i'm not quite sure why this happens, but the quick fix is to remount
/proc.
if mount -w -n -o remount /proc doesn't work, umount it and remount it.
'tis always fixed this rarity for me.
-d
-- to include colors and other non printing characters in a bash prompt, surround the non printing characters with \[ and \] and bash will correctly calculate the line length.
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