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[gianluca <amato@xxxxxxxxxxxx>]

I found the commit which causes this error.

commit 1918a05d9621d9659783dfaf7b009f873e835d53
Author: James Bottomley <JBottomley@xxxxxxxxxxxxx>
Date:   Thu Jul 3 19:17:34 2014 +0200

    scsi: handle flush errors properly
    
    commit 89fb4cd1f717a871ef79fa7debbe840e3225cd54 upstream.
    
    Flush commands don't transfer data and thus need to be special cased
    in the I/O completion handler so that we can propagate errors to
    the block layer and filesystem.
    
    Signed-off-by: James Bottomley <JBottomley@xxxxxxxxxxxxx>
    Reported-by: Steven Haber <steven@xxxxxxxxxx>
    Tested-by: Steven Haber <steven@xxxxxxxxxx>
    Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
    Signed-off-by: Christoph Hellwig <hch@xxxxxx>
    Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>

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https://bugs.launchpad.net/bugs/1366538

Title:
  Synchronisation/close /dev/sdi: i/o error on target host

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 14.04.1 x86-64
  wanting to unmout a pata drive (usb attached), I get this (title) "Warning from libparted" when gparted launches.
  Same issue with another pc x86-64
  Errors retries then ignore, shred /dev/sdi fails:

  shred: /dev/sdi : pass 1/2 (random)…
  shred: /dev/sdi : pass 1/2 (random)…231MiB/94GiB 0 %
  shred: /dev/sdi : failure of fdatasync: i/o error on target host

  I reached to shred the drive from a 12.04.4 i386 pc with no error.

  Sep  7 15:07:08 nux kernel: [261448.072475] usb 5-1: new high-speed USB device number 10 using xhci_hcd
  Sep  7 15:07:09 nux kernel: [261448.202999] usb 5-1: New USB device found, idVendor=04cf, idProduct=8818
  Sep  7 15:07:09 nux kernel: [261448.203008] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
  Sep  7 15:07:09 nux kernel: [261448.203013] usb 5-1: Product: USB Mass Storage Device
  Sep  7 15:07:09 nux kernel: [261448.203018] usb 5-1: Manufacturer: Myson Century, Inc.
  Sep  7 15:07:09 nux kernel: [261448.205463] usb-storage 5-1:1.0: USB Mass Storage device detected
  Sep  7 15:07:09 nux kernel: [261448.205673] scsi20 : usb-storage 5-1:1.0
  Sep  7 15:07:10 nux kernel: [261449.206849] scsi 20:0:0:0: Direct-Access     HTS72101 0G9AT00          MCZO PQ: 0 ANSI: 0 CCS
  Sep  7 15:07:10 nux kernel: [261449.207763] sd 20:0:0:0: Attached scsi generic sg7 type 0
  Sep  7 15:07:10 nux kernel: [261449.207901] sd 20:0:0:0: [sdi] 195371568 512-byte logical blocks: (100 GB/93.1 GiB)
  Sep  7 15:07:10 nux kernel: [261449.208068] sd 20:0:0:0: [sdi] Write Protect is off
  Sep  7 15:07:10 nux kernel: [261449.208074] sd 20:0:0:0: [sdi] Mode Sense: 00 14 00 00
  Sep  7 15:07:10 nux kernel: [261449.208280] sd 20:0:0:0: [sdi] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
  Sep  7 15:07:10 nux kernel: [261449.555232]  sdi: unknown partition table
  Sep  7 15:07:10 nux kernel: [261449.555926] sd 20:0:0:0: [sdi] Attached SCSI disk
  Sep  7 15:07:43 nux kernel: [261482.219026] end_request: critical target error, dev sdi, sector 0
  Sep  7 15:07:52 nux kernel: [261492.015180] end_request: critical target error, dev sdi, sector 0
  Sep  7 15:07:55 nux kernel: [261494.261159] end_request: critical target error, dev sdi, sector 0
  Sep  7 15:16:23 nux kernel: [262003.027005] end_request: critical target error, dev sdi, sector 0
  Sep  7 15:16:35 nux kernel: [262014.215352] end_request: critical target error, dev sdi, sector 0
  Sep  7 15:16:35 nux kernel: [262014.859651] end_request: critical target error, dev sdi, sector 0

  [EDIT:
  Once shreded, no error on the i386, but still same error on the 2 x86-64]

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