Stalling for detach from IntelAccelerator, nvAccelerator

Try uninstalling VirtualBox and see if it stops.

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Etrecheck – System Information

You are welcome.

I have same issue, again appearing only after recent upgrade.
I tried killing spindump as I heard that could be what is causing this, but that has not helped.

I have the exact same symptoms on my mid-2012 MBP (nVidia + Intel) running 10.11.6. I do software development in a bunch of VMs every day, and this definitely started in the past couple weeks. I think it's likely a bug or incompatibility between the latest OS update and VirtualBox.

None of my guests use 3D, so I've rolled back from VirtualBox 5.1.12 to 5.1.10 to see if it makes a difference. The VM that seems to be the trigger does use the guest additions, though, so there's some interaction on the video side.

I'm leaning towards an OS issue (perhaps a new video driver) on this one, because even after shutting down the offending VM, followed by all the others (an awful experience with the constant hangs), I still get really laggy scrolling or resizing in a browser window and end up rebooting.

Here are some of the logs, lots of video detaching and watchdogs:

Dec 29 10:09:29 myhost kernel[0]: stalling for detach from IntelAccelerator

Dec 29 10:10:14 --- last message repeated 1 time ---

Dec 29 10:10:23 myhost kernel[0]: stalling for detach from IntelAccelerator

Dec 29 10:10:38 myhost kernel[0]: stalling for detach from IntelAccelerator

Dec 29 10:10:38 myhost kernel[0]: stalling for detach from nvAccelerator

Dec 29 10:10:49 myhost watchdogd[353]: [watchdog_daemon] @(_wd_daemon_service_thread) -

service (com.apple.WindowServer) reported as unresponsive

Dec 29 10:10:51 myhost spindump[683]: Saved userspace_watchdog_timeout.spin report for

WindowServer version ??? (???) to /Library/Logs/DiagnosticReports/WindowServer_2016-1

2-29-101051_myhost.userspace_watchdog_timeout.spin

Dec 29 10:10:51 myhost spindump[683]: Removing excessive log: file:///Library/Logs/Diag

nosticReports/WindowServer_2016-12-22-104433_myhost.userspace_watchdog_timeout.s pin

Dec 29 10:10:51 myhost watchdogd[353]: [watchdog_daemon] @(__wd_service_report_unrespon

sive_block_invoke) - spindump gathered for (com.apple.WindowServer) at (/Library/Logs

/DiagnosticReports/WindowServer_2016-12-29-101051_myhost.userspace_watchdog_time out.spi

n)

Dec 29 10:10:53 myhost kernel[0]: stalling for detach from nvAccelerator

Dec 29 10:11:14 --- last message repeated 1 time ---

VirtualBox may be one trigger for this problem, but it certainly isn't the only one - since I never had VirtualBox while I get the same problem intermittently after the latest El Capitan security update. Moreover, I can go for several days after a restart before this problem occurs, so it may take considerable time to be sure if one has isolated a software trigger.

No virtualbox or any other VM running on my machine, but El Cap 10.11.6 and mid-2012 retina Problems started with last patch. I initially thought that a firefox plugin was causing the problem but finally had it reappear when firefox was not running. Will not appear for hours after a reboot as well. I do run Macports and Java 8 but the problems do not sem to have any relation to either of those. Typically the problem has appeared when I am running vanilla apps.

I've had this problem show up on two different Macs (Late 2012 iMac 27" and Mid 2012 15" MacBook Pro) in the last few days. Running El Cap 10.11.6, with the latest security patches. Same behaviour, Mac will stall and freeze every few seconds. Virtual Box was not installed on either.

Could you un-mark this as resolved?

I have the same problem with a Mac Mini (Late 2012) and an iMac (2016). in the first case the message is "stalling for detach from IntelAccelerator", in the second "stalling for detach from nvAccelerator".

The application typically running are: Mail, Safari, Console, iterm2, MacVim, Preview, Mathematica, LatexIt, Creative Cloud, Adobe Illustrator CC 2017.

The problem is more frequent when I start using computer after a period of inactivity.

If you do not remove the listing as resolved, the thread will have to be duplicated somewhere else.

OK, in order to provide a thread separate and apart from the Virtual Box issue, I have created a new thread (unsolved, lol) and provided a link both ways....

Latest ElCap upgrade hanging 10.11.6 - "Stalling for detach"

I've created a thread regarding this issue also, sans virtualbox.

AMD Graphics stalling on 3 Macs with latest El Capitan udpate