This is a head-up so no one else spends a lot of time needlessly:

This check tripped on all systems in the production sysplex (together with the 
RACF sensitive resources one). Then both conditions cleared themselves 
magically on all systems all by themselves, and since we didn't have the 
history log stream, it took three sysprogs all day NOT to find anything wrong 
with any linklist dataset.

Finally I found a RACF apar that says whenever there is an exclusive enq on any 
dataset so that the checks cannot get at it, then the exception is triggered. 
For RACF, this is fixed in oa21267.

Note that the apar text makes it sound (to me) like the ENQ must be actually 
held. Well, it doesn't, and the newextents check does the same thing: Just 
submitting an iefbr14 batch job with a dd statement with disp=old on any lnklst 
dataset (that batch job goes into a wait and doesn't get the ENQ) and then 
refreshing the check triggers the check that says that the linklist went into 
extents.

Actually, what SDSF shows is this:

TOTAL EXTENTS ORIG: 75    CURR: 74

So from the orginal 75 extents we're down to 74 (accessible) extents, and of 
course that means that the linklist went into extents!

The CK panel correctly states "information could not be obtained for data set", 
but that doesn't prevent the high severity exception.

Regards, Barbara

ps: The batch job that erroneously had the disp=old doesn't normally run....
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