after server crashes we see copying chunks. See screens for more details.
In logs I see
[09:44:59] [Server Watchdog/FATAL]: A single server tick took 60,28 seconds (should be max 0,05)
[09:44:59] [Server Watchdog/FATAL]: Considering it to be crashed, server will forcibly shutdown.
[09:44:59] [Server Watchdog/ERROR]: This crash report has been saved to: D:\Minecraft Game\server\.\crash-reports\crash-2015-12-01_09.44.59-server.txt

link to world https://drive.google.com/file/d/0B1qHfHdgPjJpWnljbHVTRXl4dUE/view?usp=sharing