I installed 3.16.0-031600rc7-generic and the problem still occurs.

Jul 30 15:33:52 allhats2 kernel: [  490.626397] usb 2-1.6: USB disconnect,
device number 68
Jul 30 15:33:52 allhats2 kernel: [  490.633529] sd 6:0:0:0: [sdd] Unhandled
error code
Jul 30 15:33:52 allhats2 kernel: [  490.633535] sd 6:0:0:0: [sdd]
Jul 30 15:33:52 allhats2 kernel: [  490.633537] Result:
hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Jul 30 15:33:52 allhats2 kernel: [  490.633539] sd 6:0:0:0: [sdd] CDB:
Jul 30 15:33:52 allhats2 kernel: [  490.633541] Write(10): 2a 00 74 47 56
c0 00 00 f0 00
Jul 30 15:33:52 allhats2 kernel: [  490.633551] end_request: I/O error, dev
sdd, sector 1950832320
Jul 30 15:33:52 allhats2 kernel: [  490.633906] sd 6:0:0:0: [sdd] Unhandled
error code
Jul 30 15:33:52 allhats2 kernel: [  490.633907] sd 6:0:0:0: [sdd]
Jul 30 15:33:52 allhats2 kernel: [  490.633910] EXT4-fs warning (device
sdd1): __ext4_read_dirblock:909: error reading directory block (ino
100928893, block 0)
Jul 30 15:33:52 allhats2 kernel: [  490.633911] Result:
hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Jul 30 15:33:52 allhats2 kernel: [  490.633912] sd 6:0:0:0: [sdd] CDB:
Jul 30 15:33:52 allhats2 kernel: [  490.633913] Write(10): 2a 00 74 47 57
b0 00 00 f0 00
Jul 30 15:33:52 allhats2 kernel: [  490.633916] end_request: I/O error, dev
sdd, sector 1950832560



On Wed, Jul 30, 2014 at 12:03 PM, Joseph Salisbury <
<email address hidden>> wrote:

> Would it be possible for you to test the latest upstream kernel? Refer
> to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
> v3.16 kernel[0].
>
> If this bug is fixed in the mainline kernel, please add the following
> tag 'kernel-fixed-upstream'.
>
> If the mainline kernel does not fix this bug, please add the tag:
> 'kernel-bug-exists-upstream'.
>
> If you are unable to test the mainline kernel, for example it will not
> boot, please add the tag: 'kernel-unable-to-test-upstream'.
> Once testing of the upstream kernel is complete, please mark this bug as
> "Confirmed".
>
>
> Thanks in advance.
>
> [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-rc7-utopic/
>
>
> ** Changed in: linux (Ubuntu)
>    Importance: Undecided => Medium
>
> ** Changed in: linux (Ubuntu)
>        Status: Confirmed => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1350329
>
> Title:
>   External USB drives stopped working
>
> Status in “linux” package in Ubuntu:
>   Incomplete
>
> Bug description:
>   After a recent kernel upgrade, my external USB drives have become
>   unusable. They mount just fine, but when I go to use them, I get a
>   bunch of errors. This is from /var/log/syslog:
>
>   Jul 29 11:48:32 allhats2 kernel: [347359.464228] EXT4-fs (dm-31):
> mounted filesystem with ordered dat
>   a mode. Opts: (null)
>   Jul 29 11:49:13 allhats2 kernel: [347400.503491] usb 2-1.6: reset
> high-speed USB device number 7 using ehci-pci
>   Jul 29 11:49:18 allhats2 kernel: [347405.517258] sd 6:0:0:0: Device
> offlined - not ready after error recovery
>   Jul 29 11:49:18 allhats2 kernel: [347405.517269] sd 6:0:0:0: [sdd]
> Unhandled error code
>   Jul 29 11:49:18 allhats2 kernel: [347405.517270] sd 6:0:0:0: [sdd]
>   Jul 29 11:49:18 allhats2 kernel: [347405.517271] Result:
> hostbyte=DID_ABORT driverbyte=DRIVER_OK
>   Jul 29 11:49:18 allhats2 kernel: [347405.517273] sd 6:0:0:0: [sdd] CDB:
>   Jul 29 11:49:18 allhats2 kernel: [347405.517274] Write(10): 2a 00 74 44
> 1c b8 00 00 f0 00
>   Jul 29 11:49:18 allhats2 kernel: [347405.517279] end_request: I/O error,
> dev sdd, sector 1950620856
>   Jul 29 11:49:18 allhats2 kernel: [347405.517295] sd 6:0:0:0: rejecting
> I/O to offline device
>   Jul 29 11:49:18 allhats2 kernel: [347405.517297] sd 6:0:0:0: [sdd]
> killing request
>
>   I suspect it might be related to https://lists.debian.org/debian-
>   kernel/2014/03/msg00061.html except I'm seeing it on ehci-pci not
>   xHCI.
>
>   I tried booting with my Kubuntu 14.04 CD, and my disks mounted and
>   worked just fine.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 14.04
>   Package: ubuntu-release-upgrader-core 1:0.220.2
>   ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
>   Uname: Linux 3.13.0-32-generic x86_64
>   NonfreeKernelModules: nvidia
>   ApportVersion: 2.14.1-0ubuntu3.2
>   Architecture: amd64
>   CrashDB: ubuntu
>   CurrentDesktop: KDE
>   Date: Wed Jul 30 08:46:00 2014
>   InstallationDate: Installed on 2012-09-15 (682 days ago)
>   InstallationMedia: Kubuntu 12.04.1 LTS "Precise Pangolin" - Release
> amd64 (20120822.2)
>   PackageArchitecture: all
>   SourcePackage: ubuntu-release-upgrader
>   Symptom: ubuntu-release-upgrader
>   UpgradeStatus: Upgraded to trusty on 2014-04-27 (93 days ago)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1350329/+subscriptions
>



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