LIBGL_ALWAYS_INDIRECT=1 glxgears 
fails on latest git on r600 with:

X Error of failed request:  255
  Major opcode of failed request:  155 (GLX)
  Minor opcode of failed request:  1 (X_GLXRender)
  Serial number of failed request:  42
  Current serial number in output stream:  164

After rendering one frame. this is on a ATI HD5850. This is 100% repeatable and
occures with every opengl app. Direct Rendering works fine. 

Indirect rendering works with the vesa x11 driver and llvmpipe. xf86-video-ati
versus xf86-video-modestetting both fail.