John SiracusaSep 27, 2023

Oh noooooo! FB12122106 still exists in macOS 14.0 (23A344)

https://mastodon.social/@siracusa/110117776662224597

https://youtu.be/h0bKmcsMFvw

I wasn’t able to reproduce it in a clean install of Sonoma, so it's obviously something related to my specific configuration. But damned if I know what it is…

FB12122106 Demonstration

YouTube
Show threadJohn SiracusaSep 27, 2023

Still trying to track down this bug https://mastodon.social/@siracusa/110255326994000695

To review:

1. It happens only when more than one user is logged in.

2. It does not happen on a clean install of Sonoma—but it does happen on my actual install of Sonoma.

3. It happens even when the only two users logged in are two newly created user accounts.

4. No non-Apple KEXTs are installed.

Given all of this, I've been looking in /Library for culprits. Is there some other place I should be looking?

Show threadJohn SiracusaSep 28, 2023

Important update to https://mastodon.social/@siracusa/110255326994000695

The bug *is* reproducible on a clean install of macOS 14.0 (23A344).

It was not reproducible in an earlier Sonoma beta, but that changed some time between then and the release version.

At least I can stop tearing third-party software out of my system now…

…but now it’s time to try removing some hardware…

(Reminder for Apple folks: this is FB12122106.)

Show threadJohn SiracusaSep 28, 2023
I've re-filed this bug against Sonoma specifically (because some Apple folks tell me this is a useful thing to do). Please see FB13211706 for a newly summarized report with new spindumps, samples, a sysdiagnose, and a new demonstration video.
Show threadJohn SiracusaOct 3, 2023

I'm looking for someone with access to a 2019 Mac Pro (preferably with a Radeon Pro Vega II GPU) to try to reproduce FB13211706 as demonstrated in https://youtu.be/5Aq2GZpKkLU

Has Apple tried to reproduce it internally? I don't know. I've had no response in the Feedback app since I filed my original report six months ago. So I'm looking for a someone who is willing to actually communicate with me to tell me if it's just my Mac or what.

FB13211706: Window dragging is laggy and jumpy when more than one user is logged in

YouTube
Show threadSteve Troughton-SmithOct 3, 2023
@siracusa I can't repro on M1 at aaaaall. I would be curious to hear if it can repro on any Intel machine, or with any AMD GPU. What kind of mouse/trackpad are you using, too? And what screen resolution?
Show threadJohn SiracusaOct 3, 2023
@stroughtonsmith I tried it on an Intel MacBook Air and it doesn’t reproduce. I’m using the keyboard that came with the Mac Pro (connected via USB) and a Microsoft Precision Mouse (also connected by USB). I’ll try another mouse…
Show threadSteve Troughton-SmithOct 3, 2023
@siracusa I think I’m able to reproduce this in my ESXi Sonoma VM? The lag is probably Screen Sharing, but look what happens at the end. This is at lowdpi 2560x1600
Show threadSteve Troughton-SmithOct 3, 2023
@siracusa and a second take: is this the same issue? Does your YouTube video demonstrate two issues? …does your mouse have a CPU polling issue which triggers a different bug but may not be specific to your mouse?
Show threadJohn SiracusaOct 3, 2023
@stroughtonsmith That sure looks similar, though not as severe. But I’m at a loss as to what in the world could require the specific set of circumstances on my Mac: USB connection to my Microsoft mouse, multiple logged-in users, and many visible windows near the window being moved.
Show threadSimon StokesOct 3, 2023
@siracusa @stroughtonsmith recreated with usb connected mouse, absolutely no issues with Apple Bluetooth trackpad.
Show threadottO
@stokes @siracusa @stroughtonsmith you are lucky, my magic trackpad crashes the windowserver if I use it to scroll for a period
Oct 3, 2023 at 5:14pmWeb