Also get this reported in the scan reports when scanning. Not sure if it's related or not.

Screenshot from 2020-07-14 15-45-56.png (138,712 bytes)   

Screenshot from 2020-07-14 15-45-56.png (138,712 bytes)   

[ 999.328300] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/greenbone-security-assistant.service,task=gsad,pid=3690,uid=0
[ 999.328318] Out of memory: Killed process 3690 (gsad) total-vm:20077760kB, anon-rss:13348140kB, file-rss:0kB, shmem-rss:0kB, UID:0 pgtables:38704kB oom_score_adj:0
[ 999.636074] oom_reaper: reaped process 3690 (gsad), now anon-rss:16kB, file-rss:0kB, shmem-rss:0kB

Thanks for your report.
Since your bug report we have updated all the Openvas packages: main package has been renamed gvm
and we have greenbone-security-assistant version 9.0.1-0kali4.
If you haven't done yet, you should install gvm and read carefully the documentation (in /usr/share/doc/gvm) about
the migration and the gvm usage.