I have no idea if this is relevant, but on the box on which I get the exact same backtrace for unity (x86-PAE kernel; fglrx from x-updates), I also get the following. If this happens to be the symptom of the same problem, perhaps this shorter backtrace helps in debugging.
% gdb /usr/lib/nux/unity_support_test GNU gdb (GDB) 7.2-ubuntu Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i686-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /usr/lib/nux/unity_support_test...(no debugging symbols found)...done. (gdb) run Starting program: /usr/lib/nux/unity_support_test [Thread debugging using libthread_db enabled] Program received signal SIGSEGV, Segmentation fault. 0x00000000 in ?? () (gdb) bt #0 0x00000000 in ?? () #1 0xb7f21864 in nux::GraphicsDisplay::EnableVSyncSwapControl() () from /usr/lib/libnux-graphics-0.9.so.0 #2 0xb7f21e40 in nux::GraphicsDisplay::CreateOpenGLWindow(char const*, unsigned int, unsigned int, nux::WindowStyle, nux::GraphicsDisplay const*, bool) () from /usr/lib/libnux-graphics-0.9.so.0 #3 0xb7f410f9 in nux::DisplayAccessController::CreateGLWindow(char const*, unsigned int, unsigned int, nux::WindowStyle, nux::GraphicsDisplay*, bool) () from /usr/lib/libnux-graphics-0.9.so.0 #4 0x08048a86 in ?? () #5 0x08048e2f in ?? () #6 0xb7b92ce7 in __libc_start_main (main=0x8048e10, argc=1, ubp_av=0xbffff214, init=0x8048ed0, fini=0x8048ec0, rtld_fini=0xb7ff0ac0 <_dl_fini>, stack_end=0xbffff20c) at libc-start.c:226 #7 0x080489a1 in ?? () (gdb) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/686698 Title: compiz crashed with SIGSEGV in nux::IOpenGLSurface::UnlockRect() -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs