- Workaround for pre-2.6.17 kernels whose vmlinux file does not
  contain debug information for the "pid_hash" array.  Without this
  patch, the crash session would fail during initialization with the
  error message: "crash: cannot determine pid_hash array dimensions".
  This problem appears to be limited to kernels built with gcc
  version 4.0.0, which had a known regression that omitted debug
  information for uninitialized variables.  (anderson(a)redhat.com)
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http://people.redhat.com/anderson