I see these warnings in my /var/log/messages for blockdev on my /virtual/loop(x) : May 26 19:11:38 localhost hald[2316]: 19:11:38.481 [I] blockdev.c:874: block_add: sysfs_path=/sys/devices/virtual/block/loop0 dev=/dev/loop0 is_part=0, parent=0x00000000 May 26 19:11:38 localhost hald[2316]: 19:11:38.481 [I] blockdev.c:915: Looking in /sys/devices/virtual/block/loop0/slaves for Device Mapper May 26 19:11:38 localhost hald[2316]: 19:11:38.481 [I] blockdev.c:926: /sys/devices/virtual/block/loop0/slaves/. -> /sys/devices/virtual/block/loop0/slaves May 26 19:11:38 localhost hald[2316]: 19:11:38.481 [I] blockdev.c:958: Couldn't find slave volume in devices May 26 19:11:38 localhost hald[2316]: 19:11:38.481 [I] blockdev.c:926: /sys/devices/virtual/block/loop0/slaves/.. -> /sys/devices/virtual/block/loop0 May 26 19:11:38 localhost hald[2316]: 19:11:38.481 [I] blockdev.c:958: Couldn't find slave volume in devices May 26 19:11:38 localhost hald[2316]: 19:11:38.481 [I] blockdev.c:964: Done looking in /sys/devices/virtual/block/loop0/slaves May 26 19:11:38 localhost hald[2316]: 19:11:38.481 [I] blockdev.c:970: Ignoring hotplug event - no parent May 26 19:11:38 localhost hald[2316]: 19:11:38.481 [W] blockdev.c:1473: Not adding device object Reproducible: Always
Caused by blockdev not being there. Expected if you arent using the functionality.