Same issue here but with BitTorrent Sync 2.3.6 (378) running on a BeagleBone White under Linux BeagleBoneWhite 3.8.13-bone79.
[ 428.033327] Out of memory: Kill process 942 (btsync) score 579 or sacrifice child
[ 428.041226] Killed process 942 (btsync) total-vm:234080kB, anon-rss:150724kB, file-rss:500kB
Sync crashes when I launch the web GUI.
Under /.sync, one .db file weights 1172480 and one .db-wal 1032312. Files in the /.sync directory are to big to be attached.
I've opened a ticket as suggested.