disconnect on one usb2.0 port corrupts the communication on the other

Hi
Today i notices a strange USB hang on my opensuse 10.3 installation.

"a disconnect on one usb2.0 port corrupts communication on the other"

How to reproduce:

1.	connect 2 memory -sticks
2a.	start dd if=<device_stick_1> of=/dev/null
2b.	during the transfer, remove stick 2.
immediately after removal the data transfer to the first
stick halts

tried with different linux-versions (2.6.22, 2.6.21 and 2.6.13) and
different motherboards.
(intel 855 /845  and AMD based) with  same result.
on some systems it is necessary to use a usb-cable extender (on the "unplug" stick)
to reproduce the problem,so i think the reason is an unhandled error in
the ehci-stack. After enabling USB_DEBUG I noticed an an XActErr in the current transfer
descriptor.

switching the ports to USB 1.1 (through bios or /sys/class/usb_hub/usb_hub/companion)
avoids the error, but is not satisfying solution.

Does anyone know of this error and/or of an available fix /patch /workarounds?
-
Heribert

problem  opensuse 10.3 (and all tested older versions)

cpu:	Celeron 2.0 		Intel 845 
	Celeron 1.5-mobile	Intel 855 
	AMD Geode 500	AMD chipset	

I attached a sample syslog protocol.
the victim is the Memory stick 128 MB on sdb.

Oct 17 23:05:19 000c6e7eddc5 kernel: usb 4-4.2: new high speed USB device using ehci_hcd and address 5
Oct 17 23:05:19 000c6e7eddc5 kernel: usb 4-4.2: new device found, idVendor=090c, idProduct=1000
Oct 17 23:05:19 000c6e7eddc5 kernel: usb 4-4.2: new device strings: Mfr=1, Product=2, SerialNumber=3
Oct 17 23:05:19 000c6e7eddc5 kernel: usb 4-4.2: Product: USB 2.0 Flash Drive
Oct 17 23:05:19 000c6e7eddc5 kernel: usb 4-4.2: Manufacturer: Super Talent Flash
Oct 17 23:05:19 000c6e7eddc5 kernel: usb 4-4.2: SerialNumber: 32000000000000000882
Oct 17 23:05:19 000c6e7eddc5 kernel: usb 4-4.2: configuration #1 chosen from 1 choice
Oct 17 23:05:19 000c6e7eddc5 kernel: scsi4 : SCSI emulation for USB Mass Storage devices
Oct 17 23:05:19 000c6e7eddc5 kernel: usb-storage: device found at 5
Oct 17 23:05:19 000c6e7eddc5 kernel: usb-storage: waiting for device to settle before scanning
Oct 17 23:05:20 000c6e7eddc5 kernel: scsi 4:0:0:0: Direct-Access     Flash/SM Super Talent 2.0 2040 PQ: 0 ANSI: 0 CCS
Oct 17 23:05:20 000c6e7eddc5 kernel: sd 4:0:0:0: [sdb] 252928 512-byte hardware sectors (129 MB)
Oct 17 23:05:20 000c6e7eddc5 kernel: sd 4:0:0:0: [sdb] Write Protect is off
Oct 17 23:05:20 000c6e7eddc5 kernel: sd 4:0:0:0: [sdb] Mode Sense: 43 00 00 00
Oct 17 23:05:20 000c6e7eddc5 kernel: sd 4:0:0:0: [sdb] Assuming drive cache: write through
Oct 17 23:05:20 000c6e7eddc5 kernel: sd 4:0:0:0: [sdb] 252928 512-byte hardware sectors (129 MB)
Oct 17 23:05:20 000c6e7eddc5 kernel: sd 4:0:0:0: [sdb] Write Protect is off
Oct 17 23:05:20 000c6e7eddc5 kernel: sd 4:0:0:0: [sdb] Mode Sense: 43 00 00 00
Oct 17 23:05:20 000c6e7eddc5 kernel: sd 4:0:0:0: [sdb] Assuming drive cache: write through
Oct 17 23:05:20 000c6e7eddc5 kernel:  sdb: sdb1
Oct 17 23:05:20 000c6e7eddc5 kernel: sd 4:0:0:0: [sdb] Attached SCSI removable disk
Oct 17 23:05:20 000c6e7eddc5 kernel: sd 4:0:0:0: Attached scsi generic sg2 type 0
Oct 17 23:05:20 000c6e7eddc5 kernel: usb-storage: device scan complete
Oct 17 23:05:21 000c6e7eddc5 hald: mounted /dev/sdb1 on behalf of uid 0
Oct 17 23:05:53 000c6e7eddc5 kernel: usb 4-3: new high speed USB device using ehci_hcd and address 6
Oct 17 23:05:53 000c6e7eddc5 kernel: usb 4-3: new device found, idVendor=13fe, idProduct=1a00
Oct 17 23:05:53 000c6e7eddc5 kernel: usb 4-3: new device strings: Mfr=1, Product=2, SerialNumber=3
Oct 17 23:05:53 000c6e7eddc5 kernel: usb 4-3: Product: DataTraveler 2.0
Oct 17 23:05:53 000c6e7eddc5 kernel: usb 4-3: Manufacturer: Kingston
Oct 17 23:05:53 000c6e7eddc5 kernel: usb 4-3: SerialNumber: 5B6A1B855850
Oct 17 23:05:53 000c6e7eddc5 kernel: usb 4-3: configuration #1 chosen from 1 choice
Oct 17 23:05:53 000c6e7eddc5 kernel: scsi5 : SCSI emulation for USB Mass Storage devices
Oct 17 23:05:53 000c6e7eddc5 kernel: usb-storage: device found at 6
Oct 17 23:05:53 000c6e7eddc5 kernel: usb-storage: waiting for device to settle before scanning
Oct 17 23:05:54 000c6e7eddc5 kernel: scsi 5:0:0:0: Direct-Access     Kingston DataTraveler 2.0 PMAP PQ: 0 ANSI: 0 CCS
Oct 17 23:05:55 000c6e7eddc5 kernel: sd 5:0:0:0: [sdc] 2015232 512-byte hardware sectors (1032 MB)
Oct 17 23:05:55 000c6e7eddc5 kernel: sd 5:0:0:0: [sdc] Write Protect is off
Oct 17 23:05:55 000c6e7eddc5 kernel: sd 5:0:0:0: [sdc] Mode Sense: 23 00 00 00
Oct 17 23:05:55 000c6e7eddc5 kernel: sd 5:0:0:0: [sdc] Assuming drive cache: write through
Oct 17 23:05:55 000c6e7eddc5 kernel: sd 5:0:0:0: [sdc] 2015232 512-byte hardware sectors (1032 MB)
Oct 17 23:05:55 000c6e7eddc5 kernel: sd 5:0:0:0: [sdc] Write Protect is off
Oct 17 23:05:55 000c6e7eddc5 kernel: sd 5:0:0:0: [sdc] Mode Sense: 23 00 00 00
Oct 17 23:05:55 000c6e7eddc5 kernel: sd 5:0:0:0: [sdc] Assuming drive cache: write through
Oct 17 23:05:55 000c6e7eddc5 kernel:  sdc: sdc1
Oct 17 23:05:55 000c6e7eddc5 kernel: sd 5:0:0:0: [sdc] Attached SCSI removable disk
Oct 17 23:05:55 000c6e7eddc5 kernel: sd 5:0:0:0: Attached scsi generic sg3 type 0
Oct 17 23:05:55 000c6e7eddc5 kernel: usb-storage: device scan complete
Oct 17 23:05:56 000c6e7eddc5 hald: mounted /dev/sdc1 on behalf of uid 0
Oct 17 23:06:08 000c6e7eddc5 kernel: usb 4-3: USB disconnect, address 6
Oct 17 23:06:08 000c6e7eddc5 hald[2170]: forcibly attempting to lazy unmount /dev/sdc1 as enclosing drive was disconnected
Oct 17 23:06:08 000c6e7eddc5 kernel: usb 4-4.2: reset high speed USB device using ehci_hcd and address 5
Oct 17 23:06:08 000c6e7eddc5 hald: unmounted /dev/sdc1 from '/media/FLASH_EIL' on behalf of uid 0
Oct 17 23:06:23 000c6e7eddc5 kernel: usb 4-4.2: device descriptor read/64, error -110
