In addition here is a backtrace of the process while it hung again today:
(thanks to our SA Eric)
#0 0x000000396c8d4627 in semop () from /lib64/libc.so.6
#1 0x00000000005dc313 in PGSemaphoreLock ()
#2 0x0000000000616586 in LWLockAcquire ()
#3 0x00000000004a718c in ginHeapTupleFastInsert ()
#4 0x000000000049c808 in gininsert ()
#5 0x00000000006dd968 in FunctionCall6Coll ()
#6 0x0000000000474b07 in index_insert ()
#7 0x00000000005664c8 in ExecInsertIndexTuples ()
#8 0x0000000000511fa2 in DoCopy ()
#9 0x0000000000626f71 in standard_ProcessUtility ()
#10 0x0000000000624299 in PostgresMain ()
#11 0x0000000000625309 in CreateQueryDesc ()
#12 0x0000000000625d35 in PortalRun ()
#13 0x0000000000623262 in PostgresMain ()
#14 0x00000000005e7ae4 in ClosePostmasterPorts ()
#15 0x00000000005e8861 in PostmasterMain ()
#16 0x000000000058c5be in main ()
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