The behaviour of lxd vms in lack of resources

What is the behaviour of lxd virtual machines in lack of resources?

For my lxd instances i encounter stopping vms.

If your host runs out of memory because of virtual machines resources, then the kernel out of memory killer will be invoked. This usually results in some of the VMs getting killed by the kernel.

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Thank you @stgraber
My problem was the below issue:
processes freeze

I could solve by these commands:
sudo apt install linux-generic
sudo apt remove linux-image-5.4.0-1032-kvm
sudo update-grub