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[Alan Griffiths <1535297@xxxxxxxxxxxxxxxxxx>]

I suspect the right solution is to fix the approach taken in Mesa to
detecting Mir:

All the above modules should be loaded with RTLD_LOCAL. As far as I can
tell they are so they shouldn't interact.

However, Mir's mesa.so.X client platform module reloads itself with
RTLD_GLOBAL so that Mesa can find a Mir entry point. (Yes, this is an
ugly hack.)

That is likely what causes symbols to be resolved from the wrong
protobuf library and the problems seen here.

** Also affects: mesa
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1535297

Title:
  Unity8 crashes on logout with "Error in `unity8': double free or
  corruption" called from libprotobuf.so.9, called from libprotobuf-
  lite.so.9

Status in Mesa:
  New
Status in Mir:
  Confirmed
Status in libphonenumber package in Ubuntu:
  Confirmed
Status in mir package in Ubuntu:
  Confirmed
Status in protobuf package in Ubuntu:
  Confirmed
Status in telephony-service package in Ubuntu:
  Confirmed
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  This is happening on a fresh setup, which is basically:
  Xenial 17Jan iso + unity8-desktop-session-mir package

  When I logout, I get a black screen. Turns out unity8 is crashing with
  a "double free or linked list corruption"

  Please find unity8.log attached

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