https://bugs.winehq.org/show_bug.cgi?id=44015
--- Comment #25 from Nikolay Sivov bunglehead@gmail.com --- (In reply to Christoffer from comment #24)
(In reply to tgheretford from comment #23)
I too also have ttf-google-fonts-git installed.
I just uninstalled ttf-google-fonts-git and only have a few other fonts installed from normal repo, and steam works fine now.
This means current wine-git should probably work, see d19e34d8f072514cb903bda89767996ba078bae4. This should fix address space exhaustion. So please test with current wine, or wait for 3.20.