This bug is caused by /lib/udev/rules.d/69-bcache.rules (from bcache-tools) grabbing all block devices where ID_FS_TYPE=bcache, including the disks backing the multipath device. Latter when multipathd daemon comes up and tries to initialize the mpath devices, it fails because those disks are already in use.
This bug is caused by /lib/udev/ rules.d/ 69-bcache. rules (from bcache-tools) grabbing all block devices where ID_FS_TYPE=bcache, including the disks backing the multipath device. Latter when multipathd daemon comes up and tries to initialize the mpath devices, it fails because those disks are already in use.