Bug#969489: systemd: systemctl can hang up waiting for device nodes that are already mounted

[Joshua Hudson]

brw-rw---- 1 root disk 254, 2 Sep  3 14:51 /dev/mapper/isw_cfbejbfeib_Volume12

udevadm command output attached.

The device isn't dead. It works when accessed directly by name.

$ /sbin/swapon
NAME                                TYPE      SIZE USED PRIO
/dev/mapper/isw_cfbejbfeib_Volume12 partition  32G   0B   -2
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