During July 2025, Zhijie Zuo focused on enhancing the stability of the virtio-net driver within the geerlingguy/linux repository. He addressed a complex deadlock issue during the driver probe by replacing a recursive configuration change trigger with virtio_config_changed, effectively preventing recursive locking and reducing race conditions when the virtual machine monitor announces changes. Working primarily in C, Zhijie applied his expertise in device drivers, kernel development, and networking to improve the reliability of virtualization networking. His targeted bug fix was validated in KVM environments, demonstrating a deep understanding of kernel synchronization and contributing to overall system stability and maintainability.