Cannot start VM with error: "virtual machine's network attachment has been disconnected"

[Lutzifer]

After creating a VM using

tart create --from-ipsw=latest monterey-vanilla

starting it using

tart run monterey-vanilla  

fails with the error

"virtual machine's network attachment has been disconnected"

Guest: 21E258.ipsw
Host: 12.3.1 (21E258), MacBook Pro (16-inch, 2021), Apple M1 Max

[edigaryev]

Hello, thanks for checking out the fix provided in #74 so quickly!

Unfortunately I've never stumbled upon this on a a similar configuration (MacBookPro18,3 and 21E258 for both host and guests). However, assuming that you have essentially a pristine guest OS, do you run some other virtualization/networking software on your host by a chance?

Can you check if #77 works for you and does not cause a lot of re-attachments?

[Lutzifer]

#77 causes an infinite loop of re-attachments, but I can setup the OS then (without network)

I have UTM installed, but it is not running atm.

I cannot see, what VZNATNetworkDeviceAttachment is using under the hood, but the only available device for VZBridgedNetworkInterface is my wifi.

[Lutzifer]

It works if I use an USB Dongle to connect to LAN.

[edigaryev]

#77 causes an infinite loop of re-attachments, but I can setup the OS then (without network)

Thanks for checking this! Looks like adding the re-attachment logic would do nothing useful to fix the issue as the error cause doesn't seem to be intermittent.

I cannot see, what VZNATNetworkDeviceAttachment is using under the hood, but the only available device for VZBridgedNetworkInterface is my wifi.

It's using vmnet under the hood most likely. This API manifests itself in ifconfig output as vmenetX interfaces connected to bridge100 normally.

[edigaryev]

@Lutzifer could you also check the #80 please? Does the network work with it?

It ignores all errors with the assumption that the Virtualization.Framework may re-connect the attachment itself.

[Lutzifer]

network does not work with #80

I can see vmenetX appear when I run tart, but do not see bridge100

Would be interesting to test this against another MacBookPro18,3 to see if it is only a config issue on my side.
Will also try later today when I have upgraded to macOS 12.4 to see if this changes anything.

[fkorotkov]

@Lutzifer I'm on MacBookPro18,3 (14" M1 Max with 2 TB) so this is very interesting to see what's the difference. Have you tried cloning an existing VM? The vanilla one I built and pushed from my machine:

tart clone ghcr.io/cirruslabs/macos-monterey-vanilla:12.4 test
tart run test

[Lutzifer]

Ok, I found the source of the problem:

I had enabled both internet sharing and air play receiver in the sharing settings.
After disabling both of them, it worked. My guess: Internet Sharing was enabled with a port that was no longer available (USB-Ethernet Dongle) and kept the NAT Service busy.

Thanks for all the help!

[fkorotkov]

Wow. Glad you found the issue!