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The VMStateDescription of Migratable<T> missed the name field, and this casused segmentation fault in vmstate_save_state_v() when it tries to write name field by json_writer_str(). Due to the limitation of const, a custom name based on type would be more difficult. Instead, a straightforward and simple approach is to have all Migratable<T> instances use the same VMSD name - "migratable-wrapper". This is availiable because Migratable<T> is always a field within a VMSD, and its parent VMSD should have a distinct name. Signed-off-by: Zhao Liu <zhao1.liu@intel.com> Link: https://lore.kernel.org/r/20251113051937.4017675-3-zhao1.liu@intel.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>