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SOCD report detected: (AP watchdog expired)

Mac Mini M1 16GB keeps crashing and then restarting randomly on all applications with following error message:

I was asked by Apple second level support to provide details of the crash reports logged when it happens. 

It is [SOCD report detected: (AP watchdog expired)


SOCD report detected: (AP watchdog expired)


Even when idle. 


Steps taken with 2nd level support:

  1. MAC OS REINSTALL.
  2. MAC DISK ERASE AND REINSTALL FROM ICLOUD.
  3. ISSUE ALSO HAPPENS IN GUEST MODE LOG IN.


Mac mini, macOS 11.2

Posted on Feb 11, 2021 2:23 AM

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Question marked as Top-ranking reply

Posted on Feb 28, 2021 1:01 AM

Apple 2nd level support seemed to think it was due to external hard drive issues. They asked me to test without drive connected.


can confirm now that the SOCD crash would only occur with My external USB A Western Digital Hard drive physically connected. After disconnecting it has not happened again, so far. After 5 days.


do you all have external drives connected?

365 replies

Mar 9, 2021 4:15 AM in response to circatee

Actually, the sleep schedule might be connected? I didn’t use it for the first month or so, but started using it since last week. Even with it I usually put my computer to sleep, but there was one night that it went to sleep by schedule. It is possible, but I’m not certain, that that was the night it happened.

Mar 9, 2021 1:17 PM in response to magic100

This just occurred while updating to latest BS OS update. I'm guessing but I suspect it may have something to do with the external hard drives. I keep two active one for tTimeMachine Backups and the other where I keep all active files. The third (an older drive) is connected for archiving old files. I had the third active when this happened.

Mar 12, 2021 6:55 AM in response to magic100

I just bought a new Mac Mini M1 16G 256 storage two days ago, Big Sur 11.2.3 installed and the same thing happened twice: green screen and reboot. Error log is [SOCD report detected: (AP watchdog expired). I was also using a WD external hard drive (circa 2012-13) to manually transfer documents (only one or two apps, both updated), and I believe the drive was attached during both incidents. Have detached and will update in a week or two.

Mar 17, 2021 3:04 PM in response to magic100

I have a brand new MacBook Air and this has been happening to me from Day 1. I have been regularly engaged with 2nd level support. I have repeatedly wiped my disk, reinstalled Big Sur, and worked without any peripherals. It is still happening and they are now going to take my machine and replace the logic board (apple-speak for mother board).

Mar 19, 2021 12:49 PM in response to RizzDat

I have a Timemachine drive and a drive where I keep my work that I work from. The internal drive on my M1 Mac Mini keeps my apps and system files and I clean out anything that may fill it up since it’s only an 256gb SD.


I mostly work with Photoshop and Final Cut Pro. The first error crash happened when I had third drive on which I usually eject but forgot. Weeks later it happened again while working on Photoshop. The third drive was not connected. Could be a software conflict perhaps? It was working fine with the two drives for the three months after I bought the Mac mini. I see many users having the same issue. Hope Apple can figure this out.

Mar 26, 2021 8:25 AM in response to magic100

I have been completely let down by Apple. More than 50 phone calls. So many in 2nd level support fail to call me at the time scheduled.


received interesting call from a very Senior Department in Apple USA during which i was informed that 13 Engineers are reading this thread great concern. They spent 90minutes asking detailed questions. Suggested I continue with 2nd level support on this matter. I wish i has explained that 2nd level support has not even physically examined or serviced my m1 mini yet, despite 3 months of phone calls, software reinstalling and log extraction.


unbelievable how bad my experience has been with Apple.

Mar 30, 2021 1:30 PM in response to magic100

Same thing happened to me, twice now with M1 Mac Mini 8GB purchased at the end of February. All of a sudden screen turns green and computer reboots, and the error message is the same "SOCD report detected: (AP watchdog expired)" - whatever that means. Have two external drives connected, but one time this happened with computer in sleep mode, the other time while using Spotify.

Apr 2, 2021 9:04 AM in response to magic100

I was having this issue every couple of days at the end of Feb with my new Mac Mini M1 (1TB, 16GB) with a Time Machine 4GB Seagate HDD (external power) plugged directly into one USB and the other USB going to a powered USB 3.0 Hub.


After reading about this issue on several sites, some suggested that it might be the USB HDD that was the problem. I moved the USB HDD to the powered USB hub instead (left the 2nd USB on the Mini blank). It has been a month using the computer 12+ hours a day and powered on 24/7. The error had not happened since.

Apr 6, 2021 2:43 PM in response to magic100

I have the exact same problem. Support suggested I take out everything connected to the M1 and any hubs, then restart at each phase and see what happened. (I did and all restarts worked properly)


This of course, was after doing an OS reinstall as well


They say if I can't replicate the error (get the M1 to crash), then they can't help me lol


Same log: SOCD report detected: (AP watchdog expired)


Would love to know a solution


Connected through a non-powered hub is a WD MY Book (I use this to back up certain files, once a month) and a Focusrite audio signal box.


Hub is connected directly to the M1, as is OWC for Time Machine, monitor, and dongle for wireless logitech keyboard


Also have speakers and an OWC for Time Machine connected to the M1


And like most of you all, support has unfortunately not been very helpful


Love to hear any fixes on this. Good luck to all!

Apr 8, 2021 3:31 AM in response to magic100

In addition to what I've written before:

Apple support reached out to me for troubleshooting, which was great, at least they are trying to figure out what is going on.


I still have my WD external drive connected for Time Machine, it's connected 24/7 and I have not had a AP Watchdog failure since it happened the first and only time. Since that first time I manually put the machine to sleep every night and manually wake it up. Not sure if that is connected.


Earlier today I initiated a manual reboot (after ± 2weeks of running and sleeping) and after boot I got an error specifying that the machine had to reboot because of an issue with the watchdog (not AP watchdog), I've send the report of to Apple hoping that it will be helpful.


I have also noticed that the machine is taking a loooooooong time to boot, it takes about 45 seconds before I get any indication that it is actually booting; screens are black, no chimes etc.


Apr 10, 2021 7:12 AM in response to magic100

Even if not running, Time Machine could cause issues. But good to know it does not seem to be peripherals as some report problem with no externals and some report no Time Machine running.

Therefore it is most likely that it is all Apple that needs to fix this ASAP!

Apple will keep bouncing it to the users — do this, do that, work with no external hard drives(!), etc. — over and over until, they wake up and fix it… in Cupertino.

SOCD report detected: (AP watchdog expired)

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