When I ran /fill ~ ~-1 ~ ~100 ~-1 ~100 minecraft:prismarine I Timed Out of the server and the server crashed with the attached report
MC-63668
Server Crash when using /fill
Resolved
Duplicate
0
Toby Strong
(Unassigned)
Unconfirmed
Minecraft 14w30c
Retrieved
This worked fine on my local hosted server. Maybe the server ran out of ram.