*** This bug is a duplicate of bug 500069 ***
    https://bugs.launchpad.net/bugs/500069


I don't think it is a duplicated one with bug #500069.

>From the log,  some failure happened during writing sector to  usb HDD. and 
>caused " flush" task hang, then
lowered speed, but seems no such kind of errors in bug #500069.

In fact,  long ago, there were a patch[1](just a quirk) to make the 
device[152d:2329] work well, so
it is a regression?

Considered it is easily reproduced for you, could you provide some usbmon data 
to
help fix the problem?

About how to trace usbmon, see Documentation/usb/usbmon.txt.


[1]
commit 3030ca4cf4abbdd2dd850a14d20e9fca5937ffb5
Author: Phil Dibowitz <p...@ipom.com>
Date:   Sun Oct 19 08:17:54 2008 +0200

    USB: storage: Avoid I/O errors when issuing SCSI ioctls to JMicron USB/ATA 
bridge
    
    Here's the patch that implements the fix you suggested to avoid the
    I/O errors that I was running into with my new USB enclosure with a
    JMicron USB/ATA bridge, while issuing scsi-io USN or other such
    queries used by Fedora's mkinitrd.
    http://bugzilla.kernel.org/show_bug.cgi?id=9638#c85
 


** Bug watch added: Linux Kernel Bug Tracker #9638
   http://bugzilla.kernel.org/show_bug.cgi?id=9638

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https://bugs.launchpad.net/bugs/758430

Title:
  USB storage device slow with reset and I/O error

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