I've been doing some playing around lately with the kernel and crash
  dumps.  I have gotten the scsi disk to do a crash dump, savecore to
  read in the crashdump from the scsi disk's swap partition and save
  it as a file in /var/crash(the other file put the is the kernel itself).

  I'm now trying to run gdb on it(actually kgdb).  So far I've gotten
  kgdb to recognize the crash file and find/print out the panic
  string that caused the kernel to crash.  

  I'm having a problem getting any farther.  Gdb can't seem to find the 
  registers.  It can find curproc, but all elements in curproc are
  just 0, none of them contains data.  Does anyone have a working gdb
  for kernel?  I saw the compiler option in  the GENERIC makefile, but
  is there nothing that can use it?

  FreeBSD has a kgdb, which is an old version of gdb.  I've tried compiling
  the new gdb but that couldn't even debug regular programs.