What are the ways to figure out if the symptoms I am seeing is because
of this bug or something else?

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https://bugs.launchpad.net/bugs/1313279

Title:
  xHCI host not responding to stop endpoint command

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Description:  Ubuntu 14.04 LTS
  Release:      14.04
  Hardware: Intel NUC D34010WYK (Core i3 4010U)
  Memory: 4 gigabytes
  USD device: PCTV 292e DVB-T tuner

  I have 2 PCTV 292e DVB-T tuners connected to the system. When I start
  to use either of the tuner, the xHCI host crashes. Since I'm booting
  from an USB disk. If I only connect 1 of the tuners, the system works
  ok. It does not matter which one of the tuners I connect.

  [   68.990396] xhci_hcd 0000:00:14.0: xHCI host not responding to stop 
endpoint command.
  [   68.990402] xhci_hcd 0000:00:14.0: Assuming host is dying, halting host.

  Sometimes this also leads to this:

  [  638.183002] IP: [<ffffffff815325dd>] usb_enable_link_state+0x2d/0x2f0
  [  638.183057] PGD 0 
  [  638.183077] Oops: 0000 [#1] SMP 

  I can also observe the same fault with OpenELEC Linux distribution
  that runs kernel 3.14 when I run the system from an internal SATA SSD
  drive (not from an external USB disk).

  lsusb -v: http://paste.ubuntu.com/7343384/
  dmesg: http://sprunge.us/HMXH
  dmesg (crash type 2): http://sprunge.us/PSiX

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: lubuntu-desktop 0.55
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  Date: Sun Apr 27 11:12:22 2014
  InstallationDate: Installed on 2014-04-07 (19 days ago)
  InstallationMedia: Lubuntu 13.10 "Saucy Salamander" - Release amd64 
(20131016.1)
  SourcePackage: lubuntu-meta
  UpgradeStatus: Upgraded to trusty on 2014-04-26 (0 days ago)

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