Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

MacRumors

macrumors bot
Original poster
Apr 12, 2001
57,441
20,273


macOS Catalina 10.15.6 seems to have introduced a bug that causes system crashes, especially when using virtualization software such as VirtualBox or VMware.

vmware_logo.png


Users of virtualization software have reported that macOS 10.15.6 crashes repeatedly when running virtual machines.

A regression in the App Sandbox component of macOS 10.15.6 is reportedly leaking kernel memory, causing macOS to crash. The purpose of an App Sandbox is to provide protection to system resources and limit an app's access to resources, such as memory.

VMware engineers have today diagnosed the issue and filed a "comprehensive" report with Apple, including a minimal reproduction case which should allow them to easily identify and address the issue. The engineer cautions that "it isn't looking good" going forwards, and it will likely fall to Apple to resolve the issue in a software update to macOS. It is unclear if this issue exists in developer and public betas of macOS Big Sur.

The workaround suggested by many users and VMware engineers is to refrain from installing macOS 10.15.6, or shutting down virtual machines when they are not in use and rebooting the host as often as possible.

Article Link: VMware Engineer Confirms macOS Catalina 10.15.6 Bug Causes Crashes with Virtualization
 
  • Like
Reactions: DeepIn2U

dguisinger

macrumors 65816
Jul 25, 2002
1,062
2,090
Oh Catalina .... even in your final builds you can't give up your reputation....

I really hope the reason for all of the crashes I get on a regular basis coming in and out of sleep, as well as my other reliability issues is because they had their A-team working on the massive Big Sur release for the past few years.... because Catalina has been a terrible experience.
 
Last edited:

dguisinger

macrumors 65816
Jul 25, 2002
1,062
2,090
I've had a few crashes since installing this update and I am using virtual machines so I'm glad this bug has been found. Hope Apple fixes it quickly.

I don't know, I haven't felt like they cared about Catalina outside of security issues.

I mean, I know for a fact I'm not the only one who crosses their fingers when they come out of sleep mode as to whether their mac will spontaneously reboot

And I know I'm not the only one who has complained for a year that my Mac launches every application I've opened in my lifetime on reboot - not just the ones I had open when I shut down, which is what the feature is supposed to do.

I still say shown past performance, they won't fix anything that people actually care about. If I hadn't seen Big Sur or the whole Apple Silicon announcement, I would have taken the lack of fixes in Catalina builds to be more proof that they don't care about the Mac anymore....
 

Lahmy88

macrumors member
May 14, 2011
99
19
Shepparton, Victoria, Australia
Has anyone heard whether Apple Silicon Macs will run a Windows x86-64 VM on VirtualBox or Parallels?

I probably haven’t looked hard enough on the ‘net but I assume someone with a Developer Transition Kit has tested this?
 
  • Like
Reactions: sjinsjca

Kabeyun

macrumors 68040
Mar 27, 2004
3,272
6,100
Eastern USA
Has anyone heard whether Apple Silicon Macs will run a Windows x86-64 VM on VirtualBox or Parallels?

I probably haven’t looked hard enough on the ‘net but I assume someone with a Developer Transition Kit has tested this?
Windows 10 ARM will happen but that’s all I read. Actually, I also heard that Federighi our Boot Camp out to pasture but was open to virtualization in general.

edit: just found this vague-but-encouraging statement.
 
Last edited:

fahlman

macrumors regular
Sep 12, 2003
105
48
I mean, I know for a fact I'm not the only one who crosses their fingers when they come out of sleep mode as to whether their mac will spontaneously reboot

And I know I'm not the only one who has complained for a year that my Mac launches every application I've opened in my lifetime on reboot - not just the ones I had open when I shut down, which is what the feature is supposed to do.

I am not denying that you are experiencing these problems, but I work at a fairly large university supporting hundreds of Macs and have not had a single user complain about either of these problems.
 

ethanwa79

macrumors 6502
Sep 13, 2014
250
906
Has anyone heard whether Apple Silicon Macs will run a Windows x86-64 VM on VirtualBox or Parallels?

I probably haven’t looked hard enough on the ‘net but I assume someone with a Developer Transition Kit has tested this?

No, they will not.
 

chrfr

macrumors G4
Jul 11, 2009
11,833
5,366
Has anyone heard whether Apple Silicon Macs will run a Windows x86-64 VM on VirtualBox or Parallels?

I probably haven’t looked hard enough on the ‘net but I assume someone with a Developer Transition Kit has tested this?
There's been extensive discussion of this topic on this forum. None of the existing virtualization tools will enable running Intel operating systems on Apple Silicon.
 

ducknalddon

macrumors regular
Aug 31, 2018
206
298
It’s interesting that VMWare feel the need to publish this publicly rather than go through the normal channels. Do they feel it won’t get fixed without the external attention?
 
  • Like
Reactions: BurgDog

LV426

macrumors 68000
Jan 22, 2013
1,570
1,657
I've had - what I presume is - this issue about 4 times in the past couple of weeks. My symptoms: VM becomes unresponsive, cursor still moves around but no menus appear to work. After a short while, the video display turns into a nasty pixellated mess. Nice!

Oh well, at least it's a known issue now and hopefully a fix will be in the pipeline at some point.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.