Description of problem:
Having two swap partitions on two disk drives, systemd activate them, but repeatedly tried activate one, generate lot of error log messages, and boot take a long time. Note 'dev-sdb3.swap   loaded failed failed    /dev/sdb3' in listing below:
# systemctl --full --all --type=swap
UNIT                                                                               LOAD   ACTIVE   SUB    JOB   DESCRIPTION
dev-disk-by\x2did-ata\x2dWDC_WD1502FAEX\x2d007BA0_WD\x2dWMAY02707524\x2dpart3.swap loaded active   active       /dev/disk/by-id/ata-WDC_WD1502FAEX-007BA0_WD-WMAY02707524-part3
dev-disk-by\x2did-ata\x2dWDC_WD1502FAEX\x2d007BA0_WD\x2dWMAY03109541\x2dpart3.swap loaded inactive dead   start /dev/disk/by-id/ata-WDC_WD1502FAEX-007BA0_WD-WMAY03109541-part3
dev-disk-by\x2did-wwn\x2d0x50014ee0584b373e\x2dpart3.swap                          loaded inactive dead   start /dev/disk/by-id/wwn-0x50014ee0584b373e-part3
dev-disk-by\x2did-wwn\x2d0x50014ee6ac15a17d\x2dpart3.swap                          loaded active   active       /dev/disk/by-id/wwn-0x50014ee6ac15a17d-part3
dev-disk-by\x2dlabel-swap\x2da.swap                                                loaded active   active       /dev/disk/by-label/swap-a
dev-disk-by\x2dlabel-swap\x2db.swap                                                loaded inactive dead   start /dev/disk/by-label/swap-b
dev-disk-by\x2dpartlabel-Linux\x5cx20swap.swap                                     loaded active   active       /dev/disk/by-partlabel/Linux\x20swap
dev-disk-by\x2dpartuuid-3413bdb8\x2d3333\x2d46a7\x2dacac\x2dcdc78cfeba5c.swap      loaded inactive dead   start /dev/disk/by-partuuid/3413bdb8-3333-46a7-acac-cdc78cfeba5c
dev-disk-by\x2dpartuuid-73029b39\x2dcf4d\x2d400b\x2d909d\x2d9febb281f679.swap      loaded active   active       /dev/disk/by-partuuid/73029b39-cf4d-400b-909d-9febb281f679
dev-disk-by\x2duuid-299ca22b\x2d5ac3\x2d413e\x2d8111\x2d6f9c2af1a3c1.swap          loaded active   active       /dev/disk/by-uuid/299ca22b-5ac3-413e-8111-6f9c2af1a3c1
dev-disk-by\x2duuid-2fea3af7\x2da27b\x2d4686\x2d934e\x2dacf4c1830642.swap          loaded active   active       /dev/disk/by-uuid/2fea3af7-a27b-4686-934e-acf4c1830642
dev-sda3.swap                                                                      loaded active   active       /dev/sda3
dev-sdb3.swap                                                                      loaded failed   failed       /dev/sdb3

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.
JOB    = Pending job for the unit.

13 loaded units listed.


# blkid|grep swap
/dev/sda3: UUID="9cb870b2-b5fa-46b5-b5b1-a2aa01b1216a" TYPE="swap" PARTLABEL="Linux swap" PARTUUID="adf83831-8528-44e8-a7f0-7b3109cfcbb8" 
/dev/sdb3: UUID="f41213ac-da73-459f-b2e7-0f356305b8b1" TYPE="swap" PARTLABEL="Linux swap" PARTUUID="adf83831-8528-44e8-a7f0-7b3109cfcbb8" 

# LANG=C swapon -s -v
Filename                   Type            Size    Used    Priority
/dev/sdb3                  partition       3145724 1564    -1
/dev/sda3                  partition       3145724 0       -2

# grep swap /etc/fstab
UUID=299ca22b-5ac3-413e-8111-6f9c2af1a3c1 swap  swap   defaults   0 0
UUID=2fea3af7-a27b-4686-934e-acf4c1830642 swap  swap   defaults   0 0


Version-Release number of selected component (if applicable):
systemd-201-2.fc18.7.i686
systemd-204-9.fc19.i686

How reproducible:
I tried this on three different PCs, on all of them are same this bad behavior.