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