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<IDLE> connections and cpu consumption

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Hi:

 

PG v4.8.3 on Linux

 

I'm using "selcet procpid,current_query from pg_stat_activity" to monitor activity during times when "top" is showing many PG procs with very high cpu usage numbers (all cores at or above 90%).  Some of these are procs that map to PG connections with current_query = <IDLE>.

 

What scenarios could explain a process identified as IDLE consuming lots of CPU?

 

More clues... In parallel with these was a user that was making a series of insert/delete/update commands that fire off triggers that generate more DML recursively.  Some of the idles are "<IDLE> in transaction".

 

Thanks for any help !


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