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[Sinclair Yeh <syeh@xxxxxxxxxx>]

Hi, has anyone tried this on 16.04 with the software rasterizer
(swrast_dri.so)?

I'm seeing the same crash with with four 2560x1600 displays on Compiz
0.9.12.2.

The crash happens in libopengl.so when it tries to deference "priv"

  const GLTexture::Matrix &
  GLTexture::matrix () const
  {
      return priv->matrix;
  }

In GDB, it's clear that "priv" is pointing to an invalid memory
location.

"Copy to Texture" is set to ON by default, and I've verified it with the
configuration manager.  The same configuration works with a HW
accelerated driver.

-- 
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packagers, which is subscribed to compiz in Ubuntu.
https://bugs.launchpad.net/bugs/1459613

Title:
  connecting 2x 4k screens on a Dell XPS12 (9Q33): compiz crashed with
  SIGSEGV in GLTexture::matrix() from GLScreen::glPaintCompositedOutput

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