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[Launchpad Bug Tracker <1346952@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/utopic-proposed/mir

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https://bugs.launchpad.net/bugs/1346952

Title:
  [qtcomp] Random crash in Mir input when running AP tests: [terminate
  called after throwing an instance of '...' what(): assign: File
  exists] when constructing a mir::AsioMainLoop::FDHandler

Status in Mir:
  Fix Committed
Status in Mir 0.5 series:
  Fix Committed
Status in Qt integration with the Mir display server:
  Invalid
Status in “mir” package in Ubuntu:
  Triaged

Bug description:
  Steps to repro:
  1. Install QtCompositor - right now from silo6, see https://wiki.ubuntu.com/Unity8/QtComp
  2. Use https://wiki.ubuntu.com/Touch/Testing to get your device set up for running an autopilot test. That can be summarized roughly into running these commands on your PC:

      phablet-config edges-intro --disable
      adb shell powerd-cli display on bright &    #keeps the display on

  3. Run an AP test. This one tends to expose the bug easily:
       phablet-test-run -p ubuntu-html5-ui-toolkit-autopilot ubuntu_html5_ui_toolkit

  The crash we get has this stack trace:
  http://paste.ubuntu.com/7836063/

  "terminate called after throwing an instance of 
  'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >'
  what():  assign: File exists"

  Which points onto the constructor of
  boost::asio::posix::basic_stream_descriptor which in case of the
  default epoll reactor will call epoll_ctl to add the given file
  descriptor. The error number EEXIST indicates that the file descriptor
  is already inside the set.

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