Similar to MC-114174 which was dropped. This is apparently Not repeatable and it has happened at apparently random intervals and Minecraft versions to me.
A big blocky column of stone appears one "morning" and won't go away as seen in the screenshot.
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This issue has been temporarily closed as Awaiting Response.
We do not have enough information to find the cause of this issue.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder]) here.
Once attached, the report will be reopened automatically.
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Are there any error or warning messages in the log, for example about chunk errors?