On startup, /etc/rc.d/tmp checks if /tmp is writable, and if not, creates a memory-disk filesystem for /tmp. Before actually creating, there's an additional check to see if /tmp is already a memory-disk, which returns false positive, if the root filesystem is a memory-disk! How-To-Repeat: Boot any setup with root_mfs read-only, and leave tmpmfs="AUTO". /etc/rc.d/tmp will recognize that /tmp is not writable, but refuses to create the memorydisk, because 'df' with '/tmp' and 'md[0-9]' as regex returns false positive.
Responsible Changed From-To: freebsd-bugs->hrs I'll take this.
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