffa4067bb870 : 0xffffff801c876c15

0xffffffa4067bb8b0 : 0xffffff801c86861e

0xffffffa4067bb900 : 0xffffff801c6e6a40

0xffffffa4067bb920 : 0xffffff801c73f077

0xffffffa4067bba20 : 0xffffff801c73f45b

0xffffffa4067bba70 : 0xffffff801ced2e05

0xffffffa4067bbae0 : 0xffffff7f9d19cad5

0xffffffa4067bbaf0 : 0xffffff7f9d19c7e6

0xffffffa4067bbb10 : 0xffffff801ce67adb

0xffffffa4067bbb60 : 0xffffff801ce70a73

0xffffffa4067bbca0 : 0xffffff801c826672

0xffffffa4067bbdb0 : 0xffffff801c7457f8

0xffffffa4067bbe10 : 0xffffff801c71c515

0xffffffa4067bbe70 : 0xffffff801c732f75

0xffffffa4067bbf00 : 0xffffff801c84eaf5

0xffffffa4067bbfa0 : 0xffffff801c6e7226

Oct 17, 2019 8:29 AM in response to ProfessorScott

Still having the issue after updated to 19A602"


panic(cpu 10 caller 0xffffff7f8ab9cad5): userspace watchdog timeout: no successful checkins from com.apple.WindowServer in 140 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 wake (1590 seconds ago): 160, last successful checkin: 0 seconds ago

service: com.apple.WindowServer, total successful checkins since wake (1590 seconds ago): 144, last successful checkin: 140 seconds ago


Backtrace (CPU 10), Frame : Return Address

0xffffff83b4bdb820 : 0xffffff800a13f98b

0xffffff83b4bdb870 : 0xffffff800a276c15

0xffffff83b4bdb8b0 : 0xffffff800a26861e

0xffffff83b4bdb900 : 0xffffff800a0e6a40

0xffffff83b4bdb920 : 0xffffff800a13f077

0xffffff83b4bdba20 : 0xffffff800a13f45b

0xffffff83b4bdba70 : 0xffffff800a8d2e05

0xffffff83b4bdbae0 : 0xffffff7f8ab9cad5

0xffffff83b4bdbaf0 : 0xffffff7f8ab9c7e6

0xffffff83b4bdbb10 : 0xffffff800a867adb

0xffffff83b4bdbb60 : 0xffffff800a870a73

0xffffff83b4bdbca0 : 0xffffff800a226672

0xffffff83b4bdbdb0 : 0xffffff800a1457f8

0xffffff83b4bdbe10 : 0xffffff800a11c515

0xffffff83b4bdbe70 : 0xffffff800a132f75

0xffffff83b4bdbf00 : 0xffffff800a24eaf5

0xffffff83b4bdbfa0 : 0xffffff800a0e7226

Kernel Extensions in backtrace:

com.apple.driver.watchdog(1.0)[58392D62-D9E8-3022-85C1-B78AC93B9167]@0xffffff7f8ab9b000->0xffffff7f8aba3fff


BSD process name corresponding to current thread: watchdogd

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


Mac OS version:

19A602

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Since installing Catalina yesterday, multiple crashes from userspace watchdog timeout

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