PROBLEM:  (QAR 69251)    (Patch ID: OSF440-054)
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In the latest development version (version 52), Ladebug has has begun to
employ a "user thread hold" mechanism.  The initial testing of this mechanism
has revealed bugs in DECthreads code bases which might result in missed
breakpoints and watchpoints, as well as causing application hangs.

PROBLEM:  (CLD HPAQ21HQ9)    (Patch ID: OSF440-054)
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Customer was encountering an invalid scheduling priority bugcheck, which
appears to be caused by incorrect referencing of scheduling data structures
inside DECthreads.

PROBLEM:  (QAR 69364)    (Patch ID: OSF440-054)
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The manager thread is being scheduled to run in response to a system event
(nxm action, timer queue expiration, etc) but is not recognizing the event
as the reason it was scheduled to run.
  
The manager thread then goes back to sleep, only to wake up again in response
to the still unserviced system event.  An infinite loop results.