I tried breaking stone, dirt, and glass, using a enchanted diamond pickaxe and then an enchanted diamond sword. The game crashes just after the first cracks appear.
What I expected to happen was...:
block breaks
What actually happened was...:
game breaks
Steps to Reproduce:
I connected to server. I can walk around, open chests, etc. but when I try to break a block, crash.
Related issues
Comments

Duplicate of MC-47427
Linux x64 OpenJDK/Oracle Java 7u51, same thing happens.
Only on dedicated servers, integrated server SP games do not crash.