As far as I can see you are running on very low memory environment. 1gb ram, 4gb swap is kinda pain. I tried to reproduce this using my docker images based on Ubuntu 16.04. And it passed.
However, resync process took about 3 hours and 20 mins :(
Which version of gcc did you use to compile your wallet? Mine is 5.4.0
RE: Steem Mining - Ubuntu 14.04