#0  VmemTracker_ReserveVmem (newlyRequestedBytes=32776)	at vmem_tracker.c:524
#1  0x0000000000da8712 in gp_malloc_internal (requested_size=32768) at memprot.c:445
#2  0x0000000000da879f in gp_malloc (sz=32768) at memprot.c:479
#1  0x0000000000da1afe in AllocSetAllocImpl (context=0x2e92fa8, size=160, isHeader=0 '\000') at aset.c:1360
#2  0x0000000000da2016 in AllocSetAlloc (context=0x2e92fa8, size=160) at aset.c:1451
#3  0x0000000000da475d in palloc (size=160) at mcxt.c:1274
#4  0x0000000000c1208b in CreateQueryDesc (plannedstmt=0x2dbd120, sourceText=0x2dbc8a2 "select n_nationkey from nation order by n_nationkey desc;", snapshot=0x2dc4828, crosscheck_snapshot=0x0, dest=0x17d1b60 <donothingDR>, params=0x0, instrument_options=0)
    at pquery.c:91
#5  0x0000000000c12dfb in PortalStart (portal=0x2dc64e8, params=0x0, eflags=0, snapshot=0x0, ddesc=0x2dbdeb0) at pquery.c:655
#6  0x0000000000c0b299 in exec_mpp_query
……