F21 final RC2 - swap drive fail messages

[Robert Moskowitz]

Noticed a 'Fail' message flash across the screen during a boot, and so 
went looking in journalctl to find what it might have been. Supprise at 
what I did find.  After some filtering I have pulled out:

Dec 03 12:58:33 lx120e.htt-consult.com swapoff[1951]: swapoff: 
/dev/disk/by-uuid/732369cd-9f81-451e-800e-760bd8939df7: swapoff failed: 
Invalid argument
Dec 03 12:58:33 lx120e.htt-consult.com systemd[1]: 
dev-disk-by\x2duuid-732369cd\x2d9f81\x2d451e\x2d800e\x2d760bd8939df7.swap swap 
process exited, code=exited status=255
Dec 03 12:58:33 lx120e.htt-consult.com systemd[1]: Unit 
dev-disk-by\x2duuid-732369cd\x2d9f81\x2d451e\x2d800e\x2d760bd8939df7.swap entered 
failed state.
Dec 03 12:59:10 lx120e.htt-consult.com swapon[419]: swapon: /dev/sda4: 
swapon failed: Device or resource busy
Dec 03 12:59:10 lx120e.htt-consult.com kernel: Adding 8388604k swap on 
/dev/sda4.  Priority:-1 extents:1 across:8388604k SSFS
Dec 03 12:59:10 lx120e.htt-consult.com systemd[1]: dev-sda4.swap swap 
process exited, code=exited status=255
Dec 03 12:59:10 lx120e.htt-consult.com systemd[1]: Failed to activate 
swap Swap Partition.
Dec 03 12:59:10 lx120e.htt-consult.com systemd[1]: Unit dev-sda4.swap 
entered failed state.

What are these messages reporting?  Free shows I have swap space. Of 
course with 4Gb memory, I have not done enough on the system to get it 
to try and use swap space.