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[Rocko <rockorequin@xxxxxxxxxxx>]

The regression is still in 3.17.1.

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https://bugs.launchpad.net/bugs/1380444

Title:
  xhci locks up computer with NULL pointer dereference trying to wake up
  external USB3 disk

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  In Ubuntu 14.10, my laptop locks up completely when trying to wake my
  WD 1230 USB3 external hard drive from its default 10-minute standby.

  The system tries to wake up the drive, which is unsuccessful, and
  after a few seconds uas_eh_abort_handler gets called. Shortly after
  this the NULL pointer dereference occurs in xhci_alloc_streams or
  xhci_check_streams_endpoint (most times the NULL pointer dereference
  error doesn't even get persisted to disk, so there may be other points
  where it occurs). Not long after this the laptop locks up completely
  and both it and the hard drive have to be power-cycled.

  I can put the drive manually into and out of standby using hdparm, so
  I guess there are two problems: one which makes the drive crash (ie it
  must crash because it needs to be power cycled) and the other being
  the NULL pointer dereference and complete kernel lockup.

  The last good kernel was 3.15-rc4. All kernels since since have this
  problem, including the latest upstream kernel. I did a git bisect,
  which says:

  The merge base 6d4596905b65bf4c63c1a008f50bf385fa49f19b is bad. This
  means the bug has been fixed between
  6d4596905b65bf4c63c1a008f50bf385fa49f19b and
  [89ca3b881987f5a4be4c5dbaa7f0df12bbdde2fd]

  I have reported this upstream at
  https://bugzilla.kernel.org/show_bug.cgi?id=85741. More details
  including the logs showing the error ocurring are there.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-22-generic 3.16.0-22.29
  ProcVersionSignature: Ubuntu 3.16.0-22.29-generic 3.16.4
  Uname: Linux 3.16.0-22-generic x86_64
  ApportVersion: 2.14.7-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  rocko      3333 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Oct 13 10:15:41 2014
  HibernationDevice: RESUME=UUID=ca164267-edcd-4d3c-b325-acbd60802e7a
  InstallationDate: Installed on 2014-02-08 (246 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140207)
  MachineType: Dell Inc. Dell System XPS L502X
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.16.0-22-generic root=UUID=3e785733-7f93-4ea8-8cdd-c42606029905 ro rootflags=subvol=@ quiet splash init=/lib/systemd/systemd vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-22-generic N/A
   linux-backports-modules-3.16.0-22-generic  N/A
   linux-firmware                             1.135
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2014-10-04 (8 days ago)
  dmi.bios.date: 05/29/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 0NJT03
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA11:bd05/29/2012:svnDellInc.:pnDellSystemXPSL502X:pvr:rvnDellInc.:rn0NJT03:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L502X
  dmi.sys.vendor: Dell Inc.

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