Memory leak in PrimProc is followed by restarting of MCS system in the occurrence of next memory processing on PM(s)

Memory leak in PrimProc is followed by restarting of MCS system in the occurrence of next memory processing on PM(s)

PrimProc process does not deliberate the used memory and it appears
subsequently to be killed by OS and MCS system to be restarted .

it's observed memory leak in the PrimProc process on PM(s) Nodes
after querying with the TPC-DS query set .
Finally after all queries are being finished PrimProc remained with more than 70% used memory .

The problem with restarting MCS appears when other more memory consuming processes
are running afterwards on PM(s)

For example :
Start parallel cpimport bulk data load of several columnstore tables – that's followed by columnstore restating, breaking the load and frequently by remained table locks after the columnstore recovering which is breaking additionally the load and needs manual clean up.
The same operation pass successfully if PrimProc was not get 72.0 %MEM before.

how to repeat :
load TPC-DS schema and 1TB data
run the TPC-DS power test with the supported by MCS query set.
after test is being finished successfully verify that the PrimProc on PM(s) did not returned memory

note: at appears that the ExeMgr on UM also gets more memory during some query processing --more than 50% , but it's returned back and finally test finished with 2-3% in ExeMgr

PM1

top - 02:02:15 up 2 days, 26 min,  0 users,  load average: 10.44, 6.97, 5.27

Tasks: 179 total,   1 running, 178 sleeping,   0 stopped,   0 zombie

%Cpu(s):  4.8 us,  3.2 sy,  0.0 ni, 92.1 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st

KiB Mem : 61849300 total, 16365836 free, 45155268 used,   328196 buff/cache

KiB Swap:  1048572 total,  1048572 free,        0 used. 16191216 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND

 1107 root      19  -1 44.104g 0.041t  12524 S   6.7 72.0 715:29.67 PrimProc

 1014 root      20   0 2617644  21232  11560 S   6.7  0.0  20:23.51 ProcMon

  999 root      20   0  461708  19076  15640 S   0.0  0.0   0:01.07 workernode

 1141 root      20   0 1181320  17724   8920 S   6.7  0.0  53:12.81 ProcMgr

  882 root      20   0  562396  16588   5904 S   0.0  0.0   0:18.88 tuned

 1123 root      20   0  429028  14292   9920 S   0.0  0.0   0:00.10 WriteEngin+

  641 polkitd   20   0  536236  14100   4632 S   0.0  0.0   0:00.55 polkitd

  919 root      20   0  896840  13596   8072 S   0.0  0.0   0:05.20 controller+

  956 root      20   0  380812  12436   8296 S   0.0  0.0   0:22.57 ServerMoni+

  467 root      20   0   45024  11088  10764 S   0.0  0.0   0:01.76 systemd-jo+