update-grub -> cat: /sys/block/mapper/vg_raid10_bitmap-root/dm/uuid: No such file or directory (grub2-2.02-0.beta2.1.i686)

[Mateusz Korniak]

With root FS on LVM over raid10 [1]: newest grub2 fails to me:

# update-grub                                                                                                                                                                                                                                      
/sbin/grub-mkconfig[153]: cat: /sys/block/mapper/vg_raid10_bitmap-root/dm/uuid: 
No such file or directory

It's from:

# sh -x /sbin/grub-mkconfig -o /boot/grub/grub.cfg

fails with:

+ /sbin/grub-probe '--target=device' /
+ GRUB_DEVICE=/dev/mapper/vg_raid10_bitmap-root 
+ readlink -f /dev/mapper/vg_raid10_bitmap-root
+ DM_REAL_DEVICE=/dev/mapper/vg_raid10_bitmap-root 
+ cat /sys/block/mapper/vg_raid10_bitmap-root/dm/uuid
/sbin/grub-mkconfig[153]: cat: /sys/block/mapper/vg_raid10_bitmap-root/dm/uuid: 
No such file or directory
+ DM_UUID= 


Any hints?
TIA 


[1]: mount:
/dev/mapper/vg_raid10_bitmap-root on / type ext4 
(rw,relatime,stripe=256,data=ordered)


-- 
Mateusz Korniak
"(...) mam brata - poważny, domator, liczykrupa, hipokryta, pobożniś,
 	krótko mówiąc - podpora społeczeństwa."
				Nikos Kazantzakis - "Grek Zorba"