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Level 1

26 points

Latest ElCap upgrade hanging 10.11.6 - "Stalling for detach"

The most recent upgrade to ElCap (10.11.6) has resulted in the OS regularly hanging for one or more minutes. It has been reported on 2012 machines, and lately on more recent machines. Sometimes one can still move the mouse pointer during the hangand from time to time multiple actions will take place, and then the hang will resume.

The message in the Console is:

kernel: Stalling for detach from IntelAccelerator

kernel: Stalling for detach from nvAccelerator

There has been some discussion that this could be related to VirtualBox (Re: Stalling for detach from IntelAccelerator, nvAccelerator), but it also takes place on systems with no such installation.

It smells like an OS problem. How does one get someone at Apple to address this?

Posted on Dec 30, 2016 12:49 PM

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net-buoy Author

Level 1

26 points

Posted on Jan 3, 2017 2:31 PM

As it has been noted above, this was not introduced with 10.11.6, but likely with the updates Apple issue last month.

I have appended a screen shot of the updates I installed in December. Based on the comments, I am guessing that the culprit, as has been suggested, was the Security Update 2016-003, and I would be curious, gbbgu, if those you say are running 10.11.6 and not having the problem, have as yet to install that update, and whether the issue appearsafter they did an update..

As you can see it is not possible for me to differentiate among the 4 OS updates I installed on the 13th. Moreover, the issue did not appear until I was pushing quit a few high graphic windows, and the problem then disappears on rebooting until one gets to that point again....

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111 replies

sorphin

Level 1

4 points

Jan 17, 2017 8:52 PM in response to moon child

I'd suggest installing the update that was just put out.. I installed it earlier tonight after getting the notifications about it via the posts here.

Jan 18, 2017 6:11 AM in response to jabroome

Update has installed fine here. But now my console is full of mdworker mach deny lookup errors. Reindexing now, hope this helps.

Jan 18, 2017 9:44 AM in response to net-buoy

They released this update just as I was installing Sierra to get around it :-)

Ah well, it was high time I did install Sierra, and that also fixed it!

Jan 19, 2017 7:14 AM in response to lotlorien

I also have lots of mdworker messages, but I checked older logs and I was getting them before this update, so I don't think it's related.

Jan 19, 2017 7:23 AM in response to Mark Jenkinson

Two days in and the update seems to have resolved the issues. Haven't been able to go this long without a restart in a while. 🙂

Jan 19, 2017 7:26 AM in response to Barry Margolin

After reindexing they have completely disappeared for me. I only had them sometimes during the reindexing that tool 2 or 3 hours.

Latest ElCap upgrade hanging 10.11.6 - "Stalling for detach"