The regression was introduced with the latest security updates released last week for Ubuntu 20.04 LTS (Focal Fossa), as well as Ubuntu 19.10 and 18.04.4 LTS. The regression affected Linux kernel’s OverlayFS file system implementation causing the Docker registry to keep restarting. Affected kernels are Linux 5.4 (generic, generic-lpae, lowlatency, oem and virtual flavors) in Ubuntu 20.04 LTS 64-bit installations and Linux 5.3 (generic, generic-lpae, lowlatency, raspi2 and snapdragon flavors) in Ubuntu 19.10 and Ubuntu 18.04.4 LTS 32-bit, 64-bit and ARM (Raspberry Pi (V7)) systems.