If you add water above a ladder (2x2 or something) Minecraft will crash and generate a error report! The report is here as an attachment!
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The crash occured in ig4icd64.dll - that's a part of the (know crappy) Intel graphics driver.
Get an updated driver for your graphics card.
Resolving all JVM crashes in ig4icd64.dll to MC-14051 (possible solution there)
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