Core was generated by `postgres: autovacuum worker process   archie              '.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f133b635045 in raise () from /lib64/libc.so.6
(gdb) bt
#0  0x00007f133b635045 in raise () from /lib64/libc.so.6
#1  0x00007f133b6364ea in abort () from /lib64/libc.so.6
#2  0x00000000007dc007 in ExceptionalCondition (conditionName=conditionName@entry=0x81a088 "!(((PageHeader) (page))->pd_special >= (__builtin_offsetof (PageHeaderData, pd_linp)))", 
    errorType=errorType@entry=0x81998b "FailedAssertion", fileName=fileName@entry=0x83480a "ginfast.c", lineNumber=lineNumber@entry=537) at assert.c:54
#3  0x00000000004894aa in shiftList (stats=0x0, fill_fsm=1 '\001', newHead=26357, metabuffer=130744, index=0x7f133c0f7518) at ginfast.c:537
#4  ginInsertCleanup (ginstate=ginstate@entry=0x7ffd98ac9160, vac_delay=vac_delay@entry=1 '\001', fill_fsm=fill_fsm@entry=1 '\001', stats=stats@entry=0x0) at ginfast.c:908
#5  0x00000000004874f7 in ginvacuumcleanup (fcinfo=<optimized out>) at ginvacuum.c:662
#6  0x00000000007e39ef in FunctionCall2Coll (flinfo=flinfo@entry=0x7ffd98acbb20, collation=collation@entry=0, arg1=arg1@entry=140727164910976, arg2=arg2@entry=0) at fmgr.c:1323
#7  0x00000000004b6758 in index_vacuum_cleanup (info=info@entry=0x7ffd98acbd80, stats=stats@entry=0x0) at indexam.c:717
#8  0x0000000000574909 in do_analyze_rel (onerel=onerel@entry=0x7f133c0e2820, options=options@entry=98, va_cols=va_cols@entry=0x0, acquirefunc=0x40f8928000000000, relpages=82810, 
    inh=inh@entry=0 '\000', in_outer_xact=in_outer_xact@entry=0 '\000', elevel=elevel@entry=13, params=<optimized out>) at analyze.c:628
#9  0x00000000005758f3 in analyze_rel (relid=relid@entry=5350190, relation=relation@entry=0x7ffd98acc120, options=options@entry=98, params=params@entry=0x20aabd0, 
    va_cols=va_cols@entry=0x0, in_outer_xact=0 '\000', bstrategy=0x20aac60) at analyze.c:257
#10 0x00000000005d1c3d in vacuum (options=98, relation=relation@entry=0x7ffd98acc120, relid=<optimized out>, params=0x20aabd0, params@entry=0xe, va_cols=va_cols@entry=0x0, 
    bstrategy=<optimized out>, bstrategy@entry=0x20aac60, isTopLevel=isTopLevel@entry=1 '\001') at vacuum.c:313
#11 0x000000000067e400 in autovacuum_do_vac_analyze (bstrategy=0x20aac60, tab=0x6) at autovacuum.c:2807
#12 do_autovacuum () at autovacuum.c:2328
#13 0x000000000067e8fa in AutoVacWorkerMain (argv=0x0, argc=0) at autovacuum.c:1647
#14 0x000000000067e9b2 in StartAutoVacWorker () at autovacuum.c:1454
#15 0x000000000068bd40 in StartAutovacuumWorker () at postmaster.c:5289
#16 sigusr1_handler (postgres_signal_arg=<optimized out>) at postmaster.c:4973
#17 <signal handler called>
#18 0x00007f133b6e2573 in select () from /lib64/libc.so.6
#19 0x0000000000465945 in ServerLoop () at postmaster.c:1648
#20 0x000000000068ce1a in PostmasterMain (argc=argc@entry=3, argv=argv@entry=0x1febc70) at postmaster.c:1292
#21 0x0000000000466d4f in main (argc=3, argv=0x1febc70) at main.c:223