PROBLEM:  (TKTB59128, QAR 53741)    (Patch ID: OSF425-405377)
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The system can panic with "kernel memory fault."  This is a timing-related
panic.  The following is a typical panic trace:
>  0 boot() 
   1 panic(... = "kernel memory fault") 
   2 trap() 
   3 _XentMM()
   4 simple_lock_B() 
   5 pgrp_ref() 
   6 exit()
   7 rexit() 
   8 syscall()
 9 _Xsyscall()