I am running a 100% vanilla 1.5.1 server. I get - as soon as someone joins - tons of these here:

java.io.IOException: Input/output error
    at java.io.RandomAccessFile.write(Native Method)
    at java.io.RandomAccessFile.writeInt(Unknown Source)
    at acg.a(SourceFile:307)
    at acg.a(SourceFile:249)
    at ach.close(SourceFile:230)
    at java.util.zip.DeflaterOutputStream.close(Unknown Source)
    at java.io.FilterOutputStream.close(Unknown Source)
    at acj.a(SourceFile:137)
    at acj.c(SourceFile:125)
    at akv.b(SourceFile:29)
    at akv.run(SourceFile:22)
    at java.lang.Thread.run(Unknown Source)

There is enough space on the harddisk, so that cannot be the issue. Any idea what could be wrong?

  • Does the server crash, do something else unwanted, or is everything working and these are just harmlessly spamming the console output? I've deobfuscated the trace using MCP's class/function names, and it seems to be a problem writing Region files, but that doesn't tell me much unless I know what else is happening when this exception gets thrown. – SevenSidedDie Mar 28 '13 at 18:49
  • It seems to lag the server. I am also worried that my region files might be corrupted. – uncovery Mar 28 '13 at 21:49
  • @SevenSidedDie I generated a new map and the problem seems to be gone. It must have corrupted the map somewhere. – uncovery Mar 30 '13 at 10:17

Follow these steps to fix your issue:

  • Go to your minecraft server file
  • Right click and open with winrar
  • Go to the .gar
  • Double click the ip data drive on the qb.k file
  • > Double click the ip data drive on the qb.k file ?? I am on a linux console, I know how to open this file, but the last line confused me. – uncovery Mar 28 '13 at 14:18
  • 2
    @uncovery It's confusing because it's gibberish. – SevenSidedDie Mar 28 '13 at 17:20

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