Hi! This bug affects me too. Backtrace and debug info from a recent crash on my machine are included. Ubuntu 12.04 64-bit with Nvidia Quadro FX 570, Nvidia driver 295.49. Please let me know if you need any more information. Nvidia driver DSO: 7f1ee15c1000-7f1ee1ca2000 r-xp 00000000 08:05 1967563 /usr/lib/nvidia-current-updates/xorg/nvidia_drv.so 7f1ee1ca2000-7f1ee1ea2000 ---p 006e1000 08:05 1967563 /usr/lib/nvidia-current-updates/xorg/nvidia_drv.so 7f1ee1ea2000-7f1ee1f4d000 rw-p 006e1000 08:05 1967563 /usr/lib/nvidia-current-updates/xorg/nvidia_drv.so Backtrace: Reading symbols from /lib/x86_64-linux-gnu/libgcc_s.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/x86_64-linux-gnu/libgcc_s.so.1 Reading symbols from /usr/lib/xorg/modules/extensions/libextmod.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/extensions/libextmod.so...done. done. Loaded symbols for /usr/lib/xorg/modules/extensions/libextmod.so Reading symbols from /usr/lib/xorg/modules/extensions/libdbe.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/extensions/libdbe.so...done. done. Loaded symbols for /usr/lib/xorg/modules/extensions/libdbe.so Reading symbols from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/libglx.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/x86_64-linux-gnu/xorg/extra-modules/libglx.so Reading symbols from /usr/lib/nvidia-current-updates/tls/libnvidia-tls.so.295.49...(no debugging symbols found)...done. Loaded symbols for /usr/lib/nvidia-current-updates/tls/libnvidia-tls.so.295.49 Reading symbols from /usr/lib/nvidia-current-updates/libnvidia-glcore.so.295.49...(no debugging symbols found)...done. Loaded symbols for /usr/lib/nvidia-current-updates/libnvidia-glcore.so.295.49 Reading symbols from /usr/lib/xorg/modules/extensions/librecord.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/extensions/librecord.so...done. done. Loaded symbols for /usr/lib/xorg/modules/extensions/librecord.so Reading symbols from /usr/lib/xorg/modules/extensions/libdri.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/extensions/libdri.so...done. done. Loaded symbols for /usr/lib/xorg/modules/extensions/libdri.so Reading symbols from /usr/lib/x86_64-linux-gnu/libdrm.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/x86_64-linux-gnu/libdrm.so.2 Reading symbols from /usr/lib/xorg/modules/extensions/libdri2.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/extensions/libdri2.so...done. done. Loaded symbols for /usr/lib/xorg/modules/extensions/libdri2.so Reading symbols from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so Reading symbols from /usr/lib/xorg/modules/drivers/nouveau_drv.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/xorg/modules/drivers/nouveau_drv.so Reading symbols from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.1 Reading symbols from /usr/lib/xorg/modules/drivers/vesa_drv.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/xorg/modules/drivers/vesa_drv.so Reading symbols from /usr/lib/xorg/modules/drivers/fbdev_drv.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/xorg/modules/drivers/fbdev_drv.so Reading symbols from /usr/lib/xorg/modules/libfb.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/libfb.so...done. done. Loaded symbols for /usr/lib/xorg/modules/libfb.so Reading symbols from /usr/lib/xorg/modules/libwfb.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/libwfb.so...done. done. Loaded symbols for /usr/lib/xorg/modules/libwfb.so Reading symbols from /usr/lib/xorg/modules/libfbdevhw.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/libfbdevhw.so...done. done. Loaded symbols for /usr/lib/xorg/modules/libfbdevhw.so Reading symbols from /usr/lib/xorg/modules/input/evdev_drv.so...(no debugging symbols found)...done. Loaded symbols for /usr/lib/xorg/modules/input/evdev_drv.so Reading symbols from /usr/lib/libmtdev.so.1...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libmtdev.so.1 0x00007f1ee68e5803 in select () from /lib/x86_64-linux-gnu/libc.so.6 (gdb) c Continuing. Program received signal SIGSEGV, Segmentation fault. 0xffffffffffffffff in ?? () (gdb) bt #0 0xffffffffffffffff in ?? () #1 0x00007f1ee1651801 in ?? () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so #2 0x00007f1ee1aa4630 in ?? () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so #3 0x00007f1ee1aa30b5 in ?? () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so #4 0x00007f1ee1aa486d in ?? () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so #5 0x00007f1ee877991c in damagePutImage (pDrawable=0x7f1eea7d9890, pGC=0x7f1eeaa47e10, depth=32, x=0, y=0, w=160, h=655, leftPad=0, format=2, pImage=0x7f1edec05000 "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"...) at ../../../miext/damage/damage.c:830 #6 0x00007f1ee8748ccc in ProcShmPutImage (client=0x7f1eea0b5470) ---Type to continue, or q to quit--- at ../../Xext/shm.c:598 #7 0x00007f1ee8749d15 in ProcShmDispatch (client=0x7f1eea0b5470) at ../../Xext/shm.c:1131 #8 0x00007f1ee86ae8a1 in Dispatch () at ../../dix/dispatch.c:442 #9 0x00007f1ee869d7ba in main (argc=8, argv=, envp=) at ../../dix/main.c:287 (gdb)