Oct 17 23:06:38 000c6e7eddc5 kernel: usb 4-4.2: device descriptor read/64, error -110
Oct 17 23:06:38 000c6e7eddc5 kernel: usb 4-4.2: reset high speed USB device using ehci_hcd and address 5
Oct 17 23:06:53 000c6e7eddc5 kernel: usb 4-4.2: device descriptor read/64, error -110
Oct 17 23:06:53 000c6e7eddc5 kernel: usb 4-4.2: device descriptor read/64, error -110
Oct 17 23:07:09 000c6e7eddc5 kernel: usb 4-4.2: reset high speed USB device using ehci_hcd and address 5
Oct 17 23:07:19 000c6e7eddc5 kernel: usb 4-4.2: device not accepting address 5, error -110
Oct 17 23:07:19 000c6e7eddc5 kernel: usb 4-4.2: reset high speed USB device using ehci_hcd and address 5
Oct 17 23:07:29 000c6e7eddc5 kernel: usb 4-4.2: device not accepting address 5, error -110
Oct 17 23:07:29 000c6e7eddc5 kernel: sd 4:0:0:0: scsi: Device offlined - not ready after error recovery
Oct 17 23:07:29 000c6e7eddc5 kernel: sd 4:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK,SUGGEST_OK
Oct 17 23:07:29 000c6e7eddc5 kernel: end_request: I/O error, dev sdb, sector 67296
Oct 17 23:07:29 000c6e7eddc5 kernel: Buffer I/O error on device sdb, logical block 8412
Oct 17 23:07:29 000c6e7eddc5 kernel: Buffer I/O error on device sdb, logical block 8413
Oct 17 23:07:29 000c6e7eddc5 kernel: Buffer I/O error on device sdb, logical block 8414
Oct 17 23:07:29 000c6e7eddc5 kernel: Buffer I/O error on device sdb, logical block 8415
Oct 17 23:07:29 000c6e7eddc5 kernel: Buffer I/O error on device sdb, logical block 8416
Oct 17 23:07:29 000c6e7eddc5 kernel: Buffer I/O error on device sdb, logical block 8417
Oct 17 23:07:29 000c6e7eddc5 kernel: Buffer I/O error on device sdb, logical block 8418
Oct 17 23:07:29 000c6e7eddc5 kernel: Buffer I/O error on device sdb, logical block 8419
Oct 17 23:07:29 000c6e7eddc5 hald[2170]: forcibly attempting to lazy unmount /dev/sdb1 as enclosing drive was disconnected
Oct 17 23:07:30 000c6e7eddc5 hald: unmounted /dev/sdb1 from '/media/STICK_128MB' on behalf of uid 0
Oct 17 23:07:29 000c6e7eddc5 kernel: Buffer I/O error on device sdb, logical block 8420
Oct 17 23:07:29 000c6e7eddc5 kernel: Buffer I/O error on device sdb, logical block 8421
Oct 17 23:07:29 000c6e7eddc5 kernel: sd 4:0:0:0: rejecting I/O to offline device
Oct 17 23:07:29 000c6e7eddc5 syslog-ng[2086]: last message repeated 2 times
Oct 17 23:07:29 000c6e7eddc5 kernel: sd 4:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
Oct 17 23:07:29 000c6e7eddc5 kernel: end_request: I/O error, dev sdb, sector 67536
Oct 17 23:07:29 000c6e7eddc5 kernel: usb 4-4.2: USB disconnect, address 5
Oct 17 23:07:29 000c6e7eddc5 kernel: scsi 4:0:0:0: rejecting I/O to dead device
Oct 17 23:07:29 000c6e7eddc5 syslog-ng[2086]: last message repeated 3 times
Oct 17 23:07:29 000c6e7eddc5 kernel: scsi 4:0:0:0: [sdb] READ CAPACITY failed
Oct 17 23:07:29 000c6e7eddc5 kernel: scsi 4:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK,SUGGEST_OK
Oct 17 23:07:29 000c6e7eddc5 kernel: scsi 4:0:0:0: [sdb] Sense not available.
Oct 17 23:07:29 000c6e7eddc5 kernel: scsi 4:0:0:0: rejecting I/O to dead device
Oct 17 23:07:29 000c6e7eddc5 kernel: scsi 4:0:0:0: [sdb] Write Protect is off
Oct 17 23:07:29 000c6e7eddc5 kernel: scsi 4:0:0:0: [sdb] Mode Sense: 00 00 00 00
Oct 17 23:07:29 000c6e7eddc5 kernel: scsi 4:0:0:0: [sdb] Assuming drive cache: write through
Oct 17 23:07:29 000c6e7eddc5 kernel: scsi 4:0:0:0: rejecting I/O to dead device
Oct 17 23:07:29 000c6e7eddc5 kernel: FAT: FAT read failed (blocknr 33)
Oct 17 23:07:29 000c6e7eddc5 kernel: usb 4-4.2: new high speed USB device using ehci_hcd and address 7
Oct 17 23:07:45 000c6e7eddc5 kernel: usb 4-4.2: device descriptor read/64, error -110
Oct 17 23:07:45 000c6e7eddc5 kernel: usb 4-4.2: device descriptor read/64, error -110
Oct 17 23:08:00 000c6e7eddc5 kernel: usb 4-4.2: new high speed USB device using ehci_hcd and address 8
Oct 17 23:08:15 000c6e7eddc5 kernel: usb 4-4.2: device descriptor read/64, error -110
Oct 17 23:08:15 000c6e7eddc5 kernel: usb 4-4.2: device descriptor read/64, error -110
Oct 17 23:08:30 000c6e7eddc5 kernel: usb 4-4.2: new high speed USB device using ehci_hcd and address 9
Oct 17 23:08:41 000c6e7eddc5 kernel: usb 4-4.2: device not accepting address 9, error -110
Oct 17 23:08:41 000c6e7eddc5 kernel: usb 4-4.2: new high speed USB device using ehci_hcd and address 10
Oct 17 23:08:51 000c6e7eddc5 kernel: usb 4-4.2: device not accepting address 10, error -110








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