- Update to 4.0.9
  o New mainline versioning
  o Wholesale replacement of the x86/x86_64 disassembly code in the
    embedded gdb-6.1 module to that used in gdb-6.8 to correctly decode
    the 5-byte NOP used by the function tracer
  o Fix compressed diskdump/kdump vmcores to properly handle page
    descriptor structures that are located beyond a 4GB file offset
    in the vmcore file
  o Fix the "sym <address>" command option when the address references
    a symbol in the vsyscall FIXMAP virtual address page in certain
    x86_64 kernel versions
  o Multiple fixes for the "bt" command on x86_64:
    - properly recognize vsyscall FIXMAP virtual addresses when
      encountered as the RIP in an exception frame.
    - always use the NMI exception stack when available, not the per-cpu
      IRQ stack of an active non-crashing task
    - correctly determine the frame just above an IRQ interrupt exception
      frame, or above an exception frame that gets handled on the process
      stack, such as a page fault
    - correctly calculate the frame size to differentiate between text
      return addresses and the precise text RIP address of an exception
  o Fix usage of a System.map file argument with 2.6.30 and later kernels
    to avoid "crash: symbol count overflow (trace_kmalloc)" messages
  o Fix usage of a System.map file argument whose symbol list does not
    contain an "_end" symbol.
  o Fix "kmem -p <address>" or "kmem <address>" when <address> is not
    a page structure address to avoid the annoying "kmem: WARNING:
    sparsemem: invalid section number: 8192" messages
  o Fix the snap.so extension module when run on pre-2.6.31 x86_64
    kernels with more than 4GB of physical memory
  o Fix build of the snap.so extension module on older systems
    running with "make" versions 3.80 or earlier
  o Fix build of the sial.so extension module if /usr/bin/bison
    and /usr/bin/flex do not exist on the host build system
  o Fix for the "rd" and "vtop" commands on RHEL4 x86_64 Xen paravirtual
    kernels in the reading or translation of vmalloc addresses that are 
    not in kernel module vmalloc address space
  o New command line option "-x" to automatically load extension modules

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