rdsosreport file is attached

If I boot to the 4.0.6_1 recovery image, I see the following (extracted 
from the rdsosreport file) but I might be missing more relevant messages 
(not really sure what to look for)

+ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.0.6_1 
root=UUID=a203ee45-7e82-4d30-a7a8-61e60202a10d ro single

+ ls -l '/dev/disk/by*'
ls: cannot access /dev/disk/by*: No such file or directory

There's a long delay from 2.8 seconds to 50.2 seconds
[    2.836639] Switched to clocksource tsc
[   50.252272] usb 4-1: USB disconnect, device number 2

and another one
[   51.934966] hid-generic 0003:046D:C05A.0004: input,hidraw0: USB HID 
v1.11 Mouse [Logitech USB Optical Mouse] on usb-0000:00:12.0-1/input0
[   99.916444] usb 4-1: USB disconnect, device number 4

then this message
[  187.378211] dracut Warning: Could not boot.
[  187.380844] dracut Warning: 
/dev/disk/by-uuid/a203ee45-7e82-4d30-a7a8-61e60202a10d does not exist
+ '[' -f /run/initramfs/init.log ']'

And I'm dropped to a dracut shell

Any ideas?  Like I said in the subject line, 4.0.5_2 works as expectedly 
but I ran an 'xbps-install -Su' today and couldn't boot afterwards