What is SOCD report detected: (AP watchdog expired)?

I narrowed this down to the USB-A ports and older USB devices.

I had a USB 4-port hub with a few USB devices attached and it would do it. I took out the hub and just had a 10-year-old USB drive I was using for my TimeMachine backup and it still did it, but less often. I disconnected the USB drive and it hasn't done it for three weeks straight.

I now just hook up the backup drive abou3 times a week just long enough to do a backup and then disconnect it.

Just bought this Mac mini 3 weeks ago. Right in the middle of working my screen went green and this came up after it restarted. Just an hour ago I updated the OS to version 11.4. First time this is happened so I think it’s a issue with this new version of Big Sur. :(

It was this Sabrent 4-port USB hub. It has served me well with 2 different Intel Mac minis, so I suspect that it is the USB 2.0 model.

I plugged it in long enough for System Report to verify it is USB 2.0.

Hi circatee,

Thanks for coming to Apple Support Communities for help today with the error message on your M1 Mac mini.

We'd like to look into this a bit further with you. Please be sure the Mac mini is fully updated and visit: Get Support.

Have a fantastic day!

Yep, same here. I had a nice stretch of a few weeks without it happening, then yesterday hit. My computer restarted on its own 17 time in a row. Comp would restart and within 15-20 seconds each time it would restart. Just did it again today.

Just got this error recently. Doesn't happen often, maybe one every 3-5 days if my Mini is left on. Problem is, resetting the SMC on the M1 isn't something you can do. It functionally reset the SMC every time you power it off. It's not a troubleshooting step that can be taken. I've heard it can be related to using a USB hub, which is necessary for myself and well as many others as two USB-A and two USB-C (Assuming you don't use a second monitor) is hardly enough. If I get it a third time I'm going to submit a support ticket about it. We'll see what happens with the next update.

Same here every day I get back to my Mac mini M1 it got restarted and shows this error message. Wonder if it's not also related to the Bluetooth issues everyone is experiencing... I do have a USB hub maybe you are right... but not using that is not an option!

I am also experiencing this with an M1 barely 6 months old. However, this issue is fairly new. I don't recall when exactly, but it started perhaps two macOS updates ago. And it has been happening more frequently now.

M1 Mac mini, macOS 11.3.1; Watch, series 5 GPS/cellular, watchOS 7.4.1; iPad Pro 2nd Gen, iPadOS 14.5.1; iPad Air 2, iPadOS 14.5.1; iPhone 12 Pro, iOS 14.5.1; TV 4th Gen, tvOS 14.5  HomePods, audioOS 14.5 and Airport Express w/ Airplay 2

Just happened to me on a brand new M1. The same thing happened on my other computer, which I purchased 6 months ago. Took it to the apple store and they replaced it with a new one ( less than a month ago) I'm not exactly sure why they offered to do this but it just happened again. I wasn't on Big Sur with the last one but am now.

I have a Mini M1 and never had this issue. Yesterday, I added a Caldigit Element Hub (TB4/C and USB A 3.2) that also has a power supply engaged. Today, my system did as what happened to many others here - a reboot and an error about "AP watchdog expired."

I'm curious if others who noticed it happening with docks/hubs if

1) the device was supporting Thunderbolt or only up to USB C 3.2 or...?

2) the device used its own power supply and if so, was it being used when the problem happened?

3) did you simply have an external drive and no hub attached when it happened and if so, Thunderbolt, USB C 3.2 or ...?

Obviously looking for any possible specifics associated or if it is random or if several combinations are generating this problem. I sure hope this is not like the issue with the monitors many have had and Apple didn't make any real effort to fix (on going for months)

I've had my M1 mini 16GB 1TB (OS 11.4) for just over 3 months now. Just got this restart/error for the first time. I was running the same apps that I always have open 24/7. I haven't done anything odd in the last day. I wasn't even at my computer when it rebooted.

I do not have a hub, but I do have a monitor with extra USB ports, so essentially a hub. I have had this monitor plugged in since day 1.

I also have a Kensington trackball and an external USB drive, also plugged in since day 1.

It just happened to me and in my search came across this thread. I have the latest OS and was just browsing the web. This is my first time. Is this going to continue to be a problem or can this be fixed via a firmware update?

I've just experienced same. Have had my M1 MacBook Air for over six months. Have a back-up drive attached (since day 1) and added an external hub some months ago, but have not had the problem previously. Came up with a green screen, then restarted and got the AP watchdog expired message.

It is looking like externals are likely not the cause (though there could be more than 1 cause). What apps are we running? Here are the apps I was running at the time:

Thunderbird

Firefox

Vienna

BBEdit