VM hungs on random crng init done after reducing disk

I have vm with large disk (320Gb) and want to reduce it.
I booted VM from live cd and used gparted to reduce file system into vm. Now VM has 20Gb root fs and 300Gb unallocated.
Vm works.
Now I want to reduce logical volume in proxmox. I make
lvresize -L 300G /dev/iscsivg/vm-101-disk-1
And set virtio0: iscsivg:vm-101-disk-1,size=300G into VM config
VM stuck on random crng init done. It doesnt start.

I thoght grub and efi partitions were in the end of disk.
But fdisk show this:
...

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