[Xcb] Mesa-XCB causes PyMol crash

[Donnie Berkholz]

Hi,

I've hit an error in Mesa-XCB that I cannot reproduce when building Mesa
identically but without XCB. The program PyMol (pymol.sf.net) sucks up
100% CPU for a sec, then crashes shortly after starting with:

X Error of failed request:  BadLength (poly request too large or
internal Xlib length error)
  Major opcode of failed request:  145 (GLX)
  Minor opcode of failed request:  2 (X_GLXRenderLarge)
  Serial number of failed request:  679
  Current serial number in output stream:  685
 PyMOL: abrupt program termination.

This is on a ppc system, FWIW.

Thanks,
Donnie

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