Created attachment 40267 [details] backtrace System: Fedora 14, Radeon 4850, x86_64. Using the system's mesa-dri-drivers package Compiz frequently crashes while resizing windows. The backtrace (attached) and the error message, "failed to attach dri2 front buffer XX", point to radeon_update_renderbuffers in radeon_common_context.c around line 745: bo = radeon_bo_open(...); if (bo == NULL) { fprintf(stderr, "failed to attach %s %d\n", regname, buffers[i].name); } ret = radeon_bo_get_tiling(bo, &tiling_flags, &pitch); An error message is printed when 'bo' could not be allocated, but bo is then happily dereferenced in radeon_bo_get_tiling afterwards. Working around the null pointer dereference (e.g. by adding a 'continue' in the "if bo==NULL" block) fixes the crash for me and I haven't seen visual artifacts yet, although the error message is printed from time to time while running Compiz. The same stacktrace was logged by several people over at https://bugzilla.redhat.com/show_bug.cgi?id=568593.
Thanks. Fix pushed to master: ef0720758e5ba34d0d163bdf5efc6e8dabd65aa8 and 7.9: 9b1ac4d127805f6a14415596e4a557fad3d570a5
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