I suffer from the same bug.
Unlike Albert Weichselbraun I also encountered this using kernel 2.6.31-20 (and
2.6.35-7).
I have 2 pieces of 2TB WD greenpower hdds in one external Raidsonic case
connected via one usb port (JBOD system).
This happens despite of the fact that the disks were idling (contrary to what
others mentioned so far).
This is extremely irritating since after the last line the devices
disappear from /dev/sdx so I cannot even manually remount them.
Restarting the PC does not help nor does disconnecting the USB cable.
The only solution so far was to power down the external case.
Any suggestions would be highly appreciated!
kernel log:
kernel: [252789.528077] usb 1-3: new high speed USB device using ehci_hcd and
address 4
kernel: [252789.664057] scsi3 : usb-storage 1-3:1.0
kernel: [252790.665165] scsi 3:0:0:0: Direct-Access WDC WD20 EARS-00J2GB0
PQ: 0 ANSI: 2 CCS
kernel: [252790.665903] scsi 3:0:0:1: Direct-Access WDC WD20 EARS-00S8B1
PQ: 0 ANSI: 2 CCS
kernel: [252790.666583] sd 3:0:0:0: Attached scsi generic sg2 type 0
kernel: [252790.666802] sd 3:0:0:1: Attached scsi generic sg3 type 0
kernel: [252790.705220] sd 3:0:0:0: [sdb] 3907029168 512-byte logical blocks:
(2.00 TB/1.81 TiB)
kernel: [252790.706260] sd 3:0:0:0: [sdb] Write Protect is off
kernel: [252790.706268] sd 3:0:0:0: [sdb] Mode Sense: 00 38 00 00
kernel: [252790.706272] sd 3:0:0:0: [sdb] Assuming drive cache: write through
kernel: [252790.708569] sd 3:0:0:0: [sdb] Assuming drive cache: write through
kernel: [252790.708585] sdb:
kernel: [252790.716782] sd 3:0:0:1: [sdc] 3907029168 512-byte logical blocks:
(2.00 TB/1.81 TiB)
kernel: [252790.717686] unknown partition table
kernel: [252790.722066] sd 3:0:0:1: [sdc] Write Protect is off
kernel: [252790.722076] sd 3:0:0:1: [sdc] Mode Sense: 00 38 00 00
kernel: [252790.722081] sd 3:0:0:1: [sdc] Assuming drive cache: write through
kernel: [252790.725025] sd 3:0:0:0: [sdb] Assuming drive cache: write through
kernel: [252790.725037] sd 3:0:0:0: [sdb] Attached SCSI disk
kernel: [252790.726222] sd 3:0:0:1: [sdc] Assuming drive cache: write through
kernel: [252790.726238] sdc: unknown partition table
kernel: [252790.746133] sd 3:0:0:1: [sdc] Assuming drive cache: write through
kernel: [252790.746146] sd 3:0:0:1: [sdc] Attached SCSI disk
kernel: [252792.484993] EXT4-fs (sdc): recovery complete
kernel: [252792.485636] EXT4-fs (sdc): mounted filesystem with ordered data
mode. Opts: (null)
kernel: [252792.801099] EXT4-fs (sdb): recovery complete
kernel: [252792.801704] EXT4-fs (sdb): mounted filesystem with ordered data
mode. Opts: (null)
kernel: [411692.542758] usb 1-3: USB disconnect, address 5
kernel: [411736.844265] JBD2: I/O error detected when updating journal
superblock for sdc-8.
kernel: [411755.473553] JBD2: I/O error detected when updating journal
superblock for sdb-8.
--
external USB hard drive disconnects
https://bugs.launchpad.net/bugs/349767
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