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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Colin Ian King (colin-king)

** Changed in: linux (Ubuntu Xenial)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1652132

Title:
  Call trace when testing fstat stressor on ppc64el with virtual
  keyboard and mouse present

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  == SRU REQUEST [Xenial, Yakkety, Zesty] ==

  Ubuntu 16.04.1
  Kernel = 4.4.0-53-generic-74-Ubuntu ppc64le

  When running the stress-ng "fstat" stressor, it is trying to access
  the USB bus and giving a call trace and locking up any further USB
  activity (lsusb hangs). This only seems to occur so far on
  openpower(Firestone and Garrison) where there is a virtual USB
  keyboard and mouse built into the BMC.

  From lsusb(before crashing): Bus 001 Device 004: ID 046b:ff10 American
  Megatrends, Inc. Virtual Keyboard and Mouse

  Another openpower server(Briggs) has no virtual usb devices and does
  not experience the failure.

  Please see attached kern.log and dmesg output for further details.

  == Fix ==

  Quirking the Virtual AMI keyboard and mouse with ALWAYS_POLL addresses
  the issue.  The patch has been accepted into the upstream queue for
  4.11, see http://www.spinics.net/lists/linux-usb/msg152977.html

  == Test Case ==

  run 10 times:
  sudo stress-ng --fstat 128 -t 60 -v

  Without the fix, it will hang, with the fix there is no hang or USB
  error messages.

  == Regression Potential ==

  This only quirks a specific AMI virtual keyboard and mouse into a poll
  mode, so it touches one device. Futhermore, the poll mode shouldn't
  affect operation; it just makes the URB handling less efficient.

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