The source of the buffer with uninitialized memory is 
  gdk_pixbuf_get_pixels(pixbuf);
This shows up in valgrind as
  Uninitialised value was created by a stack allocation
    at 0x10EA312D: general_composite_rect (pixman-general.c:105)

This is an large buffer allocated on the stack to avoid dynamic
allocation for small images.  It is here that I'm out of my depth, and
we need a simple test case.

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https://bugs.launchpad.net/bugs/988880

Title:
  Conditional jump or move depends on uninitialised value(s)
  (unity::launcher::LauncherIcon::TextureFromSpecificGtkTheme)

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