Bug#694513: udev appears to be part of the problem

[M Yudkowsky]

I noticed that udev consumed about 100% of (both) CPUs. 

udevadm monitor prints out an endless series of complaints:

KERNEL[142913.259475] add      /devices/virtual/bdi/254:7808 (bdi)
UDEV  [142913.260181] add      /devices/virtual/bdi/254:7808 (bdi)
KERNEL[142913.260389] add      /devices/virtual/block/md_d122 (block)
KERNEL[142913.260760] remove   /devices/virtual/bdi/254:7808 (bdi)
UDEV  [142913.260998] remove   /devices/virtual/bdi/254:7808 (bdi)
KERNEL[142913.261058] remove   /devices/virtual/block/md_d122 (block)
UDEV  [142913.264178] add      /devices/virtual/block/md_d122 (block)
UDEV  [142913.264692] remove   /devices/virtual/block/md_d122 (block)


restarting udev clears the problem, which then returns. I'm not clear what's going on here (is udev trying to restart something it thinks exists, or is it trying to grab devices that are in use?) and I'm investigating.