Version

7.1.0

Host OS Type

Linux

Host OS name + version

debian 12

Host Architecture

x86

Guest OS Type

Linux

Guest Architecture

x86

Guest OS name + version

debian 12

Component

VBoxManage CLI

What happened?

lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookworm

uname -r
6.1.0-37-amd64

vboxmanage --version
7.1.10r169112

I created a script to generate 100 minimal VMs.
When I try to start them one by one, the situation is always the same:

VM "loadtest-060" has been successfully started. [*] Starting loadtest-061 Waiting for VM "loadtest-061" to power on... VM "loadtest-061" has been successfully started. [*] Starting loadtest-062 Waiting for VM "loadtest-062" to power on... VBoxManage: error: The virtual machine 'loadtest-062' has terminated unexpectedly during startup with exit code 1 (0x1) VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component MachineWrap, interface IMachine [*] Starting loadtest-063 Waiting for VM "loadtest-063" to power on... VBoxManage: error: The virtual machine 'loadtest-063' has terminated unexpectedly during startup with exit code 1 (0x1) VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component MachineWrap, interface IMachine

If I stop loadtest-061, then I can start loadtest-062 without issues.
But I cannot run more than 61 VMs simultaneously. Any attempt to go beyond that results in the VM failing to start with the same error.

I tryed this test on different server with Deb 11 and different vms config, adjusted the ulimits, result the same
Afected versions only above 7.1+, with 7.0.x everything is fine can start 100+ vms without any issues

How can we reproduce this?

I created post on forum
https://forums.virtualbox.org/viewtopic.php?t=113816
download the scripts
setup the Variables
run...

if you need additional information let me know, I have my test env ready

Did you upload all of your necessary log files, screenshots, etc.?

• Yes, I've uploaded all pertinent files to this issue.