(gdb) bt
#0  0x00007fa3d8f0b475 in *__GI_raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007fa3d8f0e6f0 in *__GI_abort () at abort.c:92
#2  0x000000000076d6ac in errfinish (dummy=dummy@entry=0) at elog.c:546
#3  0x000000000076fdca in elog_finish (elevel=elevel@entry=22, fmt=fmt@entry=0x7d2aa7 "invalid xlog record length %u") at elog.c:1304
#4  0x00000000004e1eba in XLogInsert (rmid=rmid@entry=17 '\021', info=info@entry=48 '0', rdata=rdata@entry=0x7ffff162fc40) at xlog.c:966
#5  0x00000000004a9bb9 in mmSetHeapBlockItemptr (rmAccess=rmAccess@entry=0x16729a0, heapBlk=heapBlk@entry=0, blkno=blkno@entry=1, offno=offno@entry=1)
    at mmrevmap.c:169
#6  0x00000000004a73e8 in mm_doinsert (idxrel=0x7fa3d974d7d8, rmAccess=0x16729a0, buffer=buffer@entry=0x1666754, heapblkno=0, tup=tup@entry=0x1672068, itemsz=16)
    at minmax.c:1410
#7  0x00000000004a7b85 in mmbuildCallback (index=index@entry=0x7fa3d974d7d8, htup=htup@entry=0x1671a40, values=values@entry=0x7ffff162fe30, 
    isnull=isnull@entry=0x7ffff162fe10 "", tupleIsAlive=tupleIsAlive@entry=1 '\001', state=state@entry=0x1666748) at minmax.c:595
#8  0x00000000004f8216 in IndexBuildHeapRangeScan (heapRelation=heapRelation@entry=0x7fa3d974bc60, indexRelation=indexRelation@entry=0x7fa3d974d7d8, 
    indexInfo=indexInfo@entry=0x166eb08, allow_sync=allow_sync@entry=0 '\000', start_blockno=start_blockno@entry=0, numblocks=numblocks@entry=4294967295, 
    callback=callback@entry=0x4a78d0 <mmbuildCallback>, callback_state=callback_state@entry=0x1666748) at index.c:2497
#9  0x00000000004f860e in IndexBuildHeapScan (heapRelation=heapRelation@entry=0x7fa3d974bc60, indexRelation=indexRelation@entry=0x7fa3d974d7d8, 
    indexInfo=indexInfo@entry=0x166eb08, allow_sync=allow_sync@entry=0 '\000', callback=callback@entry=0x4a78d0 <mmbuildCallback>, 
    callback_state=callback_state@entry=0x1666748) at index.c:2119
#10 0x00000000004a89b5 in mmbuild (fcinfo=<optimized out>) at minmax.c:830
#11 0x0000000000774158 in OidFunctionCall3Coll (functionId=functionId@entry=3185, collation=collation@entry=0, arg1=arg1@entry=140341704703072, 
    arg2=arg2@entry=140341704710104, arg3=arg3@entry=23522056) at fmgr.c:1652
#12 0x00000000004f6966 in index_build (heapRelation=heapRelation@entry=0x7fa3d974bc60, indexRelation=indexRelation@entry=0x7fa3d974d7d8, 
    indexInfo=indexInfo@entry=0x166eb08, isprimary=isprimary@entry=0 '\000', isreindex=isreindex@entry=0 '\000') at index.c:1982
#13 0x00000000004f79e0 in index_create (heapRelation=heapRelation@entry=0x7fa3d974bc60, indexRelationName=indexRelationName@entry=0x1642fe0 "idx_t1_i", 
    indexRelationId=40963, indexRelationId@entry=0, relFileNode=0, indexInfo=indexInfo@entry=0x166eb08, indexColNames=indexColNames@entry=0x166e860, 
    accessMethodObjectId=accessMethodObjectId@entry=3847, tableSpaceId=tableSpaceId@entry=0, collationObjectId=collationObjectId@entry=0x1671e30, 
    classObjectId=classObjectId@entry=0x1671e50, coloptions=coloptions@entry=0x1671e70, reloptions=reloptions@entry=0, isprimary=0 '\000', isconstraint=0 '\000', 
    deferrable=0 '\000', initdeferred=0 '\000', allow_system_table_mods=0 '\000', skip_build=0 '\000', concurrent=0 '\000', is_internal=0 '\000') at index.c:1081
#14 0x00000000005797af in DefineIndex (stmt=0x1642f48, indexRelationId=indexRelationId@entry=0, is_alter_table=is_alter_table@entry=0 '\000', 
    check_rights=check_rights@entry=1 '\001', skip_build=skip_build@entry=0 '\000', quiet=quiet@entry=0 '\000') at indexcmds.c:595
#15 0x000000000069fe38 in ProcessUtilitySlow (parsetree=parsetree@entry=0x15def28, queryString=0x15de378 "create index idx_t1_i on t1 using minmax(i);", 
    context=<optimized out>, params=params@entry=0x0, completionTag=0x7ffff1630e80 "", dest=<error reading variable: Unhandled dwarf expression opcode 0xfa>)
    at utility.c:1162
#16 0x000000000069f07c in standard_ProcessUtility (parsetree=0x15def28, queryString=<optimized out>, context=<optimized out>, params=0x0, dest=<optimized out>, 
    completionTag=<optimized out>) at utility.c:872
#17 0x000000000069c587 in PortalRunUtility (portal=0x16684e8, utilityStmt=0x15def28, isTopLevel=1 '\001', dest=0x15df310, completionTag=0x7ffff1630e80 "")
    at pquery.c:1187
#18 0x000000000069d299 in PortalRunMulti (portal=portal@entry=0x16684e8, isTopLevel=isTopLevel@entry=1 '\001', dest=dest@entry=0x15df310, 
    altdest=altdest@entry=0x15df310, completionTag=completionTag@entry=0x7ffff1630e80 "") at pquery.c:1318
#19 0x000000000069df32 in PortalRun (portal=portal@entry=0x16684e8, count=count@entry=9223372036854775807, isTopLevel=isTopLevel@entry=1 '\001', 
    dest=dest@entry=0x15df310, altdest=altdest@entry=0x15df310, completionTag=completionTag@entry=0x7ffff1630e80 "") at pquery.c:816
#20 0x000000000069afdb in exec_simple_query (query_string=0x15de378 "create index idx_t1_i on t1 using minmax(i);") at postgres.c:1048
#21 PostgresMain (argc=<optimized out>, argv=argv@entry=0x15c6e08, dbname=0x15c6c68 "postgres", username=<optimized out>) at postgres.c:3992
#22 0x000000000046559e in BackendRun (port=0x15e5740) at postmaster.c:4083
#23 BackendStartup (port=0x15e5740) at postmaster.c:3772
#24 ServerLoop () at postmaster.c:1583
#25 0x000000000065230e in PostmasterMain (argc=argc@entry=3, argv=argv@entry=0x15c2ee0) at postmaster.c:1239
#26 0x0000000000465ec5 in main (argc=3, argv=0x15c2ee0) at main.c:196