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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1542246

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: trusty

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https://bugs.launchpad.net/bugs/1542246

Title:
  ERROR Transfer event TRB DMA ptr not part of current TD ep_index 4
  comp_code 1

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hi, 
  I am using Ubuntu 14.04, ubuntu-14 3.13.0-74-generic #118-Ubuntu SMP Thu Dec 17 22:52:10 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
  also tried Linux dmy-ubuntu-14 4.3.3-040303-generic #201512150130 SMP Tue Dec 15 06:32:30 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
   same behaviour in both the kernels

  For the past couple of days I am having problems related to libusb
  bulk transfers ( async ). When the debug prints are enabled from
  libusb, I could see more packets ( example 5 packets each 163840 bytes
  ) were received by libusb. However, the callback was called only once
  ( example only 163840 bytes ) were received by the application using
  libsub.

  We are seeing this issue only past fews days and computers that has
  latest kernel updates. For example computers that did not update or
  kernel dated July 2015 or Jan 2105 are still working.

  Today I upgraded Linux kernel to 3.19 to test but no difference. With
  3.19 kernel I goet following message in dmesg,

  
  [14720.137271] xhci_hcd 0000:08:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 4 comp_code 1 [14720.137282] xhci_hcd 0000:08:00.0: Looking for event-dma 00000000b25bd400 trb-start 00000000b25bd2d0 trb-end 00000000b25bd360 seg-start 00000000b25bd000 seg-end 00000000b25bdff0 
  [14720.138698] xhci_hcd 0000:08:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 4 comp_code 1 [14720.138706] xhci_hcd 0000:08:00.0: Looking for event-dma 00000000b25bd4a0 trb-start 00000000b25bd2d0 trb-end 00000000b25bd360 seg-start 00000000b25bd000 seg-end 00000000b25bdff0 
  [14720.140146] xhci_hcd 0000:08:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 4 comp_code 1 [14720.140155] xhci_hcd 0000:08:00.0: Looking for event-dma 00000000b25bd540 trb-start 00000000b25bd2d0 trb-end 00000000b25bd360 seg-start 00000000b25bd000 seg-end 00000000b25bdff0 
  [14720.140188] xhci_hcd 0000:08:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 4 comp_code 13 [14720.140192] xhci_hcd 0000:08:00.0: Looking for event-dma 00000000b25bd550 trb-start 00000000b25bd2d0 trb-end 00000000b25bd360 seg-start 00000000b25bd000 seg-end 00000000b25bdff0

  Do you see any possible conflicts, with latest Kernels and libusb) (
  esply for USB 3.0 ) Have anyone seen similar issues recently ?

  This is easily reproducible.

  Scenario that fails:
  --------------------------
  1. USB 3.0 device that can stream 16KB chunks.
  2. Use libusb and submit more than 16K bulk read requests e.g. 160KB bulkread request to libusb.
  3. start the data transfer from USB 3.0 device and the transfer failes at the end of getting data, i.e. when a short packet is transferred.

  
  However, the same logic worked for kernel versions below 3.13.0-71 ( including this version )

  Scenario that works with new kernel ( but fails after sometime that might be our device and stack through put issue )
  --------------------------------------------------
  1. in the above setup if I just reduce the bulk request size to 16KB instead of 160KB, then it works.

  
  TIA.

  /Dinesh

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