udev error on boot screen

[Gio]

Binary package hint: udev

udev-work[148]: inotify_add_watch(6, /dev/dm-1, 10) failed: No such file or directory
This is the error, then Ubuntu boot correctly.

I am on 2 500GB HD fake RAID0 on an ASUS M4A88T-M/USB3.

I've also noticed that if I do a benchmark from the disk utility on the raid system (tested twice) then the system will fail to boot and keep on reloading the bios, as there is no bootable disk.

Thank you.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: udev 162-2.2
ProcVersionSignature: Ubuntu 2.6.35-28.49-generic 2.6.35.11
Uname: Linux 2.6.35-28-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Tue Mar 22 14:12:03 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
MachineType: System manufacturer System Product Name
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-28-generic root=UUID=7050cf7f-3766-4709-b596-b719ba5f0f92 ro quiet splash
ProcEnviron:
 LANG=it_IT.utf8
 SHELL=/bin/bash
SourcePackage: udev
dmi.bios.date: 12/23/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0703
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A88T-M/USB3
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0703:bd12/23/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A88T-M/USB3:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer