Tested with mpd-0.15.5 and 0.15.8. After add the zip use flag and restarting mpd, the process eats all the system memory. I didn't have now the zip responsible of the problem (sorry i cleaned the log files switching to syslog)... if someone could try with a music folder with a bunch of zip files inside, I'm quite confident that can reproduce the bug.
Created attachment 226799 [details] emerge --info
Please retry with 0.16.2 and if the problem persists, please report if it's caused by a specific zip file or by any.
No action for over a week, please reopen (and if possible link upstream bug), if the bug still exists in the latest ~arch version.