postgresql infinite loop

#0  UnpinBuffer (buf=0x7fb47d11bdf8, fixOwner=<optimized out>) at bufmgr.c:1201

#1  0x000000000063947d in ReleaseAndReadBuffer (buffer=buffer@entry=2463, relation=relation@entry=0x7fb47cc58f98, blockNum=423) at bufmgr.c:1089

#2  0x0000000000482b6f in _bt_relandgetbuf (rel=rel@entry=0x7fb47cc58f98, obuf=obuf@entry=2463, blkno=<optimized out>, access=access@entry=1) at nbtpage.c:639

#3  0x00000000004863d8 in _bt_moveright (rel=rel@entry=0x7fb47cc58f98, buf=2463, keysz=keysz@entry=1, scankey=scankey@entry=0x178a350, nextkey=nextkey@entry=0 '\000', access=access@entry=1)

    at nbtsearch.c:194

#4  0x000000000048669f in _bt_search (rel=rel@entry=0x7fb47cc58f98, keysz=keysz@entry=1, scankey=scankey@entry=0x178a350, nextkey=nextkey@entry=0 '\000', bufP=bufP@entry=0x7fff0e5f8064,

    access=access@entry=2) at nbtsearch.c:86

#5  0x000000000048249f in _bt_doinsert (rel=rel@entry=0x7fb47cc58f98, itup=itup@entry=0x1788200, checkUnique=checkUnique@entry=UNIQUE_CHECK_YES, heapRel=heapRel@entry=0x7fb47cc581d8)

    at nbtinsert.c:118

#6  0x000000000048520d in btinsert (fcinfo=<optimized out>) at nbtree.c:257

#7  0x0000000000728cfa in FunctionCall6Coll (flinfo=flinfo@entry=0x1758040, collation=collation@entry=0, arg1=arg1@entry=140413164162968, arg2=arg2@entry=140733434529104,

    arg3=arg3@entry=140733434529360, arg4=arg4@entry=24658596, arg5=arg5@entry=140413164159448, arg6=1) at fmgr.c:1440

#8  0x000000000047f109 in index_insert (indexRelation=indexRelation@entry=0x7fb47cc58f98, values=values@entry=0x7fff0e5f8550, isnull=isnull@entry=0x7fff0e5f8650 "",

    heap_t_ctid=heap_t_ctid@entry=0x17842a4, heapRelation=heapRelation@entry=0x7fb47cc581d8, checkUnique=checkUnique@entry=UNIQUE_CHECK_YES) at indexam.c:216

#9  0x000000000058db1d in ExecInsertIndexTuples (slot=slot@entry=0x1751b30, tupleid=tupleid@entry=0x17842a4, estate=estate@entry=0x1750fc0) at execUtils.c:1089

#10 0x000000000059adc7 in ExecInsert (canSetTag=1 '\001', estate=0x1750fc0, planSlot=0x1751b30, slot=0x1751b30) at nodeModifyTable.c:248

#11 ExecModifyTable (node=node@entry=0x17511e0) at nodeModifyTable.c:854

#12 0x0000000000584478 in ExecProcNode (node=node@entry=0x17511e0) at execProcnode.c:376

#13 0x0000000000581c40 in ExecutePlan (dest=0x176f238, direction=<optimized out>, numberTuples=0, sendTuples=0 '\000', operation=CMD_INSERT, planstate=0x17511e0, estate=0x1750fc0) at execMain.c:1411

#14 standard_ExecutorRun (queryDesc=0x1758850, direction=<optimized out>, count=0) at execMain.c:315

#15 0x000000000065e3ae in ProcessQuery (plan=<optimized out>,

    sourceText=0x177ba80 "INSERT INTO token (id, expires, extra, valid, user_id, trust_id) VALUES ('d810c3f542414cfa86778249be70ab93', '2016-09-26T06:32:46.097976'::timestamp, '{\"token_data\": {\"token\": {\"methods\": [\"password\"]"..., params=0x0, dest=0x176f238, completionTag=0x7fff0e5f8c80 "") at pquery.c:185

#16 0x000000000065e5dd in PortalRunMulti (portal=portal@entry=0x1638380, isTopLevel=isTopLevel@entry=1 '\001', dest=dest@entry=0x176f238, altdest=altdest@entry=0x176f238,

    completionTag=completionTag@entry=0x7fff0e5f8c80 "") at pquery.c:1275

#17 0x000000000065f1a8 in PortalRun (portal=0x1638380, count=9223372036854775807, isTopLevel=<optimized out>, dest=0x176f238, altdest=0x176f238, completionTag=0x7fff0e5f8c80 "") at pquery.c:812

#18 0x000000000065b100 in PostgresMain (argc=<optimized out>, argv=<optimized out>, dbname=<optimized out>, username=<optimized out>) at postgres.c:1073

#19 0x00000000006182c6 in BackendRun (port=0x163e9a0) at postmaster.c:3813

#20 BackendStartup (port=0x163e9a0) at postmaster.c:3484

#21 ServerLoop () at postmaster.c:1497

#22 0x0000000000619077 in PostmasterMain (argc=argc@entry=1, argv=argv@entry=0x1616690) at postmaster.c:1226

#23 0x000000000045bb45 in main (argc=1, argv=0x1616690) at main.c:230