VMware Engineer Confirms macOS Catalina 10.15.6 Bug Causes Crashes with Virtualization

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

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.

Tags: macOS, VMware

Top Rated Comments

dguisinger Avatar
49 months ago
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.
Score: 35 Votes (Like | Disagree)
saudor Avatar
49 months ago
Still on Mojave. Everything rock stable. Large transfers? OK! VMware? Rock Stable. 32 bit/legacy? Hell yeah. Web browsers? works all the time.
Score: 26 Votes (Like | Disagree)
biziclop Avatar
49 months ago
 is just preparing people for the  Silicon future.
Score: 22 Votes (Like | Disagree)
MRrainer Avatar
49 months ago
Good thing I decided to stay on Mojave then.
Score: 21 Votes (Like | Disagree)
ArtOfWarfare Avatar
49 months ago

Question for Mac users, since Catalina has been famously buggy, what's there last best stable MacOS version?
Snow Leopard. Every MacRumors user's favorite $29 update to macOS.
Score: 15 Votes (Like | Disagree)
SaxPlayer Avatar
49 months ago
Parallels Desktop is running fine under Catalina 10.15.6 with an MS Windows VM.
Score: 10 Votes (Like | Disagree)

Popular Stories

Provenance Emulator

PlayStation, GameCube, Wii, and SEGA Emulator for iPhone and Apple TV Coming to App Store

Friday April 19, 2024 8:29 am PDT by
The lead developer of the multi-emulator app Provenance has told iMore that his team is working towards releasing the app on the App Store, but he did not provide a timeframe. Provenance is a frontend for many existing emulators, and it would allow iPhone and Apple TV users to emulate games released for a wide variety of classic game consoles, including the original PlayStation, GameCube, Wii,...
iPhone 15 Pro FineWoven

Apple Reportedly Stops Production of FineWoven Accessories

Sunday April 21, 2024 6:03 am PDT by
Apple has stopped production of FineWoven accessories, according to the Apple leaker and prototype collector known as "Kosutami." In a post on X (formerly Twitter), Kosutami explained that Apple has stopped production of FineWoven accessories due to its poor durability. The company may move to another non-leather material for its premium accessories in the future. Kosutami has revealed...
iOS 17 All New Features Thumb

iOS 17.5 Will Add These New Features to Your iPhone

Sunday April 21, 2024 3:00 am PDT by
The upcoming iOS 17.5 update for the iPhone includes only a few new user-facing features, but hidden code changes reveal some additional possibilities. Below, we have recapped everything new in the iOS 17.5 and iPadOS 17.5 beta so far. Web Distribution Starting with the second beta of iOS 17.5, eligible developers are able to distribute their iOS apps to iPhone users located in the EU...
Delta Feature

Delta Game Emulator Now Available From App Store on iPhone

Wednesday April 17, 2024 9:58 am PDT by
Game emulator apps have come and gone since Apple announced App Store support for them on April 5, but now popular game emulator Delta from developer Riley Testut is available for download. Testut is known as the developer behind GBA4iOS, an open-source emulator that was available for a brief time more than a decade ago. GBA4iOS led to Delta, an emulator that has been available outside of...