Minecraft Version: 1.10
Operating System: Windows Server 2012 (amd64) version 6.2
Java Version: 1.8.0_73, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 7707101968 bytes (7350 MB) / 10737418240 bytes (10240 MB) up to 10737418240 bytes (10240 MB)
JVM Flags: 13 total; -Xms10G -Xmx10G -XX:+UseG1GC -XX:+UnlockExperimentalVMOptions -XX:MaxGCPauseMillis=100 -XX:+DisableExplicitGC -XX:TargetSurvivorRatio=90 -XX:G1NewSizePercent=50 -XX:G1MaxNewSizePercent=80 -XX:InitiatingHeapOccupancyPercent=10 -XX:G1MixedGCLiveThresholdPercent=50 -XX:+AggressiveOpts -XX:+AlwaysPreTouch

Related: https://hub.spigotmc.org/jira/browse/SPIGOT-2394

Not sure if there's an easier way to link other issues.

Should set the priority as critical, server is crashing a lot when other user came and put magma blocks to his natural-mob-spawner, where are bunch of entities are falling down.
Though, as i understand the reason not only magma blocks, but maybe fire_damage (crash with "bat" from lava and iron golem from lava). There are also "tick

Here are more crash reports, if it'll help crash-2016-06-11_11.26.29-server.txt crash-2016-06-11_15.15.18-server.txt crash-2016-06-11_15.34.54-server.txt

Can also confirm with same spigot version (git-Spigot-6016ac7-d5ecbd0)

Randomly crashed when someone was near a pig farm.

http://pastebin.com/3XuL8A7z

java.lang.IllegalStateException: Unhandled damage of EntityPig['Pig'/4120, l='Zero', x=373.05, y=83.54, z=311.09] by CraftBlock{chunk=CraftChunk

,x=2638,y=71,z=-1675,type=CACTUS,data=0} from inFire

Seems like a block is passed, but the DamageSource isn't from the same block, resulting in an illegal state. (Or something along those lines, not too proficient with the way spigot/bukkit handles things internally).

Can confirm this issue with the same Spigot version ( git-Spigot-6016ac7-d5ecbd0 ).

Faced it when was just jumping around a spawn wearing elytra (we have Residence protection there with "damage" turned off, so there were no possible "damage", and the fly was to short), so it caused me to fly a little and then kicked from the server, but there were no server crash (Here is console output of that moment: http://pastebin.com/y4hXx9gn).

Later i was afk-ing, and when returned to the computer noticed that server had a restart (shouldn't have it ), here are crash reports:
crash-2016-06-11_07.07.32-server.txt
crash-2016-06-11_07.16.30-server.txt

There is a golem farm, where i was standing, and now i'm standing there again and golems are dying without errors.