Comment # 46 on bug 1165351 from Thomas Blume

(In reply to Luis Chamberlain from comment #45)
> FWIW -- I upgraded to Tumbleweed 20200314 on the tuctuc system and the issue
> is still present. I had to upgrade to some other development work on the
> system.

I've tried on a qemu setup:

-->
g18:~ # cat /etc/os-release 
NAME="openSUSE Tumbleweed"
# VERSION="20200314"
ID="opensuse-tumbleweed"
ID_LIKE="opensuse suse"
VERSION_ID="20200314"
--<

with a way lower memory:

-->
g18:~ # free -m
              total        used        free      shared  buff/cache   available
Mem:           1977         162        1475           0         339        1659
Swap:          1281           0        1281
--<

and couldn't reproduce the issue:

-->
Control group /:
-.slice
������1021 bpfilter_umh
������user.slice 
��� ������user-0.slice 
��� ��� ������session-1.scope 
��� ��� ��� ������3023 sshd: root@pts/0
��� ��� ��� ������3048 -bash
��� ��� ��� ������4854 systemd-cgls
��� ��� ��� ������4855 less
��� ��� ������user@0.service ���
��� ���   ������init.scope 
��� ���     ������3029 /usr/lib/systemd/systemd --user
��� ���     ������3030 (sd-pam)
��� ������user-1000.slice 
���   ������user@1000.service ���
���   ��� ������init.scope 
���   ���   ������4610 /usr/lib/systemd/systemd --user
���   ���   ������4611 (sd-pam)
���   ������session-2.scope 
���     ������4592 sshd: tslokal [priv]
���     ������4617 sshd: tslokal@pts/1
���     ������4618 -bash
[...]
# ps -o pid,user,rss,vsz 4610
  PID USER       RSS    VSZ
 4610 tslokal  10400  16052
--<

You can see ps 4610 is consuming about 16MB, which is just fine for 2G of RAM.

Maybe it is bound to big memory machines?
Could you give it a try rebooting one of your machines with reducing the
physical memory size using the mem kernel parameter?