Can someone explain to me the apparent contradiction in the following two 
pieces of information ? 

From the serialization section of SYS1.MACLIB(IHARB):
If the task is not running and the local lock is held, the RB chain will not 
change. 
 
From APAR PQ81630:
PQ76702 introduced code for MVSTCB TCB statistics. DFHDSMT calls
DFHDSAUT for these statistics in routine CREATE_SNAPSHOT.
DFHDSAUT will loop in routine TCB_SCAN due to not serializing
the RB chain. A MVS local lock is not enough to serialize the
RB chain.

Thanks in advance, Mark.

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