I was placing buckets of water at sky level in creative mode when the world crashed. Single player and other multiplayer servers are working fine. This is a private multiplayer server.
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Here is the crash file

Fixed in 1.9
Incomplete without a crash report from (
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
). Please attach it to this ticket so that we can diagnose your issue.