Does your machine have 4GB or less of RAM? If you have more, it may be much 
less likely to trigger. I just verified that when I log into GNOME on the 
machine in question, an rsync of a single large file that never works when done 
remotely works fine, it only fails when attempted from a non-DE login (ssh or 
console). This should be easy to reproduce with a VM with 1 or 2 GB of RAM (I 
don't know what the current minimum is). I have a F38 VM that I normally 
allocate 2GB and boot in multiuser, just to update. I was starting to notice 
the problem in that as well, so at first I increased the RAM to 4GB and didn't 
notice it anymore. I don't know why the VM requires less RAM than the F37 bare 
metal machine. Anyway, once I suspected that the problem was with the non-DE 
login, I lowered the allocation to 2GB and booted in graphical, and logged into 
GNOME, and the problem was gone. I don't like doing that, though, since the 
updating takes longer with all the nonessential stuff going on in GNOME
  (which is why I normally use multiuser). The VM is running on a different 
host with 16GB so I doubt this has anything to do with hardware issues.

I did try "systemctl mask systemd-oomd" yesterday, but then discovered that if 
I reinstall systemd-oomd-defaults, it starts running again, even though it's 
still masked, so that's not reliable. The same thing would probably happen on 
any systemd update, unless I just removed systemd-oomd-defaults itself.
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