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    SubjectRe: USB misbehavior causes system hang
    On Mon, Mar 05, 2007 at 02:17:28AM -0800, Andrew Morton wrote:
    > > On Tue, 27 Feb 2007 09:06:21 -0500 Eric Buddington <ebuddington@verizon.net> wrote:
    > > 2.6.20-mm2 #1 Mon Feb 26 13:16:04 EST 2007 i686 unknown
    > >
    > > I have an external USB drive (WD MyBook 5000YS), which I use for backups.
    > >
    > > When I try to back up to it, it works for a while, but inevitably
    > > starts resetting like mad, gives I/O errors, and then (here's the
    > > problem), the softdog module reboots the system.
    > >
    > > ---------------------------
    > > scsi1 : SCSI emulation for USB Mass Storage devices
    > > input: Western Digital External HDD as /class/input/input8
    > > input: USB HID v1.11 Device [Western Digital External HDD] on usb-0000:00:03.2-6
    > > .2
    > > scsi 1:0:0:0: Direct-Access WD 5000YS External 106a PQ: 0 ANSI: 4
    > > SCSI device sda: 976773168 512-byte hdwr sectors (500108 MB)
    > > sda: Write Protect is off
    > > sda: assuming drive cache: write through
    > > SCSI device sda: 976773168 512-byte hdwr sectors (500108 MB)
    > > sda: Write Protect is off
    > > sda: assuming drive cache: write through
    > > sda: sda1 sda2
    > > sd 1:0:0:0: Attached scsi disk sda
    > > sd 1:0:0:0: Attached scsi generic sg0 type 0
    > > reiser4[pdflush(194)]: disable_write_barrier (fs/reiser4/wander.c:234)[zam-1055]
    > > :
    > > NOTICE: md1 does not support write barriers, using synchronous write instead.
    > > reiser4: sda2: found disk format 4.0.0.
    > >
    > > ---- (works fine here for a while, then:) ----------
    > >
    > > usb 1-6.2: reset high speed USB device using ehci_hcd and address 36
    > > usb 1-6.2: device descriptor read/64, error -110
    > > usb 1-6.2: device descriptor read/64, error -110
    > > usb 1-6.2: reset high speed USB device using ehci_hcd and address 36
    > > usb 1-6.2: device descriptor read/64, error -110
    > > usb 1-6.2: device descriptor read/64, error -110
    > > usb 1-6.2: reset high speed USB device using ehci_hcd and address 36
    > > usb 1-6.2: device descriptor read/8, error -110
    > > usb 1-6.2: device descriptor read/8, error -110
    > > usb 1-6.2: reset high speed USB device using ehci_hcd and address 36
    > > usb 1-6.2: device descriptor read/8, error -110
    > > usb 1-6.2: device descriptor read/8, error -110
    > > sd 1:0:0:0: scsi: Device offlined - not ready after error recovery
    > > sd 1:0:0:0: SCSI error: return code = 0x00050000
    > > end_request: I/O error, dev sda, sector 919931588
    > > sd 1:0:0:0: rejecting I/O to offline device
    > > sd 1:0:0:0: SCSI error: return code = 0x00010000
    > > end_request: I/O error, dev sda, sector 919931828
    > > sd 1:0:0:0: rejecting I/O to offline device
    > > sd 1:0:0:0: rejecting I/O to offline device
    > > sd 1:0:0:0: rejecting I/O to offline device
    >
    > Does 2.6.20 do this? 2.6.21-rc1?

    2.6.20-mm2 seems to be OK; I've been backing up to the disk for a few
    hours now, with no problem.

    -Eric
    -
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