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Hi
I have just testet with 2.6.6rc3 without preemt but same problem

I have inserted also the dmesg output that i got that time, the last time this
message dissapeared to fast so now here the output

Cu Sergio

sandokan:/# cat /proc/bus/usb/devices

T: Bus=04 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 6
B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.06
S: Manufacturer=Linux 2.6.6-rc3 ehci_hcd
S: Product=Intel Corp. 82801DB USB2
S: SerialNumber=0000:00:1d.7
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=256ms

T: Bus=03 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.06
S: Manufacturer=Linux 2.6.6-rc3 uhci_hcd
S: Product=Intel Corp. 82801DB USB (Hub #3)
S: SerialNumber=0000:00:1d.2
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms

T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.06
S: Manufacturer=Linux 2.6.6-rc3 uhci_hcd
S: Product=Intel Corp. 82801DB USB (Hub #2)
S: SerialNumber=0000:00:1d.1
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms

T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 2.06
S: Manufacturer=Linux 2.6.6-rc3 uhci_hcd
S: Product=Intel Corp. 82801DB USB (Hub #1)
S: SerialNumber=0000:00:1d.0
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms


dmesg_output ->
usb 4-3: new high speed USB device using address 2
scsi0 : SCSI emulation for USB Mass Storage devices
Vendor: HL-DT-ST Model: DVDRAM GSA-4081B Rev: A100
Type: CD-ROM ANSI SCSI revision: 02
USB Mass Storage device found at 2
sr0: scsi3-mmc drive: 32x/32x writer dvd-ram cd/rw xa/form2 cdda tray
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0
Hangcheck: hangcheck value past margin!
Attached scsi generic sg0 at scsi0, channel 0, id 0, lun 0, type 5
scsi: Device offlined - not ready after error recovery: host 0 channel 0 id 0
lun 0
usb 4-3: USB disconnect, address 2
sr 0:0:0:0: Illegal state transition offline->cancel
Badness in scsi_device_set_state at drivers/scsi/scsi_lib.c:1640
Call Trace:
[<e1a887e0>] scsi_device_set_state+0xc0/0x110 [scsi_mod]
[<e1a83d18>] scsi_device_cancel+0x28/0xfb [scsi_mod]
[<e1a83e30>] scsi_device_cancel_cb+0x0/0x20 [scsi_mod]
[<c020973d>] device_for_each_child+0x3d/0x70
[<e1a83e82>] scsi_host_cancel+0x32/0xa0 [scsi_mod]
[<e1a83e30>] scsi_device_cancel_cb+0x0/0x20 [scsi_mod]
[<e1936412>] usb_buffer_free+0x52/0x60 [usbcore]
[<e1a83f09>]