I am having repeated and frequent crashes ending session whenever I take certain actions such as loading gmail under Chrome. Oddly, the same is not happening when I go to gmail under Chrome. After rooting around in /var/logs it appears to me that he trigger is something to do with libc.so.6 (see below). How can I fix this?

 23936.947] 
    [ 23936.947] Backtrace:
    [ 23936.948] 0: /usr/bin/X (xorg_backtrace+0x49) [0xb7745089]
    [ 23936.948] 1: /usr/bin/X (0xb75bf000+0x189d7a) [0xb7748d7a]
    [ 23936.948] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb759c40c]
    [ 23936.948] 3: /usr/bin/X (0xb75bf000+0xfade7) [0xb76b9de7]
    [ 23936.948] 4: /usr/bin/X (ValidatePicture+0x1d) [0xb76bcb8d]
    [ 23936.949] 5: /usr/bin/X (CompositePicture+0xc3) [0xb76bcc83]
    [ 23936.949] 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb6f18000+0xcf542) [0xb6fe7542]
    [ 23936.949] 7: /usr/bin/X (0xb75bf000+0x10b1d7) [0xb76ca1d7]
    [ 23936.949] 8: /usr/bin/X (CompositeGlyphs+0xc4) [0xb76b6d84]
    [ 23936.949] 9: /usr/bin/X (0xb75bf000+0x104956) [0xb76c3956]
    [ 23936.949] 10: /usr/bin/X (0xb75bf000+0xfe6f1) [0xb76bd6f1]
    [ 23936.949] 11: /usr/bin/X (0xb75bf000+0x3798d) [0xb75f698d]
    [ 23936.949] 12: /usr/bin/X (0xb75bf000+0x253ba) [0xb75e43ba]
    **[ 23936.950] 13: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0xb721d4d3]
    [ 23936.950] 14: /usr/bin/X (0xb75bf000+0x256f9) [0xb75e46f9]
    [ 23936.950] 
    [ 23936.950] Segmentation fault at address 0x155
    [ 23936.950] 
    Caught signal 11 (Segmentation fault). Server aborting
    [ 23936.950] 
    Please consult the The X.Org Fou**ndation support 
         at http://wiki.x.org
     for help. 
    [ 23936.950] Please also check the log file at "/var/log/Xorg.0.log" for additional information.