Why virt-sysprep is failing with error "inspect_os: fork: : Cannot allocate memory"

Issue

• virt-sysprep execution is failing with the error below.

ocaml_exn: 'inspect_os' raised 'Unix.Unix_error' exception
guestfsd: error: fork: : Cannot allocate memory
libguestfs: trace: inspect_os = NULL (error)
virt-sysprep: error: libguestfs error: inspect_os: fork: : Cannot allocate
memory
libguestfs: trace: close
libguestfs: closing guestfs handle 0x564e10bd30b0 (state 2)