MacBook Pro freezes during Fast User Switching

jmi11ionaire wrote:

I am having this exact same issue across both my macbook pro and my new mac mini. its very specifically triggered by fast user switching, and I had been assuming it was related to the displays hooked up to the mini but was able to reproduce on the macbook too. I think its a bug in MacOS 27.0.1

can we please get engineers to look into this, this functionality should not be difficult for these machines with the hardware they have. its an infinite frozen loop. the interesting part (on my mac mini at least) is that the login screen freezes but the machine itself is working fine, I am able to SSH and do remote tasks on it.

Readers on this User-to-user forum are great at making divergent suggestions about what to try and what experiments to run. Apple employees do not participate on these User-to-User forums.

To get Apple engineering to take notice, you need to contact support and work with them to solve the problem, or escalate the issue to a Specialist, to work with you and possibly take comprehensive data for a Formal, Tracked Bug Report.

Support

To file an informal 'heads up, there is a problem' type report use the Product Feedback pages and file a type Bug Report.

Product Feedback - Apple

Make sure "Reopen windows when logging in" is check when you log out or reboot which should allow anything open at the time to reopen automatically when you log back into your user account.

See the following Apple article for details:

Prevent apps and windows from reopening on Mac - Apple Support

¿Are you quite certain if freezes?

You may just be asking for a LOT at once, and it may be taking an annoying amount of time to get there.

How much RAM memory is in use just BEFORE you ask it to switch?

All that context will have to get put away on disk to make room for another User to start up.

When switching back without logging out, a batch of stuff needs to be put away, then the other User's stuff needs to be put in place and checkpoint-restarted to make the switch.

It's complicated.

I am having this exact same issue across both my macbook pro and my new mac mini. its very specifically triggered by fast user switching, and I had been assuming it was related to the displays hooked up to the mini but was able to reproduce on the macbook too. I think its a bug in MacOS 27.0.1

can we please get engineers to look into this, this functionality should not be difficult for these machines with the hardware they have. its an infinite frozen loop. the interesting part (on my mac mini at least) is that the login screen freezes but the machine itself is working fine, I am able to SSH and do remote tasks on it.

First you need to determine (by waiting it out for a longer time) whether this is really a freeze or is just taking a really long time.

Next we can talk about what might be causing such issues.

I wish I had an answer but adding that I have the EXACT same problem on my M1 mini. Freezes when trying to log back into the original user on entering password after secondary user has logged in.