I got some backtraces. They are slightly different depending on whether glxgears is run first or compiz. I reported the problem to linux- bugs(at)nvidia.com and hope they will come back to us:
$ glxgears $ compiz (gdb) symbol-file /usr/lib/debug/usr/bin/Xorg (gdb) where #0 0xb7db97cc in free () from /lib/tls/i686/cmov/libc.so.6 #1 0x081c3281 in Xfree (ptr=0xfffffffb) at ../../os/utils.c:1471 #2 0xb7216b06 in _nv002179X () from /usr/lib/xorg/modules/drivers//nvidia_drv.so #3 0x00000003 in ?? () #4 0xb7217744 in ?? () from /usr/lib/xorg/modules/drivers//nvidia_drv.so #5 0xbf921e88 in ?? () #6 0x00000000 in ?? () $ compiz $ gtk-window-decorator $ glxgears (gdb) where #0 0xb726e98a in _nv001744X () from /usr/lib/xorg/modules/drivers//nvidia_drv.so #1 0xb726da34 in ?? () from /usr/lib/xorg/modules/drivers//nvidia_drv.so #2 0x764b1210 in ?? () #3 0xb6370010 in ?? () #4 0x08215950 in ?? () #5 0x084fba78 in ?? () #6 0x084f05e8 in ?? () #7 0xb6370010 in ?? () #8 0x08215950 in ?? () #9 0x08205538 in ?? () #10 0x00000000 in ?? () -- [nvidia-glx-new] glxgears, 3d apps crash X when using compiz-fusion (gutsy) https://bugs.launchpad.net/bugs/130325 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs