USB drive not mounted after reboot

Just did another reboot (for 6.1.2) so I have some new information about this.

1) After rebooting, doing nothing else, there is NO setup_usb_storage file in /run and the USB3 drive is connected but NOT mounted

2) the usb_devices.log contains:

1-0:1.0
2-0:1.0
3-0:1.0
4-0:1.0
4-2 idProduct=50a5 idVendor=0bc2 devnum=2 speed=5000
4-2:1.0

3) the dmesg.log has these lines that seem relevant to the USB device:


[Thu Sep 12 22:31:53 2013] usb 4-2: new SuperSpeed USB device number 2 using xhci_hcd
[Thu Sep 12 22:31:53 2013] scsi4 : usb-storage 4-2:1.0

... then the SATA disks are discovered and raids come up etc ...

[Thu Sep 12 22:31:53 2013] usb 4-2: reset SuperSpeed USB device number 2 using xhci_hcd
[Thu Sep 12 22:31:53 2013] xhci_hcd 0000:01:01.0: xHCI xhci_drop_endpoint called with disabled ep c3058ae0
[Thu Sep 12 22:31:53 2013] xhci_hcd 0000:01:01.0: xHCI xhci_drop_endpoint called with disabled ep c3058b0c
[Thu Sep 12 22:31:53 2013] usb 4-2: reset SuperSpeed USB device number 2 using xhci_hcd
[Thu Sep 12 22:31:53 2013] xhci_hcd 0000:01:01.0: xHCI xhci_drop_endpoint called with disabled ep c3058ae0
[Thu Sep 12 22:31:53 2013] xhci_hcd 0000:01:01.0: xHCI xhci_drop_endpoint called with disabled ep c3058b0c
[Thu Sep 12 22:31:53 2013] usb 4-2: reset SuperSpeed USB device number 2 using xhci_hcd
[Thu Sep 12 22:31:53 2013] xhci_hcd 0000:01:01.0: xHCI xhci_drop_endpoint called with disabled ep c3058ae0
[Thu Sep 12 22:31:53 2013] xhci_hcd 0000:01:01.0: xHCI xhci_drop_endpoint called with disabled ep c3058b0c
[Thu Sep 12 22:31:53 2013] usb 4-2: reset SuperSpeed USB device number 2 using xhci_hcd
[Thu Sep 12 22:31:53 2013] xhci_hcd 0000:01:01.0: xHCI xhci_drop_endpoint called with disabled ep c3058ae0
[Thu Sep 12 22:31:53 2013] xhci_hcd 0000:01:01.0: xHCI xhci_drop_endpoint called with disabled ep c3058b0c


Then, after I unplug and replug the USB3 cable, it is discovered and mounted as last time.

I have captured a full set of logfiles from after the reboot but before replugging, so let me know if there would be anything else interesting to look for.