PROBLEM: (82590) (PATCH ID: OSF510-223)
********
This patch fixes a bug that would cause a panic due to a software error that 
removed some functionality in system security. 
The stack trace to identify this problem actually occured on a thread marked as 
idle:
      0 boot                 src/kernel/arch/alpha/machdep.c : 2767
      1 panic                src/kernel/bsd/subr_prf.c : 1255
      2 thread_block         src/kernel/kern/sched_prim.c : 2896
      3 thread_preempt       src/kernel/kern/sched_prim.c : 4908
      4 boot                 src/kernel/arch/alpha/machdep.c : 2694
      5 panic                src/kernel/bsd/subr_prf.c : 1334
      6 xcpu_panic_ipir      src/kernel/bsd/subr_prf.c : 1441
      7 cpu_ip_intr          src/kernel/arch/alpha/cpu.c : 1392
      8 _XentInt             src/kernel/arch/alpha/locore.s : 1591
      9 _OtsMove             src/kernel/arch/alpha/ots_move_alpha.s : 1847
     10 tu_receive_int       src/kernel/io/dec/netif/if_tu.c : 4883
     11 tuintr               src/kernel/io/dec/netif/if_tu.c : 4398
     12 intr_dispatch_post   src/kernel/arch/alpha/hal/shared_intr.c : 420
     13 _XentInt             src/kernel/arch/alpha/locore.s : 1566
     14 idle_thread          src/kernel/kern/sched_prim.c : 4316
The crash was caused by a missing return() statement in the security system
call.