I looked at this some more, and the issue appears to be a symptom of /proc/mounts listing /dev/root as the root dev, but no /dev/root exists on this system. Turns out this system is running a static kernel and did not boot with an initramfs.
I looked at this some more, and the issue appears to be a symptom of /proc/mounts listing /dev/root as the root dev, but no /dev/root exists on this system. Turns out this system is running a static kernel and did not boot with an initramfs.