On Thu, 26 Apr 2012, matt wrote:

Interesting. Another Radeon 4650 (rv730) is not working here, giving Bus Errors at the same address whenever certain applications are launched. Failing examples: Firefox, gedit, qt4-designer Successful: xfce4-terminal, ioquake3, compiz

Fixed this issue using the changes indicated in the below patch, which
solved my issue with x bus errors. It looks like glxGetScreen was
choking. This may help users with similar problems in compiz or Kwin.
FYI I manually applied changes in the patch to x11-servers/xorg-server,
not sure if the patch below would apply cleanly.

diff --git a/glx/glxdri.c b/glx/glxdri.c
index 326f539..f6ef784 100644
--- a/glx/glxdri.c
+++ b/glx/glxdri.c
@@ -230,7 +230,7 @@ __glXDRIdrawableDestroy(__GLXdrawable *drawable)

    /* If the X window was destroyed, the dri DestroyWindow hook will
     * aready have taken care of this, so only call if pDraw isn't NULL. */
-    if (drawable->pDraw != NULL) {
+    if (drawable->pDraw != NULL && drawable->pDraw->type == DRAWABLE_WINDOW) {
        screen = (__GLXDRIscreen *) glxGetScreen(drawable->pDraw->pScreen);
        (*screen->core->destroyDrawable)(private->driDrawable);


Good catch!  Please enter a PR for this!
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