If setup some command blocks to update each other with /blockdata in a loop the LastOutput tag will also contain the previous LastOutput's of each block recursively. Growing to such size that the game quickly begins to lag. There should probably be a reasonable size cap on LastOutput.
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Sorry I didn't search hard enough and just discovered this is a duplicate. Although MC-49057 is listed as resolved and this definitely still active.
kumasasa
MC-49057 is running out of memory , this is about lag.
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Managed to make it crash tonight while specifically testing this. Used 4 command blocks with the commands:
/blockdata 1 65 1 {SuccessCount:0}
/blockdata 1 65 -1 {SuccessCount:0}
/blockdata -1 65 -1 {SuccessCount:0}
/blockdata 1 65 -1 {SuccessCount:0}
3 connected by repeaters with a torch off the 3rd feeding the 4th with redstone dust.
Edit: When reading that crash report noticed I hadn't updated java in awhile. Updated to 1.8.0_31 and crashed it again.
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Duplicate of MC-12949 – If you have not, please use the search function in the future, to see if your bug has already been submitted.
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