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[Bryce Harrington <710108@xxxxxxxxxxxxxxxxxx>]

I've reproduced this by holding alt+tab down for a moment with unity.
Seems to be the upstream bug which I've attached.

Looks like compiz is passing in an invalid mipmap texture.

            (*GL::generateMipmap) (priv->target);

should probably add a check prior to that, like:

            ASSERT(priv-target->Image[0][0]->Data != NULL);


** Bug watch added: freedesktop.org Bugzilla #32246
   http://bugs.freedesktop.org/show_bug.cgi?id=32246

** Also affects: mesa via
   http://bugs.freedesktop.org/show_bug.cgi?id=32246
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/710108

Title:
  compiz crashed with SIGSEGV in _mesa_generate_mipmap()