Comment 7 for bug 105490

Same problem here. The UUID in fstab didn't match the one in /dev/disk/by-uuid/. This started after a sleep/wake cycle. Had to fix it by hand by editing fstab to use the correct value from /dev/disk/by-uuid. swapon -a was reporting:
% sudo swapon -a
swapon: cannot stat /dev/disk/by-uuid/15ed6769-566c-4228-bb35-d9a0131dc42c: No such file or directory

There was nothing relevant in the dmesg output.

This is pretty serious - when the swap was missing, I was seeing the machine running very, very slowly.