after launched some tasks, on openvassd.log i got:
sd main:MESSAGE:2019-03-01 12h08.08 utc:32139: Finished testing 192.x.x.5. Time : 456.60 secs
sd main:MESSAGE:2019-03-01 12h08.38 utc:32151: Finished testing 193.x.x.2. Time : 486.02 secs
lib misc:MESSAGE:2019-03-01 12h12.28 utc:20944: Function (null) called from httpd_boa.nasl: Severe bug! Unhandled transport layer -1 (fd=1000000).
lib misc:MESSAGE:2019-03-01 12h12.29 utc:20944: Function http_recv_headers2 called from httpd_boa.nasl: Severe bug! Unhandled transport layer -1 (fd=1000000).
lib misc:MESSAGE:2019-03-01 12h12.29 utc:20944: Function (null) called from httpd_boa.nasl: Severe
There was an issue in the mentioned httpd_boa.nasl VT where a TCP socket was closed within a loop and where the VT was trying to send additional data afterwards (to the already closed socket). The VT has been fixed and should arrive in the Feed soon.
The seen SIGSEGV was unrelated and i have removed it from your initial post to avoid that different issues are mixed within one single thread.
Please report the SIGSEGV problem directly to the team working on the scanning engine. The matching issue tracker for this component is https://github.com/greenbone/openvas-scanner/issues. Please make sure to fill out the whole template shown during the issue creation so all required infos are provided.