Server intermittently crashes with the following message on console:
[17:16:10] [Server Watchdog/FATAL]: A single server tick took 60.07 seconds (should be max 0.05)
[17:16:10] [Server Watchdog/FATAL]: Considering it to be crashed, server will forcibly shutdown.
[17:16:11] [Server Watchdog/ERROR]: This crash report has been saved to: /usr/local/minecraft-server2/./crash-reports/crash-2018-11-18_17.16.11-server.txt
[17:16:11] [Server Shutdown Thread/INFO]: Stopping server
[17:16:11] [Server Shutdown Thread/INFO]: Saving players
Restarting the server normally brings it back up without issue. Behavior was not seen on previous snapshot, however I only ran that for a few days before updating. This has happened twice so far, about 22 1/2 hours apart. Let me know if further logs or server access are needed.
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See MC-63590.

I've run 4 minecraft servers on this box for 2 years (3 release, one snapshot). It has 96GB RAM and 24 CPU threads (2x 6 cores x2 HT). I have never seen this issue before loading this snapshot, and none of the other servers are affected still - just the one server running this latest snapshot. Both times it crashed it only had 2 players on it. Do you really think the issue is environmental?