Comment 2 for bug 438858

udev monitor log :

KERNEL[1254249561.664331] add /devices/pci0000:00/0000:00:06.1/usb2/2-2 (usb)
KERNEL[1254249561.665177] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.0 (usb)
KERNEL[1254249561.665226] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.1 (usb)
KERNEL[1254249561.665262] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2 (usb)
KERNEL[1254249561.665696] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10 (scsi)
KERNEL[1254249561.665733] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/scsi_host/host10 (scsi_host)
UDEV [1254249561.674319] add /devices/pci0000:00/0000:00:06.1/usb2/2-2 (usb)
UDEV [1254249561.684790] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2 (usb)
UDEV [1254249561.693737] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.0 (usb)
UDEV [1254249561.704217] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10 (scsi)
UDEV [1254249561.705026] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/scsi_host/host10 (scsi_host)
UDEV [1254249561.708861] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.1 (usb)
KERNEL[1254249566.674079] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0 (scsi)
KERNEL[1254249566.674134] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0/10:0:0:0 (scsi)
KERNEL[1254249566.674165] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0/10:0:0:0/scsi_disk/10:0:0:0 (scsi_disk)
KERNEL[1254249566.674195] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0/10:0:0:0/scsi_device/10:0:0:0 (scsi_device)
KERNEL[1254249566.674288] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0/10:0:0:0/scsi_generic/sg2 (scsi_generic)
UDEV [1254249566.674739] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0 (scsi)
UDEV [1254249566.675276] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0/10:0:0:0 (scsi)
UDEV [1254249566.675910] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0/10:0:0:0/scsi_device/10:0:0:0 (scsi_device)
UDEV [1254249566.676917] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0/10:0:0:0/scsi_generic/sg2 (scsi_generic)
KERNEL[1254249566.679598] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0/10:0:0:0/block/sdb (block)
UDEV [1254249566.682642] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0/10:0:0:0/scsi_disk/10:0:0:0 (scsi_disk)
KERNEL[1254249566.682811] add /devices/virtual/bdi/8:16 (bdi)
UDEV [1254249566.683080] add /devices/virtual/bdi/8:16 (bdi)
UDEV [1254249567.872219] add /devices/pci0000:00/0000:00:06.1/usb2/2-2/2-2:1.2/host10/target10:0:0/10:0:0:0/block/sdb (block)