PROBLEM:  (MGO104104)    (Patch ID: OSF425-620)
********
This patch fixes a system panic with panic string:
    "simple_lock: time limit exceeded"

An example stack trace whould be:

   panic                src/kernel/bsd/subr_prf.c : 796
   simple_lock_fault    src/kernel/kern/lock.c : 2386
   simple_lock_time_violation  src/kernel/kern/lock.c : 2435
   lock_done            src/kernel/kern/lock.c : 749
   mpsleep              src/kernel/bsd/kern_synch.c : 511
   kds_getdb            src/kernel/io/common/kds.c : 645
   kds_addds_lock       src/kernel/io/common/kds.c : 1601
   kds_addds            src/kernel/io/common/kds.c : 1583
   add_device_persistance  src/kernel/io/common/cma_dd.c : 1476
   conn_device          src/kernel/io/common/driver_support.c : 1030
   optical_online       usr/opt/CLC310/op/cam_optical.c : 1111
   optical_open         usr/opt/CLC310/op/cam_optical.c : 958
   spec_open            src/kernel/vfs/spec_vnops.c : 1433
   vn_open              src/kernel/vfs/vfs_vnops.c : 652
   copen                src/kernel/vfs/vfs_syscalls.c : 2398
   open                 src/kernel/vfs/vfs_syscalls.c : 2325
   syscall              src/kernel/arch/alpha/syscall_trap.c : 627
   _Xsyscall            src/kernel/arch/alpha/locore.s : 1409