On 24.05.19 13:11, Christian Borntraeger wrote: > I do get > > [10400.440298] kvm-s390: failed to commit memory region > [10400.508723] kvm-s390: failed to commit memory region > > when running the tests. Will have a look. It comes from kvm_vm_free. This calls KVM_SET_USER_MEMORY_REGION with size 0, which the s390 code does not like.